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https://issues.apache.org/jira/browse/HADOOP-969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley updated HADOOP-969:
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Attachment: jt-dead.patch
This code has gotten pretty hairy, but this patch goes through the list of jobs
to find ones that need to be retired. It then locks everything including the
JobTracker first and does the mutations to all of the maps. We really need to
refactor the datastructures at some point soon...
> deadlock in job tracker RetireJobs
> ----------------------------------
>
> 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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