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Posted to common-dev@hadoop.apache.org by "David Bowen (JIRA)" <ji...@apache.org> on 2007/03/22 17:13:32 UTC
[jira] Commented: (HADOOP-1140) Deadlock bug involving the
o.a.h.metrics package
[ https://issues.apache.org/jira/browse/HADOOP-1140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12483201 ]
David Bowen commented on HADOOP-1140:
-------------------------------------
I think this fix should go in 12.2, since it is a serious bug with a pretty small, safe fix. The bug showed up when using the Simon metrics implementation package, but I believe it could occur also with any other metrics implementation package, including the null one.
> Deadlock bug involving the o.a.h.metrics package
> ------------------------------------------------
>
> Key: HADOOP-1140
> URL: https://issues.apache.org/jira/browse/HADOOP-1140
> Project: Hadoop
> Issue Type: Bug
> Reporter: David Bowen
> Assigned To: David Bowen
> Attachments: 1140.patch
>
>
> Hi David,
> Our nightly benchmarks are occasionally failing (2 to 4 of them per night) due to this deadlock in the JT that looks to be caused by Simon. Do you have time to fix this in the morning?
> Thanks,
> Nige
> Found one Java-level deadlock:
> =============================
> "expireLaunchingTasks":
> waiting to lock monitor 0x08141b44 (object 0x57eafdd0, a org.apache.hadoop.mapred.JobTracker),
> which is held by "IPC Server handler 8 on 50020"
> "IPC Server handler 8 on 50020":
> waiting to lock monitor 0x08141630 (object 0x57de46b8, a com.yahoo.simon.hadoop.metrics.SimonContext),
> which is held by "Timer-0"
> "Timer-0":
> waiting to lock monitor 0x08141b44 (object 0x57eafdd0, a org.apache.hadoop.mapred.JobTracker),
> which is held by "IPC Server handler 8 on 50020"
> Java stack information for the threads listed above:
> ===================================================
> "expireLaunchingTasks":
> at org.apache.hadoop.mapred.JobTracker$ExpireLaunchingTasks.run(JobTracker.java:152)
> - waiting to lock <0x57eafdd0> (a org.apache.hadoop.mapred.JobTracker)
> at java.lang.Thread.run(Thread.java:619)
> "IPC Server handler 8 on 50020":
> at org.apache.hadoop.metrics.spi.AbstractMetricsContext.createRecord(AbstractMetricsContext.java:192)
> - waiting to lock <0x57de46b8> (a com.yahoo.simon.hadoop.metrics.SimonContext)
> at org.apache.hadoop.mapred.JobInProgress.<init>(JobInProgress.java:130)
> at org.apache.hadoop.mapred.JobTracker.submitJob(JobTracker.java:1383)
> - locked <0x57eafdd0> (a org.apache.hadoop.mapred.JobTracker)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:336)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:559)
> "Timer-0":
> at org.apache.hadoop.mapred.JobTracker.getRunningJobs(JobTracker.java:943)
> - waiting to lock <0x57eafdd0> (a org.apache.hadoop.mapred.JobTracker)
> at org.apache.hadoop.mapred.JobTracker$JobTrackerMetrics.doUpdates(JobTracker.java:429)
> at org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:275)
> - locked <0x57de46b8> (a com.yahoo.simon.hadoop.metrics.SimonContext)
> at org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:48)
> at org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:242)
> at java.util.TimerThread.mainLoop(Timer.java:512)
> at java.util.TimerThread.run(Timer.java:462)
> Found 1 deadlock.
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