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Posted to dev@pig.apache.org by "Cheolsoo Park (JIRA)" <ji...@apache.org> on 2014/06/28 04:24:24 UTC

[jira] [Created] (PIG-4043) JobClient.getMap/ReduceTaskReports() causes OOM for jobs with a large number of tasks

Cheolsoo Park created PIG-4043:
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             Summary: JobClient.getMap/ReduceTaskReports() causes OOM for jobs with a large number of tasks
                 Key: PIG-4043
                 URL: https://issues.apache.org/jira/browse/PIG-4043
             Project: Pig
          Issue Type: Bug
            Reporter: Cheolsoo Park
            Assignee: Cheolsoo Park
             Fix For: 0.14.0


With Hadoop 2.4, I often see Pig client fails due to OOM when there are many tasks (~100K) with 1GB heap size.

The heap dump (attached) shows that TaskReport[] occupies more than 90% of heap space at the time of OOM.

The problem is that JobClient.getMap/ReduceTaskReports() returns an array of TaskReport objects, which can be huge if the number of task is large.



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