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Date: Mon, 9 Aug 2010 07:05:16 -0400 (EDT)
From: "Ranjit Mathew (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1961) [gridmix3]
 ConcurrentModificationException when shutting down Gridmix
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896501#action_12896501 ] 

Ranjit Mathew commented on MAPREDUCE-1961:
------------------------------------------

+1 for the patch.

> [gridmix3] ConcurrentModificationException when shutting down Gridmix
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1961
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1961
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/gridmix
>            Reporter: Hong Tang
>            Assignee: Hong Tang
>         Attachments: mr-1961-20100723.patch
>
>
> We observed the following exception occasionally at the end of the Gridmix run:
> {code}
> Exception in thread "StatsCollectorThread" java.util.ConcurrentModificationException
>           at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
>           at java.util.AbstractList$Itr.next(AbstractList.java:343)
>           at org.apache.hadoop.mapred.gridmix.Statistics$StatCollector.updateAndNotifyClusterStatsListeners(Statistics.java:220)
>           at org.apache.hadoop.mapred.gridmix.Statistics$StatCollector.run(Statistics.java:205)
> {code}

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