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From "Jonathan Eagles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4194) ConcurrentModificationError in DirectoryCollection
Date Wed, 25 Apr 2012 01:42:05 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261206#comment-13261206
] 

Jonathan Eagles commented on MAPREDUCE-4194:
--------------------------------------------

MAPREDUCE-4189 covers TestContainerManagerSecurity and also shows the other test failures
and preexisting.
                
> ConcurrentModificationError in DirectoryCollection
> --------------------------------------------------
>
>                 Key: MAPREDUCE-4194
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4194
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.3, 2.0.0
>            Reporter: Jonathan Eagles
>            Assignee: Jonathan Eagles
>         Attachments: MAPREDUCE-4194.patch
>
>
> As found as part of work on MAPREDUCE-4169, it is possible for a ConcurrentModificationException
to be thrown upon disk failure. DirectoryCollection hands out its internal list structure
that is accessed across multiple threads. Upon disk failure its internal list is modified,
invalidating all current iterators to that structure.

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