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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9504) create metricsRateAttributeMod with ConcurrentHashMap to avoid hashmap concurrent race
Date Thu, 25 Apr 2013 21:12:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642223#comment-13642223
] 

Elliott Clark commented on HADOOP-9504:
---------------------------------------

Any chance of getting whichever fix is best backported to branch-1 ?  For HBase this can really
put a regionserver into a world of hurt.  And there are still a fair number of hbase users
on older branches.  Seems like a 1.0.5 and/or 1.1.3 release would be helpful for users.
                
> create metricsRateAttributeMod with ConcurrentHashMap to avoid hashmap concurrent race
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9504
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9504
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 3.0.0, 2.0.3-alpha
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>            Priority: Critical
>         Attachments: HADOOP-9504.txt
>
>
> Please see HBASE-8416 for detail information.
> we need to take care of the synchronization for HashMap put(), otherwise it may lead
to spin loop.

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