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https://issues.apache.org/jira/browse/HADOOP-4904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657959#action_12657959
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Konstantin Shvachko commented on HADOOP-4904:
---------------------------------------------
I ran tests. Only one failed: TestMapReduceLocal. This is related to
HADOOP-4907.
> Deadlock while leaving safe mode.
> ---------------------------------
>
> Key: HADOOP-4904
> URL: https://issues.apache.org/jira/browse/HADOOP-4904
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.18.3
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Blocker
> Fix For: 0.18.3
>
> Attachments: safeModeDeadlock-0-18.patch,
> safeModeDeadlock-0-18.patch, safeModeDeadlock.patch
>
>
> {{SafeModeInfo.leave()}} acquires locks in an incorrect order, which causes
> the deadlock.
> It first acquires the {{SafeModeInfo}} lock, then calls
> {{FSNamesystem.processMisReplicatedBlocks()}}, which requires the global
> {{FSNamesystem}} lock.
> It should be the other way around: first {{FSNamesystem}} lock, then
> {{SafeModeInfo}}.
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