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https://issues.apache.org/jira/browse/HADOOP-6939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966729#action_12966729
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Hudson commented on HADOOP-6939:
--------------------------------
Integrated in Hadoop-Common-trunk-Commit #451 (See
[https://hudson.apache.org/hudson/job/Hadoop-Common-trunk-Commit/451/])
HADOOP-6939. Inconsistent lock ordering in
AbstractDelegationTokenSecretManager. Contributed by Todd Lipcon.
> Inconsistent lock ordering in AbstractDelegationTokenSecretManager
> ------------------------------------------------------------------
>
> Key: HADOOP-6939
> URL: https://issues.apache.org/jira/browse/HADOOP-6939
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 0.22.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: 0.23.0
>
> Attachments: HADOOP-6939.patch, hadoop-6939.txt, lockorder.png
>
>
> AbstractDelegationTokenSecretManager.startThreads() is synchronized, which
> calls updateCurrentKey(), which calls logUpdateMasterKey.
> logUpdateMasterKey's implementation for HDFS's manager calls
> namesystem.logUpdateMasterKey() which is synchronized. Thus the lock order is
> ADTSM -> FSN. In FSN.saveNamespace, though, it calls
> DTSM.saveSecretManagerState(), so the lock order is FSN -> ADTSM.
> I don't think this deadlock occurs in practice since saveNamespace won't
> occur until after the ADTSM has started its threads, but should be fixed
> anyway.
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