[jira] Commented: (MAPREDUCE-1961) [gridmix3] ConcurrentModificationException when shutting down Gridmix

["Hong Tang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891431#action_12891431 ] 

Hong Tang commented on MAPREDUCE-1961:
--------------------------------------

It seems that StatsCollectorThread is still active when we call "clusterStatlisteners.clear();" from "Statistics.shutdown()".

A simple fix is to replace "clusterStatlisteners.clear();" with "lusterStatlisteners = new ArrayList<StatListener<ClusterStats>>()".

While we are at it, we probably should also fix the same problem with jobStatListeners.

> [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
>            Reporter: Hong Tang
>
> 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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