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From "Hitesh Shah (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2693) NPE in AM causes it to lose containers which are never returned back to RM
Date Fri, 14 Oct 2011 23:30:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hitesh Shah updated MAPREDUCE-2693:
-----------------------------------

    Attachment: MR-2693.1.patch
    
> NPE in AM causes it to lose containers which are never returned back to RM
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2693
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2693
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: Amol Kekre
>            Assignee: Hitesh Shah
>            Priority: Critical
>             Fix For: 0.23.0
>
>         Attachments: MR-2693.1.patch
>
>
> The following exception in AM of an application at the top of queue causes this. Once
this happens, AM keeps obtaining
> containers from RM and simply loses them. Eventually on a cluster with multiple jobs,
no more scheduling happens
> because of these lost containers.
> It happens when there are blacklisted nodes at the app level in AM. A bug in AM
> (RMContainerRequestor.containerFailedOnHost(hostName)) is causing this - nodes are simply
getting removed from the
> request-table. We should make sure RM also knows about this update.
> ========================================================================
> 11/06/17 06:11:18 INFO rm.RMContainerAllocator: Assigned based on host match 98.138.163.34
> 11/06/17 06:11:18 INFO rm.RMContainerRequestor: BEFORE decResourceRequest: applicationId=30
priority=20
> resourceName=... numContainers=4978 #asks=5
> 11/06/17 06:11:18 INFO rm.RMContainerRequestor: AFTER decResourceRequest: applicationId=30
priority=20
> resourceName=... numContainers=4977 #asks=5
> 11/06/17 06:11:18 INFO rm.RMContainerRequestor: BEFORE decResourceRequest: applicationId=30
priority=20
> resourceName=... numContainers=1540 #asks=5
> 11/06/17 06:11:18 INFO rm.RMContainerRequestor: AFTER decResourceRequest: applicationId=30
priority=20
> resourceName=... numContainers=1539 #asks=6
> 11/06/17 06:11:18 ERROR rm.RMContainerAllocator: ERROR IN CONTACTING RM. 
> java.lang.NullPointerException
>         at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerRequestor.decResourceRequest(RMContainerRequestor.java:246)
>         at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerRequestor.decContainerReq(RMContainerRequestor.java:198)
>         at
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator$ScheduledRequests.assign(RMContainerAllocator.java:523)
>         at
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator$ScheduledRequests.access$200(RMContainerAllocator.java:433)
>         at org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator.heartbeat(RMContainerAllocator.java:151)
>         at org.apache.hadoop.mapreduce.v2.app.rm.RMCommunicator$1.run(RMCommunicator.java:220)
>         at java.lang.Thread.run(Thread.java:619)

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