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Date: Mon, 24 Jul 2017 05:25:01 +0000 (UTC)
From: "Sunil G (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.13035446.1484645789000.312783.1500873901890@Atlassian.JIRA>
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References: <JIRA.13035446.1484645789000@Atlassian.JIRA> <JIRA.13035446.1484645789578@jira-lw-us.apache.org>
Subject: [jira] [Commented] (YARN-6102) On failover RM can crash due to
 unregistered event to AsyncDispatcher
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archived-at: Mon, 24 Jul 2017 05:25:11 -0000


    [ https://issues.apache.org/jira/browse/YARN-6102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16097969#comment-16097969 ] 

Sunil G commented on YARN-6102:
-------------------------------

+1 . Committing shortly if there are no objections.

> On failover RM can crash due to unregistered event to AsyncDispatcher
> ---------------------------------------------------------------------
>
>                 Key: YARN-6102
>                 URL: https://issues.apache.org/jira/browse/YARN-6102
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.8.0, 2.7.3
>            Reporter: Ajith S
>            Assignee: Rohith Sharma K S
>            Priority: Critical
>         Attachments: eventOrder.JPG, YARN-6102.01.patch, YARN-6102.02.patch, YARN-6102.03.patch, YARN-6102.04.patch, YARN-6102.05.patch, YARN-6102.06.patch, YARN-6102.07.patch
>
>
> {code}2017-01-17 16:42:17,911 FATAL [AsyncDispatcher event handler] event.AsyncDispatcher (AsyncDispatcher.java:dispatch(200)) - Error in dispatcher thread
> java.lang.Exception: No handler for registered for class org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNodeEventType
>         at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:196)
>         at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:120)
>         at java.lang.Thread.run(Thread.java:745)
> 2017-01-17 16:42:17,914 INFO  [AsyncDispatcher ShutDown handler] event.AsyncDispatcher (AsyncDispatcher.java:run(303)) - Exiting, bbye..{code}
> The same stack i was also noticed in {{TestResourceTrackerOnHA}} exits abnormally, after some analysis, i was able to reproduce.
> Once the nodeHeartBeat is sent to RM, inside {{org.apache.hadoop.yarn.server.resourcemanager.ResourceTrackerService.nodeHeartbeat(NodeHeartbeatRequest)}}, before sending it to dispatcher through
> {{this.rmContext.getDispatcher().getEventHandler().handle(nodeStatusEvent);}} if RM failover is called, the dispatcher is reset
> The new dispatcher is however first started and then the events are registered at {{org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.reinitialize(boolean)}}
> So event order will look like
> 1. Send Node heartbeat to {{ResourceTrackerService}}
> 2. In {{ResourceTrackerService.nodeHeartbeat}}, before passing to dispatcher call RM failover
> 3. In RM Failover, current active will reset dispatcher @reinitialize i.e ( {{resetDispatcher();}} + {{createAndInitActiveServices();}} )
> Now between {{resetDispatcher();}} and {{createAndInitActiveServices();}} , the {{ResourceTrackerService.nodeHeartbeat}} invokes dipatcher
> This will cause the above error as at point of time when {{STATUS_UPDATE}} event is given to dispatcher in {{ResourceTrackerService}} , the new dispatcher(from the failover) may be started but not yet registered for events
> Using same steps(with pausing JVM at debug), i was able to reproduce this in production cluster also. for {{STATUS_UPDATE}} active service event, when the service is yet to forward the event to RM dispatcher but a failover is called and dispatcher reset is between {{resetDispatcher();}} & {{createAndInitActiveServices();}}


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