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From "Devaraj K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3878) AsyncDispatcher can hang while stopping if it is configured for draining events on stop
Date Mon, 06 Jul 2015 04:59:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-3878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614538#comment-14614538
] 

Devaraj K commented on YARN-3878:
---------------------------------

Adding to [~kasha] comment,

1. Can you add @VisibleForTesting annotation to this method?
{code:xml}
+  protected boolean hasPendingEvents() {
+    return !eventQueue.isEmpty();
+  }
+
{code}

2. I don't convince that it is a right way to modify the source code and add a public method
for test purpose. For waiting to start the AsyncDispatcher, can't we do like below similar
to the way we do in other tests for waiting to change the service state?

{code:xml}
    int waitCount = 0;
    while (disp.getServiceState() != STATE.STARTED
        && waitCount++ < 60) {
      Thread.sleep(1500);
    }
{code}

> 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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