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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4035) LightWeightGSet and LightWeightHashSet increment a volatile without synchronization
Date Thu, 11 Oct 2012 00:01:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4035?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins updated HDFS-4035:
------------------------------

    Status: Patch Available  (was: Open)
    
> LightWeightGSet and LightWeightHashSet increment a volatile without synchronization
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-4035
>                 URL: https://issues.apache.org/jira/browse/HDFS-4035
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hdfs-4035.txt
>
>
> LightWeightGSet and LightWeightHashSet have a volatile modification field that they use
to detect updates while iterating so they can throw a ConcurrentModificationException. Since
these "LightWeight" classes are explicitly "not thread safe" (eg access to their members is
not synchronized) then the current use is OK, we just need to update findbugsExcludeFile.xml
to exclude them.
>   

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