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https://issues.apache.org/jira/browse/HADOOP-6269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772607#action_12772607
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Todd Lipcon commented on HADOOP-6269:
-------------------------------------
New patch looks good to me. +1 for the simpler approach
> Missing synchronization for defaultResources in Configuration.addResource
> -------------------------------------------------------------------------
>
> Key: HADOOP-6269
> URL: https://issues.apache.org/jira/browse/HADOOP-6269
> Project: Hadoop Common
> Issue Type: Bug
> Components: conf
> Affects Versions: 0.20.1
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.20.2, 0.21.0
>
> Attachments: HADOOP-6269-1.patch, HADOOP-6269-2.patch,
> hadoop-6269.txt, hadoop-6269.txt
>
>
> Configuration.defaultResources is a simple ArrayList. In two places in
> Configuration it is accessed without appropriate synchronization, which we've
> seen to occasionally result in ConcurrentModificationExceptions.
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