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https://issues.apache.org/jira/browse/YARN-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14617944#comment-14617944
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Devaraj K commented on YARN-3878:
---------------------------------
bq. Given dispatcher is a sensitive piece of code, waiting 2-3 seconds in test
is ok to me too.
It is ok for me too.
If we want have a more reliable way to know that whether thread is started or
not, we can have a protected and test scoped method which just returns the
eventHandlingThread state(or tells whether thread is started or not) and then
we can wait in the test till the eventHandlingThread has started. I think this
may not be required for dispatcher eventHandlingThread and waiting for 2-3
seconds would be ok.
> 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
> 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
>
>
> 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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