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Date: Tue, 17 Jul 2012 15:13:35 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4448) Nodemanager crashes upon
 application cleanup if aggregation failed to start
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416277#comment-13416277 ] 

Daryn Sharp commented on MAPREDUCE-4448:
----------------------------------------

Just noticed there's a race condition that can cause a NPE.  There is a {{containsKey(appid}} followed by {{get(appid}}.  If the aggregator fails and removes itself from the map between those two calls, the NM goes down again.
                
> Nodemanager crashes upon application cleanup if aggregation failed to start
> ---------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4448
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4448
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, nodemanager
>    Affects Versions: 0.23.3, 2.0.1-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4448.patch
>
>
> When log aggregation is enabled, the nodemanager can crash if log aggregation for an application failed to start.

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