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