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Posted to issues@ozone.apache.org by GitBox <gi...@apache.org> on 2022/10/05 20:04:02 UTC
[GitHub] [ozone] lokeshj1703 commented on a diff in pull request #3782: HDDS-7214. Continuous start & stop can have hanging threads in stopping
lokeshj1703 commented on code in PR #3782:
URL: https://github.com/apache/ozone/pull/3782#discussion_r985684506
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java:
##########
@@ -893,32 +80,36 @@ private void resetState() {
@Override
public void notifyStatusChanged() {
boolean shouldStop = false;
- boolean shouldRun = false;
lock.lock();
try {
if (!scmContext.isLeader() || scmContext.isInSafeMode()) {
- shouldStop = isBalancerRunning();
- } else {
- shouldRun = shouldRun();
+ shouldStop = canBalancerStop();
}
} finally {
lock.unlock();
}
-
if (shouldStop) {
LOG.info("Stopping ContainerBalancer in this scm on status change");
stop();
+ return;
}
- if (shouldRun) {
- LOG.info("Starting ContainerBalancer in this scm on status change");
- try {
- start();
- } catch (IllegalContainerBalancerStateException |
- InvalidContainerBalancerConfigurationException e) {
- LOG.warn("Could not start ContainerBalancer on raft/safe-mode " +
- "status change.", e);
+ lock.lock();
Review Comment:
It is a bit inconsistent that we need to take lock for start but not for stop call above.
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java:
##########
@@ -893,32 +80,36 @@ private void resetState() {
@Override
public void notifyStatusChanged() {
boolean shouldStop = false;
- boolean shouldRun = false;
lock.lock();
try {
if (!scmContext.isLeader() || scmContext.isInSafeMode()) {
- shouldStop = isBalancerRunning();
- } else {
- shouldRun = shouldRun();
+ shouldStop = canBalancerStop();
Review Comment:
Unrelated to PR: I think we can simplify the code.
`shouldRun() = !shouldStop()` would be a reasonable statement.
Also shouldStop is not taking the saved configuration into account so shouldRn is a better function to use after accounting for these checks. `!scmContext.isLeader() || scmContext.isInSafeMode()`
##########
hadoop-hdds/server-scm/src/test/java/org/apache/hadoop/hdds/scm/container/balancer/TestContainerBalancer.java:
##########
@@ -212,559 +206,102 @@ public void setup() throws IOException, NodeNotFoundException,
}
@Test
- public void testCalculationOfUtilization() {
- Assertions.assertEquals(nodesInCluster.size(), nodeUtilizations.size());
- for (int i = 0; i < nodesInCluster.size(); i++) {
- Assertions.assertEquals(nodeUtilizations.get(i),
- nodesInCluster.get(i).calculateUtilization(), 0.0001);
- }
-
+ public void testShouldRun() throws Exception {
+ boolean doRun = containerBalancer.shouldRun();
// should be equal to average utilization of the cluster
- Assertions.assertEquals(averageUtilization,
- containerBalancer.calculateAvgUtilization(nodesInCluster), 0.0001);
- }
-
- /**
- * Checks whether ContainerBalancer is correctly updating the list of
- * unBalanced nodes with varying values of Threshold.
- */
- @Test
- public void
- initializeIterationShouldUpdateUnBalancedNodesWhenThresholdChanges()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- List<DatanodeUsageInfo> expectedUnBalancedNodes;
- List<DatanodeUsageInfo> unBalancedNodesAccordingToBalancer;
-
- // check for random threshold values
- for (int i = 0; i < 50; i++) {
- double randomThreshold = RANDOM.nextDouble() * 100;
-
- balancerConfiguration.setThreshold(randomThreshold);
- startBalancer(balancerConfiguration);
-
- // waiting for balance completed.
- // TODO: this is a temporary implementation for now
- // modify this after balancer is fully completed
- try {
- Thread.sleep(100);
- } catch (InterruptedException e) { }
-
- expectedUnBalancedNodes =
- determineExpectedUnBalancedNodes(randomThreshold);
- unBalancedNodesAccordingToBalancer =
- containerBalancer.getUnBalancedNodes();
-
- stopBalancer();
- Assertions.assertEquals(
- expectedUnBalancedNodes.size(),
- unBalancedNodesAccordingToBalancer.size());
-
- for (int j = 0; j < expectedUnBalancedNodes.size(); j++) {
- Assertions.assertEquals(
- expectedUnBalancedNodes.get(j).getDatanodeDetails(),
- unBalancedNodesAccordingToBalancer.get(j).getDatanodeDetails());
- }
- }
+ Assertions.assertEquals(doRun, false);
+ containerBalancer.saveConfiguration(balancerConfiguration, true, 0);
+ doRun = containerBalancer.shouldRun();
+ Assertions.assertEquals(doRun, true);
+ containerBalancer.saveConfiguration(balancerConfiguration, false, 0);
+ doRun = containerBalancer.shouldRun();
+ Assertions.assertEquals(doRun, false);
}
- /**
- * Checks whether the list of unBalanced nodes is empty when the cluster is
- * balanced.
- */
@Test
- public void unBalancedNodesListShouldBeEmptyWhenClusterIsBalanced()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- balancerConfiguration.setThreshold(99.99);
- startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(100);
-
- stopBalancer();
- ContainerBalancerMetrics metrics = containerBalancer.getMetrics();
- Assertions.assertEquals(0, containerBalancer.getUnBalancedNodes().size());
- Assertions.assertEquals(0, metrics.getNumDatanodesUnbalanced());
- }
-
- /**
- * ContainerBalancer should not involve more datanodes than the
- * maxDatanodesRatioToInvolvePerIteration limit.
- */
- @Test
- public void containerBalancerShouldObeyMaxDatanodesToInvolveLimit()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- int percent = 20;
- balancerConfiguration.setMaxDatanodesPercentageToInvolvePerIteration(
- percent);
- balancerConfiguration.setMaxSizeToMovePerIteration(100 * STORAGE_UNIT);
- balancerConfiguration.setThreshold(1);
- balancerConfiguration.setIterations(1);
- startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(500);
-
- int number = percent * numberOfNodes / 100;
- ContainerBalancerMetrics metrics = containerBalancer.getMetrics();
- Assertions.assertFalse(
- containerBalancer.getCountDatanodesInvolvedPerIteration() > number);
- Assertions.assertTrue(
- metrics.getNumDatanodesInvolvedInLatestIteration() > 0);
- Assertions.assertFalse(
- metrics.getNumDatanodesInvolvedInLatestIteration() > number);
- stopBalancer();
- }
+ public void testStartBalancerStop() throws Exception {
+ Mockito.when(replicationManager.move(Mockito.any(ContainerID.class),
+ Mockito.any(DatanodeDetails.class),
+ Mockito.any(DatanodeDetails.class)))
+ .thenReturn(genCompletableFuture(1000));
- @Test
- public void containerBalancerShouldSelectOnlyClosedContainers()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- // make all containers open, balancer should not select any of them
- for (ContainerInfo containerInfo : cidToInfoMap.values()) {
- containerInfo.setState(HddsProtos.LifeCycleState.OPEN);
- }
balancerConfiguration.setThreshold(10);
- startBalancer(balancerConfiguration);
- sleepWhileBalancing(500);
- stopBalancer();
-
- // balancer should have identified unbalanced nodes
- Assertions.assertFalse(containerBalancer.getUnBalancedNodes().isEmpty());
- // no container should have been selected
- Assertions.assertTrue(containerBalancer.getContainerToSourceMap()
- .isEmpty());
- /*
- Iteration result should be CAN_NOT_BALANCE_ANY_MORE because no container
- move is generated
- */
- Assertions.assertEquals(
- ContainerBalancer.IterationResult.CAN_NOT_BALANCE_ANY_MORE,
- containerBalancer.getIterationResult());
-
- // now, close all containers
- for (ContainerInfo containerInfo : cidToInfoMap.values()) {
- containerInfo.setState(HddsProtos.LifeCycleState.CLOSED);
- }
- startBalancer(balancerConfiguration);
- sleepWhileBalancing(500);
- stopBalancer();
-
- // check whether all selected containers are closed
- for (ContainerID cid:
- containerBalancer.getContainerToSourceMap().keySet()) {
- Assertions.assertSame(
- cidToInfoMap.get(cid).getState(), HddsProtos.LifeCycleState.CLOSED);
- }
- }
-
- @Test
- public void containerBalancerShouldObeyMaxSizeToMoveLimit()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- balancerConfiguration.setThreshold(1);
- balancerConfiguration.setMaxSizeToMovePerIteration(10 * STORAGE_UNIT);
balancerConfiguration.setIterations(1);
- startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(500);
-
- // balancer should not have moved more size than the limit
- Assertions.assertFalse(
- containerBalancer.getSizeScheduledForMoveInLatestIteration() >
- 10 * STORAGE_UNIT);
-
- long size = containerBalancer.getMetrics()
- .getDataSizeMovedGBInLatestIteration();
- Assertions.assertTrue(size > 0);
- Assertions.assertFalse(size > 10);
- stopBalancer();
- }
-
- @Test
- public void targetDatanodeShouldNotAlreadyContainSelectedContainer()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- balancerConfiguration.setThreshold(10);
+ balancerConfiguration.setMaxSizeEnteringTarget(10 * STORAGE_UNIT);
balancerConfiguration.setMaxSizeToMovePerIteration(100 * STORAGE_UNIT);
balancerConfiguration.setMaxDatanodesPercentageToInvolvePerIteration(100);
- startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(1000);
-
- stopBalancer();
- Map<ContainerID, DatanodeDetails> map =
- containerBalancer.getContainerToTargetMap();
- for (Map.Entry<ContainerID, DatanodeDetails> entry : map.entrySet()) {
- ContainerID container = entry.getKey();
- DatanodeDetails target = entry.getValue();
- Assertions.assertTrue(cidToReplicasMap.get(container)
- .stream()
- .map(ContainerReplica::getDatanodeDetails)
- .noneMatch(target::equals));
- }
- }
+ balancerConfiguration.setMoveTimeout(Duration.ofMillis(1000));
- @Test
- public void containerMoveSelectionShouldFollowPlacementPolicy()
- throws IllegalContainerBalancerStateException, IOException,
- InvalidContainerBalancerConfigurationException, TimeoutException {
- balancerConfiguration.setThreshold(10);
- balancerConfiguration.setMaxSizeToMovePerIteration(50 * STORAGE_UNIT);
- balancerConfiguration.setMaxDatanodesPercentageToInvolvePerIteration(100);
- balancerConfiguration.setIterations(1);
startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(500);
-
- stopBalancer();
- Map<ContainerID, DatanodeDetails> containerFromSourceMap =
- containerBalancer.getContainerToSourceMap();
- Map<ContainerID, DatanodeDetails> containerToTargetMap =
- containerBalancer.getContainerToTargetMap();
-
- // for each move selection, check if {replicas - source + target}
- // satisfies placement policy
- for (Map.Entry<ContainerID, DatanodeDetails> entry :
- containerFromSourceMap.entrySet()) {
- ContainerID container = entry.getKey();
- DatanodeDetails source = entry.getValue();
-
- List<DatanodeDetails> replicas = cidToReplicasMap.get(container)
- .stream()
- .map(ContainerReplica::getDatanodeDetails)
- .collect(Collectors.toList());
- // remove source and add target
- replicas.remove(source);
- replicas.add(containerToTargetMap.get(container));
-
- ContainerInfo containerInfo = cidToInfoMap.get(container);
- ContainerPlacementStatus placementStatus =
- placementPolicy.validateContainerPlacement(replicas,
- containerInfo.getReplicationConfig().getRequiredNodes());
- Assertions.assertTrue(placementStatus.isPolicySatisfied());
- }
- }
-
- @Test
- public void targetDatanodeShouldBeInServiceHealthy()
- throws NodeNotFoundException, IllegalContainerBalancerStateException,
- IOException, InvalidContainerBalancerConfigurationException,
- TimeoutException {
- balancerConfiguration.setThreshold(10);
- balancerConfiguration.setMaxDatanodesPercentageToInvolvePerIteration(100);
- balancerConfiguration.setMaxSizeToMovePerIteration(50 * STORAGE_UNIT);
- balancerConfiguration.setMaxSizeEnteringTarget(50 * STORAGE_UNIT);
- balancerConfiguration.setIterations(1);
- startBalancer(balancerConfiguration);
-
- sleepWhileBalancing(500);
-
- stopBalancer();
- for (DatanodeDetails target : containerBalancer.getSelectedTargets()) {
- NodeStatus status = mockNodeManager.getNodeStatus(target);
- Assertions.assertSame(HddsProtos.NodeOperationalState.IN_SERVICE,
- status.getOperationalState());
- Assertions.assertTrue(status.isHealthy());
+ try {
+ containerBalancer.startBalancer(balancerConfiguration);
+ } catch (IllegalContainerBalancerStateException e) {
+ // start failed
+ Assertions.assertTrue(true);
Review Comment:
Do we want to assert another variable here?
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java:
##########
@@ -1137,45 +351,21 @@ public void stopBalancer()
TimeoutException {
lock.lock();
try {
- // should be leader, out of safe mode, and currently running
validateState(true);
- saveConfiguration(config, false, 0);
Review Comment:
saveConfiguration could end up happening outside lock if executed in the ContainerBalancerTask.
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancer.java:
##########
@@ -1137,45 +351,21 @@ public void stopBalancer()
TimeoutException {
lock.lock();
try {
- // should be leader, out of safe mode, and currently running
validateState(true);
- saveConfiguration(config, false, 0);
Review Comment:
We would need this change?
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/balancer/ContainerBalancerTask.java:
##########
@@ -0,0 +1,1009 @@
+/*
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.hdds.scm.container.balancer;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.conf.StorageUnit;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.scm.PlacementPolicyValidateProxy;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import org.apache.hadoop.hdds.scm.container.ContainerID;
+import org.apache.hadoop.hdds.scm.container.ContainerInfo;
+import org.apache.hadoop.hdds.scm.container.ContainerManager;
+import org.apache.hadoop.hdds.scm.container.ContainerNotFoundException;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeStat;
+import org.apache.hadoop.hdds.scm.container.replication.LegacyReplicationManager;
+import org.apache.hadoop.hdds.scm.container.replication.ReplicationManager;
+import org.apache.hadoop.hdds.scm.ha.SCMContext;
+import org.apache.hadoop.hdds.scm.net.NetworkTopology;
+import org.apache.hadoop.hdds.scm.node.DatanodeUsageInfo;
+import org.apache.hadoop.hdds.scm.node.NodeManager;
+import org.apache.hadoop.hdds.scm.node.states.NodeNotFoundException;
+import org.apache.hadoop.hdds.scm.server.StorageContainerManager;
+import org.apache.hadoop.ozone.OzoneConsts;
+import org.apache.hadoop.util.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableSet;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_NODE_REPORT_INTERVAL;
+import static org.apache.hadoop.hdds.HddsConfigKeys.HDDS_NODE_REPORT_INTERVAL_DEFAULT;
+
+/**
+ * Container balancer is a service in SCM to move containers between over- and
+ * under-utilized datanodes.
+ */
+public class ContainerBalancerTask implements Runnable {
+
+ public static final Logger LOG =
+ LoggerFactory.getLogger(ContainerBalancerTask.class);
+
+ private NodeManager nodeManager;
+ private ContainerManager containerManager;
+ private ReplicationManager replicationManager;
+ private OzoneConfiguration ozoneConfiguration;
+ private ContainerBalancer containerBalancer;
+ private final SCMContext scmContext;
+ private double threshold;
+ private int totalNodesInCluster;
+ private double maxDatanodesRatioToInvolvePerIteration;
+ private long maxSizeToMovePerIteration;
+ private int countDatanodesInvolvedPerIteration;
+ private long sizeScheduledForMoveInLatestIteration;
+ // count actual size moved in bytes
+ private long sizeActuallyMovedInLatestIteration;
+ private int iterations;
+ private List<DatanodeUsageInfo> unBalancedNodes;
+ private List<DatanodeUsageInfo> overUtilizedNodes;
+ private List<DatanodeUsageInfo> underUtilizedNodes;
+ private List<DatanodeUsageInfo> withinThresholdUtilizedNodes;
+ private Set<String> excludeNodes;
+ private Set<String> includeNodes;
+ private ContainerBalancerConfiguration config;
+ private ContainerBalancerMetrics metrics;
+ private long clusterCapacity;
+ private long clusterRemaining;
+ private double clusterAvgUtilisation;
+ private PlacementPolicyValidateProxy placementPolicyValidateProxy;
+ private NetworkTopology networkTopology;
+ private double upperLimit;
+ private double lowerLimit;
+ private ContainerBalancerSelectionCriteria selectionCriteria;
+ private volatile Status taskStatus = Status.RUNNING;
+
+ /*
+ Since a container can be selected only once during an iteration, these maps
+ use it as a primary key to track source to target pairings.
+ */
+ private final Map<ContainerID, DatanodeDetails> containerToSourceMap;
+ private final Map<ContainerID, DatanodeDetails> containerToTargetMap;
+
+ private Set<DatanodeDetails> selectedTargets;
+ private Set<DatanodeDetails> selectedSources;
+ private FindTargetStrategy findTargetStrategy;
+ private FindSourceStrategy findSourceStrategy;
+ private Map<ContainerMoveSelection,
+ CompletableFuture<LegacyReplicationManager.MoveResult>>
+ moveSelectionToFutureMap;
+ private IterationResult iterationResult;
+ private int nextIterationIndex;
+
+ /**
+ * Constructs ContainerBalancer with the specified arguments. Initializes
+ * ContainerBalancerMetrics. Container Balancer does not start on
+ * construction.
+ *
+ * @param scm the storage container manager
+ */
+ public ContainerBalancerTask(StorageContainerManager scm,
+ int nextIterationIndex,
+ ContainerBalancer containerBalancer,
+ ContainerBalancerMetrics metrics,
+ ContainerBalancerConfiguration config) {
+ this.nodeManager = scm.getScmNodeManager();
+ this.containerManager = scm.getContainerManager();
+ this.replicationManager = scm.getReplicationManager();
+ this.ozoneConfiguration = scm.getConfiguration();
+ this.containerBalancer = containerBalancer;
+ this.config = config;
+ this.metrics = metrics;
+ this.scmContext = scm.getScmContext();
+ this.overUtilizedNodes = new ArrayList<>();
+ this.underUtilizedNodes = new ArrayList<>();
+ this.withinThresholdUtilizedNodes = new ArrayList<>();
+ this.unBalancedNodes = new ArrayList<>();
+ this.placementPolicyValidateProxy = scm.getPlacementPolicyValidateProxy();
+ this.networkTopology = scm.getClusterMap();
+ this.nextIterationIndex = nextIterationIndex;
+ this.containerToSourceMap = new HashMap<>();
+ this.containerToTargetMap = new HashMap<>();
+ this.selectedSources = new HashSet<>();
+ this.selectedTargets = new HashSet<>();
+ findSourceStrategy = new FindSourceGreedy(nodeManager);
+ }
+
+ /**
+ * Balances the cluster in iterations. Regularly checks if balancing has
+ * been stopped.
+ */
+ public void run() {
+ try {
+ balancer();
+
+ // mark balancer completion, if ha and stopped as not a leader, it will
+ // be handled inside for not saving configuration with leader check
+ saveConfiguration(config, false, 0);
+ } catch (Throwable e) {
+ LOG.error("Container Balancer is stopped abnormally, ", e);
+ }
+ taskStatus = Status.STOPPED;
+ }
+
+ /**
+ * Tries to stop ContainerBalancer changing status to stopping. Calls
+ * {@link ContainerBalancerTask#stop()}.
+ */
+ public void stop() {
+ taskStatus = Status.STOPPING;
+ }
+
+ private void balancer() {
+ this.iterations = config.getIterations();
+ if (this.iterations == -1) {
+ //run balancer infinitely
+ this.iterations = Integer.MAX_VALUE;
+ }
+
+ // nextIterationIndex is the iteration that balancer should start from on
+ // leader change or restart
+ int i = nextIterationIndex;
+ for (; i < iterations && isBalancerRunning(); i++) {
+ // reset some variables and metrics for this iteration
+ resetState();
+
+ if (!isBalancerRunning()) {
+ return;
+ }
+
+ if (config.getTriggerDuEnable()) {
+ // before starting a new iteration, we trigger all the datanode
+ // to run `du`. this is an aggressive action, with which we can
+ // get more precise usage info of all datanodes before moving.
+ // this is helpful for container balancer to make more appropriate
+ // decisions. this will increase the disk io load of data nodes, so
+ // please enable it with caution.
+ nodeManager.refreshAllHealthyDnUsageInfo();
+ try {
+ long nodeReportInterval =
+ ozoneConfiguration.getTimeDuration(HDDS_NODE_REPORT_INTERVAL,
+ HDDS_NODE_REPORT_INTERVAL_DEFAULT, TimeUnit.MILLISECONDS);
+ // one for sending command , one for running du, and one for
+ // reporting back make it like this for now, a more suitable
+ // value. can be set in the future if needed
+ wait(3 * nodeReportInterval);
Review Comment:
I think it is a requirement to have wait inside synchronized block.
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