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