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https://issues.apache.org/jira/browse/HADOOP-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569322#action_12569322
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Runping Qi commented on HADOOP-2837:
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It's not my job, and since the web gui does not response, I don't know the
exact number of mappers.
But through log, I know it has at least 60000 mappers.
The heapsize is 1000M (the default, I believe).
> JobTracker got stuck
> ---------------------
>
> Key: HADOOP-2837
> URL: https://issues.apache.org/jira/browse/HADOOP-2837
> Project: Hadoop Core
> Issue Type: Bug
> Reporter: Runping Qi
>
> When a job tracker ran a job with a lot of map tasks,
> the commit thread complained out of memory:
> 2008-02-14 02:52:13,809 ERROR org.apache.hadoop.mapred.JobTracker: Task
> Commit Thread got an exception: java.lang.OutOfMemoryError: Java heap space
> 2008-02-14 02:53:18,543 ERROR org.apache.hadoop.mapred.JobTracker: Task
> Commit Thread got an exception: java.lang.OutOfMemoryError: Java heap space
> 2008-02-14 02:53:26,965 ERROR org.apache.hadoop.mapred.JobTracker: Task
> Commit Thread got an exception: java.lang.OutOfMemoryError: Java heap space
> 2008-02-14 02:54:27,009 ERROR org.apache.hadoop.mapred.JobTracker: Task
> Commit Thread got an exception: java.lang.OutOfMemoryError: Java heap space
> then later, the job tracker stopped making any progress, and stopped
> responding web GUI.
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