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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4730) AM crashes due to OOM while serving up map task completion events
Date Wed, 24 Oct 2012 16:32:13 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Lowe updated MAPREDUCE-4730:
----------------------------------

    Status: Open  (was: Patch Available)

Thanks for the review, Vinod.  I'll work on a test case for EventFetcher.

bq. I don't remember us running into it when we ran AMScalability. Can you file a bug, more
details will be great to have.

I'll run the test case again and see if I can get more details on what is causing the connect
timeouts for tasks when they are launched en-masse.  Is AMScalability capable of emulating
the kind of simultaneous connect storm that a large cluster will exhibit?
                
> AM crashes due to OOM while serving up map task completion events
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-4730
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4730
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mrv2
>    Affects Versions: 0.23.3
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>         Attachments: MAPREDUCE-4730.patch, MAPREDUCE-4730.patch
>
>
> We're seeing a repeatable OOM crash in the AM for a task with around 30000 maps and 3000
reducers.  Details to follow.

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