[ http://issues.apache.org/jira/browse/HADOOP-791?page=comments#action_12458366 ] Hadoop QA commented on HADOOP-791: ----------------------------------
+1, since http://issues.apache.org/jira/secure/attachment/12347138/deadlock.patch applied and successfully tested against trunk revision r486901. > 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 > Attachments: deadlock.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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
