You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@flink.apache.org by KurtYoung <gi...@git.apache.org> on 2016/08/19 03:58:38 UTC
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
GitHub user KurtYoung opened a pull request:
https://github.com/apache/flink/pull/2388
[FLINK-4347][cluster management] Implement SlotManager core
Implement some SlotManager's logic mainly in 4 parts:
* handle slot request initiated by JobMaster
* sync slot status trigger by TaskExecutor's heartbeat
* handle slot request failed at TaskExecutor's side
* handle Resouce(Container) failure (either triggered by some timeout detector or cluster manager master. e.g. yarn master)
I'm not sure whether these logics been implemented too complex, since the local status are not always true due to the distributed environment. The principle i used is:
* Always trust TaskExecutor.
* Generate each action based on the incoming message type (actually, the interface been called) & current information i have. And update local information based on the incoming message.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/KurtYoung/flink jira-4347
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2388.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2388
----
commit d9a055983c3ff7a1c3049c9403c970cf21173061
Author: Kurt Young <yk...@gmail.com>
Date: 2016-08-18T07:48:30Z
[FLINK-4347][cluster management] Implement SlotManager core
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76821590
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceID.java ---
@@ -63,9 +63,7 @@ public final int hashCode() {
@Override
public String toString() {
- return "ResourceID{" +
- "resourceId='" + resourceId + '\'' +
- '}';
+ return resourceId;
--- End diff --
Why do you change the `toString()` method?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by StephanEwen <gi...@git.apache.org>.
Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2388
Looks quite good all in all.
Be good to get this in, so that JobManager followup work can build on this.
I would take this, rebase it, and merge it. If I find some issues I would create followup issues.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76819301
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,525 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
--- End diff --
Shouldn't the reference to the `SlotManager` instance be held by the `ResourceManager` which makes sync/async calls on it?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76821672
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/SlotID.java ---
@@ -75,9 +75,15 @@ public int hashCode() {
@Override
public String toString() {
- return "SlotID{" +
- "resourceId=" + resourceId +
- ", slotId=" + slotId +
- '}';
+ return resourceId + "_" + slotId;
--- End diff --
Why do you change the existing `toString()` method?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2388
Hi @KurtYoung! Let me also go over your changes and then merge this as part of the new ResourceManager.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76919953
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,525 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = checkNotNull(resourceManagerGateway);
+ this.registeredSlots = new HashMap<>(16);
+ this.pendingSlotRequests = new LinkedHashMap<>(16);
+ this.freeSlots = new HashMap<>(16);
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Cannot fulfil slot request, try to allocate a new container for it, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication (timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request has somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * Callback for TaskManager failures. In case that a TaskManager fails, we have to clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove != null) {
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if slot is empty.
+ * <p>
+ * Regarding 2: It will cause some weird situation since we may have some time-gap on how the slot's status really
+ * is. We may have some updates on the slot's allocation, but it doesn't reflected by TaskManager's heartbeat yet,
+ * and we may make some wrong decision if we cannot guarantee we have the exact status about all the slots. So
+ * the principle here is: We always trust TaskManager's heartbeat, we will correct our information based on that
+ * and take next action based on the diff between our information and heartbeat status.
+ *
+ * @param reportedStatus Reported slot status
+ */
+ void updateSlotStatus(final SlotStatus reportedStatus) {
+ final SlotID slotId = reportedStatus.getSlotID();
+ final ResourceSlot slot = new ResourceSlot(slotId, reportedStatus.getProfiler());
+
+ if (registerNewSlot(slot)) {
+ // we have a newly registered slot
+ LOG.info("New slot appeared, SlotID:{}, AllocationID:{}", slotId, reportedStatus.getAllocationID());
+
+ if (reportedStatus.getAllocationID() != null) {
+ // slot in use, record this in bookkeeping
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+ } else {
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ } else {
+ // slot exists, update current information
+ if (reportedStatus.getAllocationID() != null) {
+ // slot is reported in use
+ final AllocationID reportedAllocationId = reportedStatus.getAllocationID();
+
+ // check whether we also thought this slot is in use
+ if (allocationMap.isAllocated(slotId)) {
+ // we also think that slot is in use, check whether the AllocationID matches
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ if (!reportedAllocationId.equals(currentAllocationId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:{}",
+ slotId, currentAllocationId, reportedAllocationId);
+
+ // seems we have a disagreement about the slot assignments, need to correct it
+ allocationMap.removeAllocation(slotId);
+ allocationMap.addAllocation(slotId, reportedAllocationId);
+ }
+ } else {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:null, reported:{}",
+ slotId, reportedAllocationId);
+
+ // we thought the slot is free, should correct this information
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+
+ // remove this slot from free slots pool
+ freeSlots.remove(slotId);
+ }
+ } else {
+ // slot is reported empty
+
+ // check whether we also thought this slot is empty
+ if (allocationMap.isAllocated(slotId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:null",
+ slotId, allocationMap.getAllocationID(slotId));
+
+ // we thought the slot is in use, correct it
+ allocationMap.removeAllocation(slotId);
+
+ // we have a free slot!
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ }
+ }
+ }
+
+ /**
+ * When we have a free slot, try to fulfill the pending request first. If any request can be fulfilled,
+ * record this allocation in bookkeeping and send slot request to TaskManager, else we just add this slot
+ * to the free pool.
+ *
+ * @param freeSlot The free slot
+ */
+ private void handleFreeSlot(final ResourceSlot freeSlot) {
+ SlotRequest chosenRequest = chooseRequestToFulfill(freeSlot, pendingSlotRequests);
+
+ if (chosenRequest != null) {
+ pendingSlotRequests.remove(chosenRequest.getAllocationId());
+
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", freeSlot.getSlotId(),
+ chosenRequest.getAllocationId(), chosenRequest.getJobId());
+ allocationMap.addAllocation(freeSlot.getSlotId(), chosenRequest.getAllocationId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ freeSlots.put(freeSlot.getSlotId(), freeSlot);
+ }
+ }
+
+ /**
+ * Check whether the request is duplicated. We use AllocationID to identify slot request, for each
+ * formerly received slot request, it is either in pending list or already been allocated.
+ *
+ * @param request The slot request
+ * @return <tt>true</tt> if the request is duplicated
+ */
+ private boolean isRequestDuplicated(final SlotRequest request) {
+ final AllocationID allocationId = request.getAllocationId();
+ return pendingSlotRequests.containsKey(allocationId)
+ || allocationMap.isAllocated(allocationId);
+ }
+
+ /**
+ * Try to register slot, and tell if this slot is newly registered.
+ *
+ * @param slot The ResourceSlot which will be checked and registered
+ * @return <tt>true</tt> if we meet a new slot
+ */
+ private boolean registerNewSlot(final ResourceSlot slot) {
+ final SlotID slotId = slot.getSlotId();
+ final ResourceID resourceId = slotId.getResourceID();
+ if (!registeredSlots.containsKey(resourceId)) {
+ registeredSlots.put(resourceId, new HashMap<SlotID, ResourceSlot>());
+ }
+ return registeredSlots.get(resourceId).put(slotId, slot) == null;
+ }
+
+ private ResourceSlot getRegisteredSlot(final SlotID slotId) {
+ final ResourceID resourceId = slotId.getResourceID();
+ if (!registeredSlots.containsKey(resourceId)) {
+ return null;
+ }
+ return registeredSlots.get(resourceId).get(slotId);
+ }
+
+ // ------------------------------------------------------------------------
+ // Framework specific behavior
+ // ------------------------------------------------------------------------
+
+ /**
+ * Choose a slot to use among all free slots, the behavior is framework specified.
+ *
+ * @param request The slot request
+ * @param freeSlots All slots which can be used
+ * @return The slot we choose to use, <tt>null</tt> if we did not find a match
+ */
+ protected abstract ResourceSlot chooseSlotToUse(final SlotRequest request,
+ final Map<SlotID, ResourceSlot> freeSlots);
+
+ /**
+ * Choose a pending request to fulfill when we have a free slot, the behavior is framework specified.
+ *
+ * @param offeredSlot The free slot
+ * @param pendingRequests All the pending slot requests
+ * @return The chosen SlotRequest, <tt>null</tt> if we did not find a match
+ */
+ protected abstract SlotRequest chooseRequestToFulfill(final ResourceSlot offeredSlot,
+ final Map<AllocationID, SlotRequest> pendingRequests);
+
+ /**
+ * The framework specific code for allocating a container for specified resource profile.
+ *
+ * @param resourceProfile The resource profile
+ */
+ protected abstract void allocateContainer(final ResourceProfile resourceProfile);
+
+
+ // ------------------------------------------------------------------------
+ // Helper classes
+ // ------------------------------------------------------------------------
+
+ /**
+ * Maintaining the all the allocations with SlotID and AllocationID. We can get or remove the allocation info
--- End diff --
sorry for the typo
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/2388
I think i shall do the resolving thing.
The commits are squashed and conflicts been resolved.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by StephanEwen <gi...@git.apache.org>.
Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2388
I am taking a look at this now...
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/2388
Yes, this is for ResourceManager
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75698687
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove == null) {
+ return;
+ }
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if sot is empty.
+ * <p>
+ * Regarding 2: It will cause some weird situation since we may have some time-gap on how the slot's status really
+ * is. We may have some updates on the slot's allocation, but it doesn't reflected by TaskManager's heartbeat yet,
+ * and we may make some wrong decision if we cannot guarantee we have the exactly status about all the slots. So
--- End diff --
Typo: exact status
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76819506
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,525 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = checkNotNull(resourceManagerGateway);
+ this.registeredSlots = new HashMap<>(16);
+ this.pendingSlotRequests = new LinkedHashMap<>(16);
+ this.freeSlots = new HashMap<>(16);
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Cannot fulfil slot request, try to allocate a new container for it, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication (timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request has somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * Callback for TaskManager failures. In case that a TaskManager fails, we have to clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove != null) {
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if slot is empty.
+ * <p>
+ * Regarding 2: It will cause some weird situation since we may have some time-gap on how the slot's status really
+ * is. We may have some updates on the slot's allocation, but it doesn't reflected by TaskManager's heartbeat yet,
+ * and we may make some wrong decision if we cannot guarantee we have the exact status about all the slots. So
+ * the principle here is: We always trust TaskManager's heartbeat, we will correct our information based on that
+ * and take next action based on the diff between our information and heartbeat status.
+ *
+ * @param reportedStatus Reported slot status
+ */
+ void updateSlotStatus(final SlotStatus reportedStatus) {
+ final SlotID slotId = reportedStatus.getSlotID();
+ final ResourceSlot slot = new ResourceSlot(slotId, reportedStatus.getProfiler());
+
+ if (registerNewSlot(slot)) {
+ // we have a newly registered slot
+ LOG.info("New slot appeared, SlotID:{}, AllocationID:{}", slotId, reportedStatus.getAllocationID());
+
+ if (reportedStatus.getAllocationID() != null) {
+ // slot in use, record this in bookkeeping
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+ } else {
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ } else {
+ // slot exists, update current information
+ if (reportedStatus.getAllocationID() != null) {
+ // slot is reported in use
+ final AllocationID reportedAllocationId = reportedStatus.getAllocationID();
+
+ // check whether we also thought this slot is in use
+ if (allocationMap.isAllocated(slotId)) {
+ // we also think that slot is in use, check whether the AllocationID matches
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ if (!reportedAllocationId.equals(currentAllocationId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:{}",
+ slotId, currentAllocationId, reportedAllocationId);
+
+ // seems we have a disagreement about the slot assignments, need to correct it
+ allocationMap.removeAllocation(slotId);
+ allocationMap.addAllocation(slotId, reportedAllocationId);
+ }
+ } else {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:null, reported:{}",
+ slotId, reportedAllocationId);
+
+ // we thought the slot is free, should correct this information
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+
+ // remove this slot from free slots pool
+ freeSlots.remove(slotId);
+ }
+ } else {
+ // slot is reported empty
+
+ // check whether we also thought this slot is empty
+ if (allocationMap.isAllocated(slotId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:null",
+ slotId, allocationMap.getAllocationID(slotId));
+
+ // we thought the slot is in use, correct it
+ allocationMap.removeAllocation(slotId);
+
+ // we have a free slot!
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ }
+ }
+ }
+
+ /**
+ * When we have a free slot, try to fulfill the pending request first. If any request can be fulfilled,
+ * record this allocation in bookkeeping and send slot request to TaskManager, else we just add this slot
+ * to the free pool.
+ *
+ * @param freeSlot The free slot
+ */
+ private void handleFreeSlot(final ResourceSlot freeSlot) {
+ SlotRequest chosenRequest = chooseRequestToFulfill(freeSlot, pendingSlotRequests);
+
+ if (chosenRequest != null) {
+ pendingSlotRequests.remove(chosenRequest.getAllocationId());
+
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", freeSlot.getSlotId(),
+ chosenRequest.getAllocationId(), chosenRequest.getJobId());
+ allocationMap.addAllocation(freeSlot.getSlotId(), chosenRequest.getAllocationId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ freeSlots.put(freeSlot.getSlotId(), freeSlot);
+ }
+ }
+
+ /**
+ * Check whether the request is duplicated. We use AllocationID to identify slot request, for each
+ * formerly received slot request, it is either in pending list or already been allocated.
+ *
+ * @param request The slot request
+ * @return <tt>true</tt> if the request is duplicated
+ */
+ private boolean isRequestDuplicated(final SlotRequest request) {
+ final AllocationID allocationId = request.getAllocationId();
+ return pendingSlotRequests.containsKey(allocationId)
+ || allocationMap.isAllocated(allocationId);
+ }
+
+ /**
+ * Try to register slot, and tell if this slot is newly registered.
+ *
+ * @param slot The ResourceSlot which will be checked and registered
+ * @return <tt>true</tt> if we meet a new slot
+ */
+ private boolean registerNewSlot(final ResourceSlot slot) {
+ final SlotID slotId = slot.getSlotId();
+ final ResourceID resourceId = slotId.getResourceID();
+ if (!registeredSlots.containsKey(resourceId)) {
+ registeredSlots.put(resourceId, new HashMap<SlotID, ResourceSlot>());
+ }
+ return registeredSlots.get(resourceId).put(slotId, slot) == null;
+ }
+
+ private ResourceSlot getRegisteredSlot(final SlotID slotId) {
+ final ResourceID resourceId = slotId.getResourceID();
+ if (!registeredSlots.containsKey(resourceId)) {
+ return null;
+ }
+ return registeredSlots.get(resourceId).get(slotId);
+ }
+
+ // ------------------------------------------------------------------------
+ // Framework specific behavior
+ // ------------------------------------------------------------------------
+
+ /**
+ * Choose a slot to use among all free slots, the behavior is framework specified.
+ *
+ * @param request The slot request
+ * @param freeSlots All slots which can be used
+ * @return The slot we choose to use, <tt>null</tt> if we did not find a match
+ */
+ protected abstract ResourceSlot chooseSlotToUse(final SlotRequest request,
+ final Map<SlotID, ResourceSlot> freeSlots);
+
+ /**
+ * Choose a pending request to fulfill when we have a free slot, the behavior is framework specified.
+ *
+ * @param offeredSlot The free slot
+ * @param pendingRequests All the pending slot requests
+ * @return The chosen SlotRequest, <tt>null</tt> if we did not find a match
+ */
+ protected abstract SlotRequest chooseRequestToFulfill(final ResourceSlot offeredSlot,
+ final Map<AllocationID, SlotRequest> pendingRequests);
+
+ /**
+ * The framework specific code for allocating a container for specified resource profile.
+ *
+ * @param resourceProfile The resource profile
+ */
+ protected abstract void allocateContainer(final ResourceProfile resourceProfile);
+
+
+ // ------------------------------------------------------------------------
+ // Helper classes
+ // ------------------------------------------------------------------------
+
+ /**
+ * Maintaining the all the allocations with SlotID and AllocationID. We can get or remove the allocation info
--- End diff --
We maintain all the allocations with...
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76919875
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,525 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
--- End diff --
When a slot is allocated, RM should send request to TM, but this decision is made by SlotManager. So this gateway is a proxy used by SlotManager to send a request to TM through RM
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75694327
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
--- End diff --
`checkNotNull` would be good here
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75696013
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
--- End diff --
"has somehow been"
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76919993
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/ResourceID.java ---
@@ -63,9 +63,7 @@ public final int hashCode() {
@Override
public String toString() {
- return "ResourceID{" +
- "resourceId='" + resourceId + '\'' +
- '}';
+ return resourceId;
--- End diff --
It's mainly for the INFO/DEBUG logs, want to show some simple messages when we have to print ResourceID
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on the issue:
https://github.com/apache/flink/pull/2388
hi @tillrohrmann , thanks for the reviewing, all your comments will be addressed.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75697458
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove == null) {
+ return;
+ }
--- End diff --
We could also write `if (slotsIdsToRemove != null) { for ... }`
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75695498
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
--- End diff --
"Cannot fulfil slot request. Try to allocate a new container to fulfil the slot request." or so
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75699254
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove == null) {
+ return;
+ }
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if sot is empty.
+ * <p>
+ * Regarding 2: It will cause some weird situation since we may have some time-gap on how the slot's status really
+ * is. We may have some updates on the slot's allocation, but it doesn't reflected by TaskManager's heartbeat yet,
+ * and we may make some wrong decision if we cannot guarantee we have the exactly status about all the slots. So
+ * the principle here is: We always trust TaskManager's heartbeat, we will correct our information based on that
+ * and take next action based on the diff between our information and heartbeat status.
+ *
+ * @param reportedStatus Reported slot status
+ */
+ void updateSlotStatus(final SlotStatus reportedStatus) {
+ final SlotID slotId = reportedStatus.getSlotID();
+ final ResourceSlot slot = new ResourceSlot(slotId, reportedStatus.getProfiler());
+
+ if (registerNewSlot(slot)) {
+ // we have a newly registered slot
+ LOG.info("New slot appeared, SlotID:{}, AllocationID:{}", slotId, reportedStatus.getAllocationID());
+
+ if (reportedStatus.getAllocationID() != null) {
+ // slot in use, record this in bookkeeping
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+ } else {
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ return;
--- End diff --
Maybe we could use `if () {} else {}` here to get rid of this `return` statement.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2388
Thank you for your work @KurtYoung. Merging the PR.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75694408
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
--- End diff --
Usually it's always a good idea to specify the initial capacity of Java collections.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75695600
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
--- End diff --
whitespace between `communcation` and `(`.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75697328
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
--- End diff --
Maybe: "Callback for task manager failures. In case that a task manager fails, we have to clean up all its slots."
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2388
Auto-closing from a commit doesn't in the feature branch. Could you please close the PR?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76920002
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/SlotID.java ---
@@ -75,9 +75,15 @@ public int hashCode() {
@Override
public String toString() {
- return "SlotID{" +
- "resourceId=" + resourceId +
- ", slotId=" + slotId +
- '}';
+ return resourceId + "_" + slotId;
--- End diff --
Same above
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75698435
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
--- End diff --
Can we try to get rid of guava collections? The reason is that we try to move away from Guava because it has caused a lot of trouble in the past (incompatibilities with user code Guava versions).
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by mxm <gi...@git.apache.org>.
Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76822478
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/SlotID.java ---
@@ -75,9 +75,15 @@ public int hashCode() {
@Override
public String toString() {
- return "SlotID{" +
- "resourceId=" + resourceId +
- ", slotId=" + slotId +
- '}';
+ return resourceId + "_" + slotId;
+ }
+
+ /**
+ * Generate a random slot id.
+ *
+ * @return A random slot id.
+ */
+ public static SlotID generate() {
+ return new SlotID(ResourceID.generate(), 0);
--- End diff --
This always generates the same slot id. At this point I'm not really sure what the purpose of the slot id is.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75698545
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove == null) {
+ return;
+ }
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if sot is empty.
--- End diff --
Typo: slot
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung closed the pull request at:
https://github.com/apache/flink/pull/2388
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink issue #2388: [FLINK-4347][cluster management] Implement SlotManager co...
Posted by StephanEwen <gi...@git.apache.org>.
Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2388
Just to avoid doubt: This should run as part of the ResourceManager, correct?
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by tillrohrmann <gi...@git.apache.org>.
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r75699662
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/SlotManager.java ---
@@ -0,0 +1,519 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.clusterframework;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.clusterframework.types.ResourceSlot;
+import org.apache.flink.runtime.clusterframework.types.SlotID;
+import org.apache.flink.runtime.rpc.resourcemanager.ResourceManagerGateway;
+import org.apache.flink.runtime.rpc.resourcemanager.SlotRequest;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotReport;
+import org.apache.flink.runtime.rpc.taskexecutor.SlotStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * SlotManager is responsible for receiving slot requests and do slot allocations. It allows to request
+ * slots from registered TaskManagers and issues container allocation requests in case of there are not
+ * enough available slots. Besides, it should sync its slot allocation with TaskManager's heartbeat.
+ * <p>
+ * The main operation principle of SlotManager is:
+ * <ul>
+ * <li>1. All slot allocation status should be synced with TaskManager, which is the ground truth.</li>
+ * <li>2. All slots that have registered must be tracked, either by free pool or allocated pool.</li>
+ * <li>3. All slot requests will be handled by best efforts, there is no guarantee that one request will be
+ * fulfilled in time or correctly allocated. Conflicts or timeout or some special error will happen, it should
+ * be handled outside SlotManager. SlotManager will make each decision based on the information it currently
+ * holds.</li>
+ * </ul>
+ * <b>IMPORTANT:</b> This class is <b>Not Thread-safe</b>.
+ */
+public abstract class SlotManager {
+
+ private static final Logger LOG = LoggerFactory.getLogger(SlotManager.class);
+
+ /** Gateway to communicate with ResourceManager */
+ private final ResourceManagerGateway resourceManagerGateway;
+
+ /** All registered slots, including free and allocated slots */
+ private final Map<ResourceID, Map<SlotID, ResourceSlot>> registeredSlots;
+
+ /** All pending slot requests, waiting available slots to fulfil */
+ private final Map<AllocationID, SlotRequest> pendingSlotRequests;
+
+ /** All free slots that can be used to be allocated */
+ private final Map<SlotID, ResourceSlot> freeSlots;
+
+ /** All allocations, we can lookup allocations either by SlotID or AllocationID */
+ private final AllocationMap allocationMap;
+
+ public SlotManager(ResourceManagerGateway resourceManagerGateway) {
+ this.resourceManagerGateway = resourceManagerGateway;
+ this.registeredSlots = new HashMap<>();
+ this.pendingSlotRequests = new LinkedHashMap<>();
+ this.freeSlots = new HashMap<>();
+ this.allocationMap = new AllocationMap();
+ }
+
+ // ------------------------------------------------------------------------
+ // slot managements
+ // ------------------------------------------------------------------------
+
+ /**
+ * Request a slot with requirements, we may either fulfill the request or pending it. Trigger container
+ * allocation if we don't have enough resource. If we have free slot which can match the request, record
+ * this allocation and forward the request to TaskManager through ResourceManager (we want this done by
+ * RPC's main thread to avoid race condition).
+ *
+ * @param request The detailed request of the slot
+ */
+ public void requestSlot(final SlotRequest request) {
+ if (isRequestDuplicated(request)) {
+ LOG.warn("Duplicated slot request, AllocationID:{}", request.getAllocationId());
+ return;
+ }
+
+ // try to fulfil the request with current free slots
+ ResourceSlot slot = chooseSlotToUse(request, freeSlots);
+ if (slot != null) {
+ LOG.info("Assigning SlotID({}) to AllocationID({}), JobID:{}", slot.getSlotId(),
+ request.getAllocationId(), request.getJobId());
+
+ // record this allocation in bookkeeping
+ allocationMap.addAllocation(slot.getSlotId(), request.getAllocationId());
+
+ // remove selected slot from free pool
+ freeSlots.remove(slot.getSlotId());
+
+ // TODO: send slot request to TaskManager
+ } else {
+ LOG.info("Does not have enough slot now, pending request and try to allocate new container, " +
+ "AllocationID:{}, JobID:{}", request.getAllocationId(), request.getJobId());
+ allocateContainer(request.getResourceProfile());
+ pendingSlotRequests.put(request.getAllocationId(), request);
+ }
+ }
+
+ /**
+ * Sync slot status with TaskManager's SlotReport.
+ */
+ public void updateSlotStatus(final SlotReport slotReport) {
+ for (SlotStatus slotStatus : slotReport.getSlotsStatus()) {
+ updateSlotStatus(slotStatus);
+ }
+ }
+
+ /**
+ * The slot request to TaskManager may be either failed by rpc communication(timeout, network error, etc.)
+ * or really rejected by TaskManager. We shall retry this request by:
+ * <ul>
+ * <li>1. verify and clear all the previous allocate information for this request
+ * <li>2. try to request slot again
+ * </ul>
+ * <p>
+ * This may cause some duplicate allocation, e.g. the slot request to TaskManager is successful but the response
+ * is lost somehow, so we may request a slot in another TaskManager, this causes two slots assigned to one request,
+ * but it can be taken care of by rejecting registration at JobManager.
+ *
+ * @param originalRequest The original slot request
+ * @param slotId The target SlotID
+ */
+ public void handleSlotRequestFailedAtTaskManager(final SlotRequest originalRequest, final SlotID slotId) {
+ final AllocationID originalAllocationId = originalRequest.getAllocationId();
+ LOG.info("Slot request failed at TaskManager, SlotID:{}, AllocationID:{}, JobID:{}",
+ slotId, originalAllocationId, originalRequest.getJobId());
+
+ // verify the allocation info before we do anything
+ if (freeSlots.containsKey(slotId)) {
+ // this slot is currently empty, no need to de-allocate it from our allocations
+ LOG.info("Original slot is somehow empty, retrying this request");
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ } else if (allocationMap.isAllocated(slotId)) {
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ // check whether we have an agreement on whom this slot belongs to
+ if (originalAllocationId.equals(currentAllocationId)) {
+ LOG.info("De-allocate this request and retry");
+ allocationMap.removeAllocation(currentAllocationId);
+
+ // put this slot back to free pool
+ ResourceSlot slot = checkNotNull(getRegisteredSlot(slotId));
+ freeSlots.put(slotId, slot);
+
+ // retry the request
+ requestSlot(originalRequest);
+ } else {
+ // the slot is taken by someone else, no need to de-allocate it from our allocations
+ LOG.info("Original slot is taken by someone else, current AllocationID:{}", currentAllocationId);
+
+ // before retry, we should double check whether this request was allocated by some other ways
+ if (!allocationMap.isAllocated(originalAllocationId)) {
+ requestSlot(originalRequest);
+ } else {
+ LOG.info("The failed request is somehow been allocated, SlotID:{}",
+ allocationMap.getSlotID(originalAllocationId));
+ }
+ }
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+
+ /**
+ * TaskManager been notified failure, we should clean up all its slots.
+ *
+ * @param resourceId The ResourceID of the TaskManager
+ */
+ public void notifyTaskManagerFailure(final ResourceID resourceId) {
+ LOG.info("Resource:{} been notified failure", resourceId);
+ final Map<SlotID, ResourceSlot> slotIdsToRemove = registeredSlots.remove(resourceId);
+ if (slotIdsToRemove == null) {
+ return;
+ }
+ for (SlotID slotId : slotIdsToRemove.keySet()) {
+ LOG.info("Removing Slot:{} upon resource failure", slotId);
+ if (freeSlots.containsKey(slotId)) {
+ freeSlots.remove(slotId);
+ } else if (allocationMap.isAllocated(slotId)) {
+ allocationMap.removeAllocation(slotId);
+ } else {
+ LOG.error("BUG! {} is neither in free pool nor in allocated pool", slotId);
+ }
+ }
+ }
+
+ // ------------------------------------------------------------------------
+ // internal behaviors
+ // ------------------------------------------------------------------------
+
+ /**
+ * Update slot status based on TaskManager's report. There are mainly two situations when we receive the report:
+ * <ul>
+ * <li>1. The slot is newly registered.</li>
+ * <li>2. The slot has registered, it contains its current status.</li>
+ * </ul>
+ * <p>
+ * Regarding 1: It's fairly simple, we just record this slot's status, and trigger schedule if sot is empty.
+ * <p>
+ * Regarding 2: It will cause some weird situation since we may have some time-gap on how the slot's status really
+ * is. We may have some updates on the slot's allocation, but it doesn't reflected by TaskManager's heartbeat yet,
+ * and we may make some wrong decision if we cannot guarantee we have the exactly status about all the slots. So
+ * the principle here is: We always trust TaskManager's heartbeat, we will correct our information based on that
+ * and take next action based on the diff between our information and heartbeat status.
+ *
+ * @param reportedStatus Reported slot status
+ */
+ void updateSlotStatus(final SlotStatus reportedStatus) {
+ final SlotID slotId = reportedStatus.getSlotID();
+ final ResourceSlot slot = new ResourceSlot(slotId, reportedStatus.getProfiler());
+
+ if (registerNewSlot(slot)) {
+ // we have a newly registered slot
+ LOG.info("New slot appeared, SlotID:{}, AllocationID:{}", slotId, reportedStatus.getAllocationID());
+
+ if (reportedStatus.getAllocationID() != null) {
+ // slot in use, record this in bookkeeping
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+ } else {
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ return;
+ }
+
+ // slot exists, update current information
+ if (reportedStatus.getAllocationID() != null) {
+ // slot is reported in use
+ final AllocationID reportedAllocationId = reportedStatus.getAllocationID();
+
+ // check whether we also thought this slot is in use
+ if (allocationMap.isAllocated(slotId)) {
+ // we also think that slot is in use, check whether the AllocationID matches
+ final AllocationID currentAllocationId = allocationMap.getAllocationID(slotId);
+
+ if (!reportedAllocationId.equals(currentAllocationId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:{}",
+ slotId, currentAllocationId, reportedAllocationId);
+
+ // seems we have a disagreement about the slot assignments, need to correct it
+ allocationMap.removeAllocation(slotId);
+ allocationMap.addAllocation(slotId, reportedAllocationId);
+ }
+ } else {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:null, reported:{}",
+ slotId, reportedAllocationId);
+
+ // we thought the slot is free, should correct this information
+ allocationMap.addAllocation(slotId, reportedStatus.getAllocationID());
+
+ // remove this slot from free slots pool
+ freeSlots.remove(slotId);
+ }
+ } else {
+ // slot is reported empty
+
+ // check whether we also thought this slot is empty
+ if (allocationMap.isAllocated(slotId)) {
+ LOG.info("Slot allocation info mismatch! SlotID:{}, current:{}, reported:null",
+ slotId, allocationMap.getAllocationID(slotId));
+
+ // we thought the slot is in use, correct it
+ allocationMap.removeAllocation(slotId);
+
+ // we have a free slot!
+ handleFreeSlot(new ResourceSlot(slotId, reportedStatus.getProfiler()));
+ }
+ }
+ }
+
+ /**
+ * When we have a free slot, try to fulfill the pending request first. If any request can be fulfilled,
+ * record this allocation in bookkeeping and send slot request to TaskManager, else we just add this slot
+ * to the free pool.
+ *
+ * @param freeSlot The free slot
+ */
+ private void handleFreeSlot(final ResourceSlot freeSlot) {
+ SlotRequest chosenRequest = chooseRequestToFulfill(freeSlot, pendingSlotRequests);
--- End diff --
line break
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---
[GitHub] flink pull request #2388: [FLINK-4347][cluster management] Implement SlotMan...
Posted by KurtYoung <gi...@git.apache.org>.
Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/2388#discussion_r76920351
--- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/clusterframework/types/SlotID.java ---
@@ -75,9 +75,15 @@ public int hashCode() {
@Override
public String toString() {
- return "SlotID{" +
- "resourceId=" + resourceId +
- ", slotId=" + slotId +
- '}';
+ return resourceId + "_" + slotId;
+ }
+
+ /**
+ * Generate a random slot id.
+ *
+ * @return A random slot id.
+ */
+ public static SlotID generate() {
+ return new SlotID(ResourceID.generate(), 0);
--- End diff --
A SlotID is a identify of the slot which locates in some TaskManager. In current flink's implementaion, we use integer to represent a slot within TM, i think we should make this more explicit.
For generating a random slot, i think random a resource id which slot is located is enough. (We may have some limitation of the integer else where, like the integer can not be greater than the total slot number of the TM, so i choose 0)
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---