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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9980) LightWeightGSet's modification field should be volatile so that detect changes by other thread in iteration.
Date Fri, 27 Sep 2013 05:55:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13779686#comment-13779686
] 

Chris Nauroth commented on HADOOP-9980:
---------------------------------------

Yes, that makes sense.  I think this would move to an HDFS issue too, because the patch would
only touch files in HDFS.  Thanks, Junping.
                
> LightWeightGSet's modification field should be volatile so that detect changes by other
thread in iteration.
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9980
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9980
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: util
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 2.3.0
>
>         Attachments: HADOOP-9980.patch
>
>
> LightWeightGSet should have a volatile modification field (like: LightWeightHashSet or
LightWeightLinkedSet) that is used to detect updates while iterating so they can throw a ConcurrentModificationException.

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