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Date: Wed, 24 Oct 2012 18:04:13 +0000 (UTC)
From: "Vinod Kumar Vavilapalli (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: <2012185404.22904.1351101853261.JavaMail.jiratomcat@arcas>
In-Reply-To: <941506339.61041.1350517083401.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (MAPREDUCE-4730) AM crashes due to OOM while
 serving up map task completion events
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483435#comment-13483435 ] 

Vinod Kumar Vavilapalli commented on MAPREDUCE-4730:
----------------------------------------------------

I was thinking that the connection timeouts are unrelated to HADOOP-8942.

You are right, AMScalability only runs maps, so there is no chance to uncover this issue.

Are these socket timeout exceptions? I remember running into those with gridmix, but never got around to the bottom of that because of more pressing concerns.
                
> 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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