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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