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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5267) Modification field in LightWeightHashSet and LightWeightLinkedSet should't be volatile which cause wrong expectation on thread-safe visibility
Date Fri, 27 Sep 2013 06:26:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13779719#comment-13779719
] 

Junping Du commented on HDFS-5267:
----------------------------------

Thanks Chris for confirmation. Already move to HDFS and deliver a quick patch for it. LightWeightLinkedSet
inherit "modification" field from LightWeightHashSet, so only one tiny change here.
                
> Modification field in LightWeightHashSet and LightWeightLinkedSet should't be volatile
which cause wrong expectation on thread-safe visibility
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5267
>                 URL: https://issues.apache.org/jira/browse/HDFS-5267
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 2.3.0
>
>         Attachments: HADOOP-9980.patch, HDFS-5276.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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