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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2051) JobTracker's TaskCommitQueue is vulnerable to non-IOExceptions
Date Sun, 14 Oct 2007 05:27:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12534583
] 

Devaraj Das commented on HADOOP-2051:
-------------------------------------

Exception in thread "Task Commit Thread" java.lang.NoClassDefFoundError: org/apache/hadoop/mapred/JobHistory$HistoryCleaner
        at org.apache.hadoop.mapred.JobHistory$JobInfo.logFinished(JobHistory.java:439)
        at org.apache.hadoop.mapred.JobInProgress.isJobComplete(JobInProgress.java:877)
        at org.apache.hadoop.mapred.JobInProgress.completedTask(JobInProgress.java:827)
        at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:400)
        at org.apache.hadoop.mapred.JobTracker$TaskCommitQueue.run(JobTracker.java:1977)

In Christian's jobtracker.out file, I found this exception. This would make the thread go
away.

> JobTracker's TaskCommitQueue is vulnerable to non-IOExceptions
> --------------------------------------------------------------
>
>                 Key: HADOOP-2051
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2051
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.15.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.15.0
>
>         Attachments: HADOOP-2051_1_20071013.patch
>
>
> The {{JobTracker#TaskCommitQueue#run}} method only handles {{IOException}}s. Christian
Kunz ran into a scenario where a job was stuck with all tasks in {{COMMIT_PENDING}} state
and the stack traces showed that the "Task Commit Thread" wasn't even around.
> The work-around is to model {{TaskCommitQueue#run}} along the lines of other long-running
threads in the {{JobTracer}} ({{ExpireLaunchingTasks}}, {{ExpireTrackers}} etc.) to catch,
log and ignore any {{Exception}} in a loop.

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