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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-796) 4-thread Deadlock in DFS Client
Date Mon, 30 Nov 2009 23:02:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783923#action_12783923

Todd Lipcon commented on HDFS-796:

just realized I was actually running an earlier checkout that didn't have HDFS-723 included.
These stacks aren't exactly the same, so I'll leave it open, but feel free to resolve as dup
if it's the same root cause.

> 4-thread Deadlock in DFS Client
> -------------------------------
>                 Key: HDFS-796
>                 URL: https://issues.apache.org/jira/browse/HDFS-796
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>            Reporter: Todd Lipcon
>         Attachments: deadlock.txt
> Managed to get this deadlock running TestHDFSCLI this afternoon. It seems to be related
to a signal, though I don't recall hitting ^C. The one thing I did that might help trigger
this was reduce the Thread.sleep(1000) in LeaseChecker down to a shorter interval.
> "SIGTERM handler":
>   waiting to lock monitor 0x0000000041f3bd18 (object 0x00007fa43c132328, a java.lang.Class),
>   which is held by "SIGINT handler"
> "SIGINT handler":
>   waiting to lock monitor 0x000000004230b410 (object 0x00007fa441603030, a org.apache.hadoop.fs.FileSystem$Cache$ClientFinalizer),
>   which is held by "Thread-3"
> "Thread-3":
>   waiting to lock monitor 0x00007fa4341fe3f0 (object 0x00007fa441d3b150, a org.apache.hadoop.hdfs.DFSClient$DFSOutputStream),
>   which is held by "main"
> "main":
>   waiting to lock monitor 0x0000000042b1ec80 (object 0x00007fa44167eff8, a org.apache.hadoop.hdfs.DFSClient$LeaseChecker),
>   which is held by "Thread-3"

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