Diregard Hadoop QA last comment. The patch couldn't be applied
because the patch has already been committed.
On Feb 2, 2007, at 12:37 PM, Hadoop QA (JIRA) wrote:
[ https://issues.apache.org/jira/browse/HADOOP-969?
page=com.atlassian.jira.plugin.system.issuetabpanels:comment-
tabpanel#action_12469861 ]
Hadoop QA commented on HADOOP-969:
----------------------------------
-1, because the patch command could not apply the latest attachment
(http://issues.apache.org/jira/secure/attachment/12350238/jt-
dead.patch) as a patch to trunk revision r502726. Please note that
this message is automatically generated and may represent a problem
with the automation system and not the patch.
deadlock in job tracker RetireJobs
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Key: HADOOP-969
URL: https://issues.apache.org/jira/browse/HADOOP-969
Project: Hadoop
Issue Type: Bug
Components: mapred
Reporter: Owen O'Malley
Assigned To: Owen O'Malley
Priority: Critical
Fix For: 0.11.0
Attachments: jt-dead.patch
The JobTracker deadlocks because RetireJobs grabs locks in the
wrong order. The call stacks look like:
"IPC Server handler 5 on 50020":
at
org.apache.hadoop.mapred.JobTracker.getNewTaskForTaskTracker
(JobTracker.java:1108)
- waiting to lock <0x74487a80> (a java.util.Vector)
- locked <0x744874b0> (a org.apache.hadoop.mapred.JobTracker)
at org.apache.hadoop.mapred.JobTracker.heartbeat
(JobTracker.java:992)
- locked <0x744874b0> (a org.apache.hadoop.mapred.JobTracker)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:337)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:538)
"retireJobs":
at org.apache.hadoop.mapred.JobTracker.removeJobTasks
(JobTracker.java:782)
- waiting to lock <0x744874b0> (a
org.apache.hadoop.mapred.JobTracker)
at org.apache.hadoop.mapred.JobTracker.access$300
(JobTracker.java:42)
at org.apache.hadoop.mapred.JobTracker$RetireJobs.run
(JobTracker.java:312)
- locked <0x74487bb0> (a java.util.ArrayList)
- locked <0x74487a80> (a java.util.Vector)
- locked <0x74487a58> (a java.util.TreeMap)
at java.lang.Thread.run(Thread.java:595)
Found 1 deadlock.
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