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From "Vinod Kumar Vavilapalli (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3749) ConcurrentModificationException in counter groups
Date Tue, 07 Feb 2012 02:22:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202005#comment-13202005
] 

Vinod Kumar Vavilapalli commented on MAPREDUCE-3749:
----------------------------------------------------

Tom, FYI, we found that the extra copy is indeed a problem as we ran into performance issues
while running benchmarks. I created MAPREDUCE-3827 to instead use a Concurrent HashMap and
give a fail-safe weakly consistent iterator.
                
> ConcurrentModificationException in counter groups
> -------------------------------------------------
>
>                 Key: MAPREDUCE-3749
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3749
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Tom White
>            Assignee: Tom White
>            Priority: Blocker
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3749-concurrent.patch, MAPREDUCE-3749-test.patch, MAPREDUCE-3749.patch,
MAPREDUCE-3749.patch
>
>
> Iterating over a counter's groups while adding more groups will cause a ConcurrentModificationException.
> This was found while running Hive unit tests against a recent 0.23 version.

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