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From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4226) ConcurrentModificationException in FileSystemCounterGroup
Date Mon, 07 May 2012 15:50:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269713#comment-13269713
] 

Tom White commented on MAPREDUCE-4226:
--------------------------------------

I'm not sure if this is a problem in practice since counters are all written together, and
o.a.h.mapreduce.counters.AbstractCounters#write() is synchronized, as is findCounter() which
is used to access and increment framework counters (e.g. in FileSystemStatisticUpdater). So
I think we can commit this as an incremental improvement, and follow up with another JIRA
if there does turn out to be a problem with synchronization on FileSystemCounterGroup or FrameworkCounterGroup.
Does that sound reasonable?
                
> ConcurrentModificationException in FileSystemCounterGroup
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-4226
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4226
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Tom White
>            Assignee: Tom White
>         Attachments: MAPREDUCE-4226.patch
>
>
> This was seen in a Hive job. I'll attach a failing test case.

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