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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-796) 4-thread Deadlock in DFS Client
Date Mon, 30 Nov 2009 22:53:20 GMT
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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