deadlock issue in taskstracker.
-------------------------------
Key: HADOOP-791
URL: http://issues.apache.org/jira/browse/HADOOP-791
Project: Hadoop
Issue Type: Bug
Components: mapred
Reporter: Mahadev konar
Assigned To: Mahadev konar
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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