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https://issues.apache.org/jira/browse/HDFS-863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981022#action_12981022
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Konstantin Shvachko commented on HDFS-863:
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Is it actually breaking builds at this point? Does findbugs raises warnings
about it? If so we should mark it a blocker.
> Potential deadlock in TestOverReplicatedBlocks
> ----------------------------------------------
>
> Key: HDFS-863
> URL: https://issues.apache.org/jira/browse/HDFS-863
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Reporter: Todd Lipcon
> Fix For: 0.22.0
>
> Attachments: cycle.png, TestNodeCount.png
>
>
> TestOverReplicatedBlocks.testProcesOverReplicateBlock synchronizes on
> namesystem.heartbeats without synchronizing on namesystem first. Other places
> in the code synchronize namesystem, then heartbeats. It's probably unlikely
> to occur in this test case, but it's a simple fix.
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