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Posted to common-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2008/03/31 22:12:31 UTC
[jira] Commented: (HADOOP-3139) DistributedFileSystem.close()
introduces a deadlock
[ https://issues.apache.org/jira/browse/HADOOP-3139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583818#action_12583818 ]
Tsz Wo (Nicholas), SZE commented on HADOOP-3139:
------------------------------------------------
The "synchronized" in DistributedFileSystem.close() is not necessary and shell be removed.
> DistributedFileSystem.close() introduces a deadlock
> ---------------------------------------------------
>
> Key: HADOOP-3139
> URL: https://issues.apache.org/jira/browse/HADOOP-3139
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
>
> Koji found the following:
> My dfs -ls hang.
> Ctrl-Z showed a deadlock state.
> {noformat}
> "Thread-0":
> at org.apache.hadoop.dfs.DistributedFileSystem.close(DistributedFileSystem.java:190)
> - waiting to lock <0xedde8788> (a org.apache.hadoop.dfs.DistributedFileSystem)
> at org.apache.hadoop.fs.FileSystem$Cache.closeAll(FileSystem.java:1231)
> - locked <0xee0baf88> (a org.apache.hadoop.fs.FileSystem$Cache)
> at org.apache.hadoop.fs.FileSystem.closeAll(FileSystem.java:169)
> at org.apache.hadoop.fs.FileSystem$ClientFinalizer.run(FileSystem.java:154)
> - locked <0xee0bae40> (a org.apache.hadoop.fs.FileSystem$ClientFinalizer)
> "main":
> at org.apache.hadoop.fs.FileSystem$Cache.remove(FileSystem.java:1201)
> - waiting to lock <0xee0baf88> (a org.apache.hadoop.fs.FileSystem$Cache)
> at org.apache.hadoop.fs.FileSystem.close(FileSystem.java:1085)
> at org.apache.hadoop.dfs.DistributedFileSystem.close(DistributedFileSystem.java:192)
> - locked <0xedde8788> (a org.apache.hadoop.dfs.DistributedFileSystem)
> at org.apache.hadoop.fs.FsShell.close(FsShell.java:1698)
> at org.apache.hadoop.fs.FsShell.main(FsShell.java:1712)
> Found 1 deadlock.
> {noformat}
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