[ http://issues.apache.org/jira/browse/HADOOP-791?page=all ]
Owen O'Malley updated HADOOP-791:
---------------------------------
Fix Version/s: 0.9.2
Affects Version/s: 0.9.1
> deadlock issue in taskstracker.
> -------------------------------
>
> Key: HADOOP-791
> URL: http://issues.apache.org/jira/browse/HADOOP-791
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.9.1
> Reporter: Mahadev konar
> Assigned To: Mahadev konar
> Fix For: 0.9.2
>
> Attachments: deadlock2.patch
>
>
> the stack trace--
> "main":
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.createStatus(TaskTracker.java:880)
> - waiting to lock <0xea101658> (a
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress)
> at
> org.apache.hadoop.mapred.TaskTracker.transmitHeartBeat(TaskTracker.java:489)
> - locked <0x75505f00> (a org.apache.hadoop.mapred.TaskTracker)
> at
> org.apache.hadoop.mapred.TaskTracker.offerService(TaskTracker.java:442)
> at org.apache.hadoop.mapred.TaskTracker.run(TaskTracker.java:720)
> at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:1374)
> "taskCleanup":
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.cleanup(TaskTracker.java:1072)
> - waiting to lock <0x75505f00> (a
> org.apache.hadoop.mapred.TaskTracker)
> at
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress.jobHasFinished(TaskTracker.java:1013)
> - locked <0xea101658> (a
> org.apache.hadoop.mapred.TaskTracker$TaskInProgress)
> at org.apache.hadoop.mapred.TaskTracker$1.run(TaskTracker.java:144)
> at java.lang.Thread.run(Thread.java:595)
> Found 1 deadlock.
> The jobhasfinished method and transmitHeart beat lock the tasktracker and tip
> in a different order. Also , before emitting HeartBeat we should be updating
> the status and removing entries from runningtasks. Currently this is done
> after the heartbeat.
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