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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/08/21 08:28:45 UTC
[GitHub] [flink] zhuzhurk commented on a change in pull request #13181: [FLINK-18957] Implement logical request bulk tracking in SlotSharingExecutionSlotAllocator
zhuzhurk commented on a change in pull request #13181:
URL: https://github.com/apache/flink/pull/13181#discussion_r474428620
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/PhysicalSlotRequestBulkCheckerImpl.java
##########
@@ -0,0 +1,219 @@
+/*
+ * 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.jobmaster.slotpool;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor;
+import org.apache.flink.runtime.jobmaster.SlotInfo;
+import org.apache.flink.util.clock.Clock;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.TimeoutException;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+class PhysicalSlotRequestBulkCheckerImpl implements PhysicalSlotRequestBulkChecker {
+
+ private ComponentMainThreadExecutor componentMainThreadExecutor;
+
+ private final Supplier<Set<SlotInfo>> slotsRetriever;
+
+ private final Clock clock;
+
+ PhysicalSlotRequestBulkCheckerImpl(final Supplier<Set<SlotInfo>> slotsRetriever, final Clock clock) {
+ this.slotsRetriever = checkNotNull(slotsRetriever);
+ this.clock = checkNotNull(clock);
+ }
+
+ void start(final ComponentMainThreadExecutor mainThreadExecutor) {
+ this.componentMainThreadExecutor = mainThreadExecutor;
+ }
+
+ @Override
+ public void schedulePendingRequestBulkTimeoutCheck(PhysicalSlotRequestBulk bulk, Time timeout) {
+ schedulePendingRequestBulkTimeoutCheck(new PhysicalSlotRequestBulkWithTimestamp(bulk), timeout);
+ }
+
+ private void schedulePendingRequestBulkTimeoutCheck(PhysicalSlotRequestBulkWithTimestamp bulk, Time timeout) {
+ bulk.markUnfulfillable(clock.relativeTimeMillis());
Review comment:
If we implement it like this, it turns to be that we require the bulk to pass every fulfill-ability check or fails otherwise. This means a request can be recognized as timed out if a slot gets lost right before its fulfill-ability check even if the bulk has passed the check last time.
How about moving this `markUnfulfillable()` into the above `schedulePendingRequestBulkTimeoutCheck ()`.
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/PhysicalSlotRequestBulkChecker.java
##########
@@ -18,131 +18,14 @@
package org.apache.flink.runtime.jobmaster.slotpool;
-import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.time.Time;
-import org.apache.flink.runtime.clusterframework.types.AllocationID;
-import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
-import org.apache.flink.runtime.jobmaster.SlotInfo;
-import org.apache.flink.util.clock.Clock;
-
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.Optional;
-import java.util.Set;
-import java.util.function.Supplier;
-import java.util.stream.Collectors;
-
-import static org.apache.flink.util.Preconditions.checkNotNull;
/**
- * This class helps to check the status of physical slot request bulks.
+ * This class tracks a fulfil-ability timeout of a bulk of physical slot requests.
+ *
+ * <p>The bulk gets canceled if the timeout occurs and the bulk is not fulfilled.
Review comment:
`is not fulfilled` -> `is not fulfillable`
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/MergingSharedSlotProfileRetrieverFactory.java
##########
@@ -41,16 +41,12 @@
class MergingSharedSlotProfileRetrieverFactory implements SharedSlotProfileRetriever.SharedSlotProfileRetrieverFactory {
private final PreferredLocationsRetriever preferredLocationsRetriever;
- private final Function<ExecutionVertexID, ResourceProfile> resourceProfileRetriever;
-
private final Function<ExecutionVertexID, AllocationID> priorAllocationIdRetriever;
MergingSharedSlotProfileRetrieverFactory(
Review comment:
Seems extra indentation of all method params in this class are removed unexpectedly.
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/PhysicalSlotRequestBulkCheckerImpl.java
##########
@@ -0,0 +1,219 @@
+/*
+ * 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.jobmaster.slotpool;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor;
+import org.apache.flink.runtime.jobmaster.SlotInfo;
+import org.apache.flink.util.clock.Clock;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.TimeoutException;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+class PhysicalSlotRequestBulkCheckerImpl implements PhysicalSlotRequestBulkChecker {
+
+ private ComponentMainThreadExecutor componentMainThreadExecutor;
+
+ private final Supplier<Set<SlotInfo>> slotsRetriever;
+
+ private final Clock clock;
+
+ PhysicalSlotRequestBulkCheckerImpl(final Supplier<Set<SlotInfo>> slotsRetriever, final Clock clock) {
+ this.slotsRetriever = checkNotNull(slotsRetriever);
+ this.clock = checkNotNull(clock);
+ }
+
+ void start(final ComponentMainThreadExecutor mainThreadExecutor) {
+ this.componentMainThreadExecutor = mainThreadExecutor;
+ }
+
+ @Override
+ public void schedulePendingRequestBulkTimeoutCheck(PhysicalSlotRequestBulk bulk, Time timeout) {
+ schedulePendingRequestBulkTimeoutCheck(new PhysicalSlotRequestBulkWithTimestamp(bulk), timeout);
+ }
+
+ private void schedulePendingRequestBulkTimeoutCheck(PhysicalSlotRequestBulkWithTimestamp bulk, Time timeout) {
+ bulk.markUnfulfillable(clock.relativeTimeMillis());
+ componentMainThreadExecutor.schedule(() -> {
+ TimeoutCheckResult result = checkPhysicalSlotRequestBulkTimeout(bulk, timeout);
+
+ switch (result) {
+ case PENDING:
+ //re-schedule the timeout check
+ schedulePendingRequestBulkTimeoutCheck(bulk, timeout);
+ break;
+ case TIMEOUT:
+ bulk.getPhysicalSlotRequestBulk().cancel(new TimeoutException("Slot request bulk is not fulfillable!"));
+ break;
+ case FULFILLED:
+ default:
+ // no action to take
+ break;
+ }
+ }, timeout.getSize(), timeout.getUnit());
+ }
+
+ /**
+ * Check the slot request bulk and timeout its requests if it has been unfulfillable for too long.
+ * @param slotRequestBulk bulk of slot requests
+ * @param slotRequestTimeout indicates how long a pending request can be unfulfillable
+ * @return result of the check, indicating the bulk is fulfilled, still pending, or timed out
+ */
+ @VisibleForTesting
+ TimeoutCheckResult checkPhysicalSlotRequestBulkTimeout(
+ final PhysicalSlotRequestBulkWithTimestamp slotRequestBulk,
+ final Time slotRequestTimeout) {
+
+ if (slotRequestBulk.getPhysicalSlotRequestBulk().getPendingRequests().isEmpty()) {
+ return TimeoutCheckResult.FULFILLED;
+ }
+
+ final boolean fulfillable = isSlotRequestBulkFulfillable(slotRequestBulk.getPhysicalSlotRequestBulk(), slotsRetriever);
+ if (fulfillable) {
+ slotRequestBulk.markFulfillable();
+ } else {
+ final long currentTimestamp = clock.relativeTimeMillis();
+
+ slotRequestBulk.markUnfulfillable(currentTimestamp);
+
+ final long unfulfillableSince = slotRequestBulk.getUnfulfillableSince();
+ if (unfulfillableSince + slotRequestTimeout.toMilliseconds() <= currentTimestamp) {
+ return TimeoutCheckResult.TIMEOUT;
+ }
+ }
+
+ return TimeoutCheckResult.PENDING;
+ }
+
+ /**
+ * Returns whether the given bulk of slot requests are possible to be fulfilled at the same time
+ * with all the reusable slots in the slot pool. A reusable slot means the slot is available or
+ * will not be occupied indefinitely.
+ *
+ * @param slotRequestBulk bulk of slot requests to check
+ * @param slotsRetriever supplies slots to be used for the fulfill-ability check
+ * @return true if the slot requests are possible to be fulfilled, otherwise false
+ */
+ @VisibleForTesting
+ static boolean isSlotRequestBulkFulfillable(
+ final PhysicalSlotRequestBulk slotRequestBulk,
+ final Supplier<Set<SlotInfo>> slotsRetriever) {
+
+ final Set<AllocationID> assignedSlots = slotRequestBulk.getAllocationIdsOfFulfilledRequests();
+ final Set<SlotInfo> reusableSlots = getReusableSlots(slotsRetriever, assignedSlots);
+ return areRequestsFulfillableWithSlots(slotRequestBulk.getPendingRequests(), reusableSlots);
+ }
+
+ private static Set<SlotInfo> getReusableSlots(
+ final Supplier<Set<SlotInfo>> slotsRetriever,
+ final Set<AllocationID> slotsToExclude) {
+
+ return slotsRetriever.get().stream()
+ .filter(slotInfo -> !slotInfo.willBeOccupiedIndefinitely())
+ .filter(slotInfo -> !slotsToExclude.contains(slotInfo.getAllocationId()))
+ .collect(Collectors.toSet());
+ }
+
+ private static boolean areRequestsFulfillableWithSlots(
+ final Collection<ResourceProfile> requestResourceProfiles,
+ final Set<SlotInfo> slots) {
+
+ final Set<SlotInfo> remainingSlots = new HashSet<>(slots);
+ for (ResourceProfile requestResourceProfile : requestResourceProfiles) {
+ final Optional<SlotInfo> matchedSlot = findMatchingSlotForRequest(requestResourceProfile, remainingSlots);
+ if (matchedSlot.isPresent()) {
+ remainingSlots.remove(matchedSlot.get());
+ } else {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ private static Optional<SlotInfo> findMatchingSlotForRequest(
+ final ResourceProfile requestResourceProfile,
+ final Collection<SlotInfo> slots) {
+
+ return slots.stream().filter(slot -> slot.getResourceProfile().isMatching(requestResourceProfile)).findFirst();
+ }
+
+ static PhysicalSlotRequestBulkCheckerImpl fromSlotPool(final SlotPool slotPool, final Clock clock) {
+ return new PhysicalSlotRequestBulkCheckerImpl(() -> getAllSlotInfos(slotPool), clock);
+ }
+
+ private static Set<SlotInfo> getAllSlotInfos(SlotPool slotPool) {
+ return Stream
+ .concat(
+ slotPool.getAvailableSlotsInformation().stream(),
+ slotPool.getAllocatedSlotsInformation().stream())
+ .collect(Collectors.toSet());
+ }
+
+ enum TimeoutCheckResult {
+ PENDING,
+
+ FULFILLED,
+
+ TIMEOUT
+ }
+
+ @VisibleForTesting
+ static class PhysicalSlotRequestBulkWithTimestamp {
Review comment:
How about to let it implement `PhysicalSlotRequestBulk` to simplify its usages and hide the internal `PhysicalSlotRequestBulk`?
And what about adding a separate class file for it? I can see we have a separate test class for it already.
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/SchedulerImpl.java
##########
@@ -98,14 +103,16 @@ public SchedulerImpl(
"Scheduler is not initialized with proper main thread executor. " +
"Call to Scheduler.start(...) required.");
- this.bulkSlotProvider = new BulkSlotProviderImpl(slotSelectionStrategy, slotPool);
+ this.slotRequestBulkChecker = PhysicalSlotRequestBulkCheckerImpl.fromSlotPool(slotPool, SystemClock.getInstance());
+ this.bulkSlotProvider = new BulkSlotProviderImpl(slotSelectionStrategy, slotPool, slotRequestBulkChecker);
+ this.physicalSlotProvider = new PhysicalSlotProviderImpl(slotSelectionStrategy, slotPool);
Review comment:
The `PhysicalSlotProviderImpl` ctor will invoke `slotPool.disableBatchSlotRequestTimeoutCheck()` unconditionally.
Maybe we should move that invocation to `PhysicalSlotProviderImpl#requestNewSlot()`?
##########
File path: flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/slotpool/PhysicalSlotRequestBulkImpl.java
##########
@@ -0,0 +1,76 @@
+/*
+ * 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.jobmaster.slotpool;
+
+import org.apache.flink.runtime.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.jobmaster.SlotRequestId;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.BiConsumer;
+
+/**
+ * Represents a bulk of physical slot requests.
+ */
+class PhysicalSlotRequestBulkImpl implements PhysicalSlotRequestBulk {
Review comment:
I think this class can also be removed when we remove `BulkSlotProvider` and `OneSlotPerExecutionSlotAllocator`.
But it is used in tests of `PhysicalSlotRequestBulkCheckerImpl` and `PhysicalSlotRequestBulkWithTimestamp`.
How about adding a separate `TestingPhysicalSlotRequestBulk` for those tests?
I'm also fine if we do it in a separate task or when we are removing the `BulkSlotProvider`.
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