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https://issues.apache.org/jira/browse/STORM-660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14312375#comment-14312375
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Robert Joseph Evans commented on STORM-660:
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The question is should we make the OutputCollector thread safe? Is the
overhead of grabbing a lock with no contention enough of a hit that we don't
want to do it in the common case, instead rely on on end users to continually
make this mistake and fix it themselves. I personally think the overhead is so
small it should not be that big of a problem.
> IndexOutOfBoundsException with shuffle grouping and a large number of
> paralleliziation hint
> ---------------------------------------------------------------------------------------------
>
> Key: STORM-660
> URL: https://issues.apache.org/jira/browse/STORM-660
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 0.10.0
> Environment: Linux
> Reporter: clay teahouse
>
> Storm throws IndexOutOfBoundsException error once in a while, when a bolt
> with shuffle grouping to is linked its predecessor bolt.especially with a
> high paralleliziation hint.
> This was reported as a bug with the previous versions of storm as well.
> http://stackoverflow.com/questions/19632287/indexoutofboundsexception-in-shuffle-grouping
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