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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7529) Possible deadlock in metrics2
Date Tue, 09 Aug 2011 00:50:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13081342#comment-13081342
] 

Luke Lu commented on HADOOP-7529:
---------------------------------

Though it's unlikely to happen in practice (metrics system initialization usually doesn't
overlap with metrics source registration), it's probably worth fixing for posterity. The v1
patch make metrics impl in the DefaultMetricsSystem an AtomicReference.

> Possible deadlock in metrics2
> -----------------------------
>
>                 Key: HADOOP-7529
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7529
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.23.0
>            Reporter: Todd Lipcon
>            Assignee: Luke Lu
>            Priority: Critical
>             Fix For: 0.23.0
>
>         Attachments: hadoop-7529-v1.patch, metrics-deadlock.png
>
>
> Lock cycle detected by jcarder between MetricsSystemImpl and DefaultMetricsSystem

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