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From "Xuan Gong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1574) When RM transit from Active to Standby, the same eventDispatcher should not be registered more than once
Date Wed, 08 Jan 2014 18:50:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-1574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865741#comment-13865741
] 

Xuan Gong commented on YARN-1574:
---------------------------------

For example, we have two RMs, RM1 and RM2, and one NM. We do the following actions:
Set RM1 as Active --> Set RM1 as Standby --> Set RM1 as active.
After that, we can find that the same event : RMNodeEventType.STARTED will be handled twice.

{code}
14/01/08 10:39:20 INFO rmnode.RMNodeImpl: localhost:9105 Node Transitioned from NEW to RUNNING
14/01/08 10:39:20 ERROR rmnode.RMNodeImpl: Can't handle this event at current state
org.apache.hadoop.yarn.state.InvalidStateTransitonException: Invalid event: STARTED at RUNNING
	at org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:305)
	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.rmnode.RMNodeImpl.handle(RMNodeImpl.java:377)
	at org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeImpl.handle(RMNodeImpl.java:73)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$NodeEventDispatcher.handle(ResourceManager.java:731)
	at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$NodeEventDispatcher.handle(ResourceManager.java:715)
	at org.apache.hadoop.yarn.event.AsyncDispatcher$MultiListenerHandler.handle(AsyncDispatcher.java:264)
	at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173)
	at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106)
	at java.lang.Thread.run(Thread.java:695)
{code}

> When RM transit from Active to Standby, the same eventDispatcher should not be registered
more than once
> --------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-1574
>                 URL: https://issues.apache.org/jira/browse/YARN-1574
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Xuan Gong
>            Assignee: Xuan Gong
>            Priority: Blocker
>
> Currently, we move rmDispatcher out of ActiveService. But we still register the Event
dispatcher, such as schedulerDispatcher, RMAppEventDispatcher when we initiate the ActiveService.
> Almost every time when we transit RM from Active to Standby,  we need to initiate the
ActiveService. That means we will register the same event Dispatcher which will cause the
same event will be handled several times.



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