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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3139) DistributedFileSystem.close() introduces a deadlock
Date Mon, 31 Mar 2008 20:10:25 GMT
DistributedFileSystem.close() introduces a deadlock
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                 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.

"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.

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