[
https://issues.apache.org/jira/browse/FLINK-29234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17602689#comment-17602689
]
Yu Wang edited comment on FLINK-29234 at 9/10/22 9:47 AM:
----------------------------------------------------------
[~martijnvisser] I think this issue still exists in the master branch. The
issue is caused by the ordering of Flink to get the lock.
In this line, the class *DefaultLeaderElectionService* will try to get the lock
of itself, then invoke the method of
*leaderContender(which is JobMasterServiceLeaderShipRunner in this case).*
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/leaderelection/DefaultLeaderElectionService.java#L204]
So the order of getting locks is
# DefaultLeaderElectionService
# JobMasterServiceLeaderShipRunner{*}{*}
And in this line *JobMasterServiceLeaderShipRunner* will try to get the lock of
itself, then invoke the method of *leaderElectionService(which is*
{*}DefaultLeaderElectionService in this case{*}{*}).{*}
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/JobMasterServiceLeadershipRunner.java#L148]
So the order of getting the locks is
# JobMasterServiceLeaderShipRunner
# DefaultLeaderElectionService
So if these two functions are invoked nearly at the same time, it will cause
the dead lock issue.
was (Author: lucentwong):
[~martijnvisser] I think this issue still exists in the master branch. The
issue is caused by the ordering of Flink to get the lock.
In this line, the class *DefaultLeaderElectionService* will try to get the lock
of itself, then invoke the method of
*leaderContender(which is JobMasterServiceLeaderShipRunner in this case).*
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/leaderelection/DefaultLeaderElectionService.java#L204]
So the order of getting locks is
# DefaultLeaderElectionService
# JobMasterServiceLeaderShipRunner{*}{*}
And in this line *JobMasterServiceLeaderShipRunner* will try to get the lock of
itself, then invoke the method of *leaderElectionService(which is*
{*}DefaultLeaderElectionService in this case{*}{*}).{*}
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/jobmaster/JobMasterServiceLeadershipRunner.java#L148]
So the order of getting the locks is
# JobMasterServiceLeaderShipRunner
# DefaultLeaderElectionService
So if these two functions are invoked nearly at the same time, it will cause
the dead lock issue.
> Dead lock in DefaultLeaderElectionService
> -----------------------------------------
>
> Key: FLINK-29234
> URL: https://issues.apache.org/jira/browse/FLINK-29234
> Project: Flink
> Issue Type: Bug
> Components: Runtime / Coordination
> Affects Versions: 1.13.5
> Reporter: Yu Wang
> Priority: Critical
>
> Jobmanager stop working because the deadlock in DefaultLeaderElectionService.
> The log stopped at
> {code:java}
> org.apache.flink.runtime.leaderelection.DefaultLeaderElectionService [] -
> Stopping DefaultLeaderElectionService. {code}
> Which may similar to this ticket
> https://issues.apache.org/jira/browse/FLINK-20008
> Here is the jstack info
> {code:java}
> Found one Java-level deadlock: =============================
> "flink-akka.actor.default-dispatcher-18": waiting to lock monitor
> 0x00007f15c7eae3a8 (object 0x0000000678d395e8, a java.lang.Object), which is
> held by "main-EventThread" "main-EventThread": waiting to lock monitor
> 0x00007f15a3811258 (object 0x0000000678cf1be0, a java.lang.Object), which is
> held by "flink-akka.actor.default-dispatcher-18" Java stack information for
> the threads listed above: ===================================================
> "flink-akka.actor.default-dispatcher-18": at
> org.apache.flink.runtime.leaderelection.DefaultLeaderElectionService.stop(DefaultLeaderElectionService.java:104)
> - waiting to lock <0x0000000678d395e8> (a java.lang.Object) at
> org.apache.flink.runtime.jobmaster.JobMasterServiceLeadershipRunner.lambda$closeAsync$0(JobMasterServiceLeadershipRunner.java:147)
> at
> org.apache.flink.runtime.jobmaster.JobMasterServiceLeadershipRunner$$Lambda$735/1742012752.run(Unknown
> Source) at
> org.apache.flink.runtime.concurrent.FutureUtils.lambda$runAfterwardsAsync$18(FutureUtils.java:687)
> at
> org.apache.flink.runtime.concurrent.FutureUtils$$Lambda$736/6716561.accept(Unknown
> Source) at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
> at
> java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
> at
> java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456)
> at
> org.apache.flink.runtime.concurrent.DirectExecutorService.execute(DirectExecutorService.java:217)
> at
> java.util.concurrent.CompletableFuture$UniCompletion.claim(CompletableFuture.java:543)
> at
> java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:765)
> at
> java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
> at
> java.util.concurrent.CompletableFuture.uniWhenCompleteStage(CompletableFuture.java:795)
> at
> java.util.concurrent.CompletableFuture.whenCompleteAsync(CompletableFuture.java:2163)
> at
> org.apache.flink.runtime.concurrent.FutureUtils.runAfterwardsAsync(FutureUtils.java:684)
> at
> org.apache.flink.runtime.concurrent.FutureUtils.runAfterwards(FutureUtils.java:651)
> at
> org.apache.flink.runtime.jobmaster.JobMasterServiceLeadershipRunner.closeAsync(JobMasterServiceLeadershipRunner.java:143)
> - locked <0x0000000678cf1be0> (a java.lang.Object) at
> org.apache.flink.runtime.dispatcher.Dispatcher.terminateJob(Dispatcher.java:807)
> at
> org.apache.flink.runtime.dispatcher.Dispatcher.terminateRunningJobs(Dispatcher.java:799)
> at
> org.apache.flink.runtime.dispatcher.Dispatcher.terminateRunningJobsAndGetTerminationFuture(Dispatcher.java:812)
> at
> org.apache.flink.runtime.dispatcher.Dispatcher.onStop(Dispatcher.java:268) at
> org.apache.flink.runtime.rpc.RpcEndpoint.internalCallOnStop(RpcEndpoint.java:214)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor$StartedState.terminate(AkkaRpcActor.java:563)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleControlMessage(AkkaRpcActor.java:186)
> at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor$$Lambda$444/1289054037.apply(Unknown
> Source) at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26) at
> akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21) at
> scala.PartialFunction.applyOrElse(PartialFunction.scala:123) at
> scala.PartialFunction.applyOrElse$(PartialFunction.scala:122) at
> akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21) at
> scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171) at
> scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172) at
> akka.actor.Actor.aroundReceive(Actor.scala:517) at
> akka.actor.Actor.aroundReceive$(Actor.scala:515) at
> akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225) at
> akka.actor.ActorCell.receiveMessage(ActorCell.scala:592) at
> akka.actor.ActorCell.invoke(ActorCell.scala:561) at
> akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258) at
> akka.dispatch.Mailbox.run(Mailbox.scala:225) at
> akka.dispatch.Mailbox.exec(Mailbox.scala:235) at
> akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at
> akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
> at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at
> akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
>
> "main-EventThread": at
> org.apache.flink.runtime.jobmaster.JobMasterServiceLeadershipRunner.runIfStateRunning(JobMasterServiceLeadershipRunner.java:468)
> - waiting to lock <0x0000000678cf1be0> (a java.lang.Object) at
> org.apache.flink.runtime.jobmaster.JobMasterServiceLeadershipRunner.grantLeadership(JobMasterServiceLeadershipRunner.java:248)
> at
> org.apache.flink.runtime.leaderelection.DefaultLeaderElectionService.onGrantLeadership(DefaultLeaderElectionService.java:211)
> - locked <0x0000000678d395e8> (a java.lang.Object) at
> org.apache.flink.runtime.leaderelection.ZooKeeperLeaderElectionDriver.isLeader(ZooKeeperLeaderElectionDriver.java:166)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:693)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:689)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:100)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.shaded.com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.listen.ListenerContainer.forEach(ListenerContainer.java:92)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch.setLeadership(LeaderLatch.java:688)
> - locked <0x0000000678d39788> (a
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch.checkLeadership(LeaderLatch.java:567)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch.access$700(LeaderLatch.java:65)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.recipes.leader.LeaderLatch$7.processResult(LeaderLatch.java:618)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:883)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:653)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:152)
> at
> org.apache.flink.shaded.curator4.org.apache.curator.framework.imps.GetChildrenBuilderImpl$2.processResult(GetChildrenBuilderImpl.java:187)
> at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:601)
> at
> org.apache.flink.shaded.zookeeper3.org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:508)
> {code}
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