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https://issues.apache.org/jira/browse/YARN-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635892#comment-14635892
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Anubhav Dhoot commented on YARN-3878:
-------------------------------------
Agree this is ok to ignore
> AsyncDispatcher can hang while stopping if it is configured for draining
> events on stop
> ---------------------------------------------------------------------------------------
>
> Key: YARN-3878
> URL: https://issues.apache.org/jira/browse/YARN-3878
> Project: Hadoop YARN
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Varun Saxena
> Assignee: Varun Saxena
> Priority: Critical
> Fix For: 2.7.2
>
> Attachments: YARN-3878.01.patch, YARN-3878.02.patch,
> YARN-3878.03.patch, YARN-3878.04.patch, YARN-3878.05.patch,
> YARN-3878.06.patch, YARN-3878.07.patch, YARN-3878.08.patch,
> YARN-3878.09.patch, YARN-3878.09_reprorace.pat_h
>
>
> The sequence of events is as under :
> # RM is stopped while putting a RMStateStore Event to RMStateStore's
> AsyncDispatcher. This leads to an Interrupted Exception being thrown.
> # As RM is being stopped, RMStateStore's AsyncDispatcher is also stopped. On
> {{serviceStop}}, we will check if all events have been drained and wait for
> event queue to drain(as RM State Store dispatcher is configured for queue to
> drain on stop).
> # This condition never becomes true and AsyncDispatcher keeps on waiting
> incessantly for dispatcher event queue to drain till JVM exits.
> *Initial exception while posting RM State store event to queue*
> {noformat}
> 2015-06-27 20:08:35,922 DEBUG [main] service.AbstractService
> (AbstractService.java:enterState(452)) - Service: Dispatcher entered state
> STOPPED
> 2015-06-27 20:08:35,923 WARN [AsyncDispatcher event handler]
> event.AsyncDispatcher (AsyncDispatcher.java:handle(247)) - AsyncDispatcher
> thread interrupted
> java.lang.InterruptedException
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1219)
> at
> java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:340)
> at
> java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:338)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$GenericEventHandler.handle(AsyncDispatcher.java:244)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.updateApplicationAttemptState(RMStateStore.java:652)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.rememberTargetTransitionsAndStoreState(RMAppAttemptImpl.java:1173)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.access$3300(RMAppAttemptImpl.java:109)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$ContainerFinishedTransition.transition(RMAppAttemptImpl.java:1650)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl$ContainerFinishedTransition.transition(RMAppAttemptImpl.java:1619)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$MultipleInternalArc.doTransition(StateMachineFactory.java:385)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:786)
> at
> org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.handle(RMAppAttemptImpl.java:108)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$ApplicationAttemptEventDispatcher.handle(ResourceManager.java:838)
> {noformat}
> *JStack of AsyncDispatcher hanging on stop*
> {noformat}
> "AsyncDispatcher event handler" prio=10 tid=0x00007fb980222800 nid=0x4b1e
> waiting on condition [0x00007fb9654e9000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x0000000700b79250> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:113)
> at java.lang.Thread.run(Thread.java:744)
> "main" prio=10 tid=0x00007fb98000a800 nid=0x49c3 in Object.wait()
> [0x00007fb989851000]
> java.lang.Thread.State: TIMED_WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x0000000700b79430> (a java.lang.Object)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher.serviceStop(AsyncDispatcher.java:156)
> - locked <0x0000000700b79430> (a java.lang.Object)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> - locked <0x0000000700b79420> (a java.lang.Object)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.serviceStop(RMStateStore.java:515)
> at
> org.apache.hadoop.service.AbstractService.stop(AbstractService.java:221)
> - locked <0x0000000700b79630> (a java.lang.Object)
> at
> org.apache.hadoop.service.AbstractService.close(AbstractService.java:250)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceStop(ResourceManager.java:599)
> {noformat}
> We keep on getting below logs
> {noformat}
> 2015-06-27 20:08:35,926 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(140)) - AsyncDispatcher is draining to
> stop, igonring any new events.
> 2015-06-27 20:08:36,926 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:37,927 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:38,927 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:39,928 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:40,929 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:41,929 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:42,930 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:43,930 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:44,931 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:45,931 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> 2015-06-27 20:08:46,932 INFO [main] event.AsyncDispatcher
> (AsyncDispatcher.java:serviceStop(144)) - Waiting for AsyncDispatcher to
> drain. Thread state is :WAITING
> {noformat}
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