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https://issues.apache.org/jira/browse/MAPREDUCE-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481862#comment-13481862
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Vinod Kumar Vavilapalli commented on MAPREDUCE-4730:
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Patch looks good.
Can you try writing a simple test for EventFetcher? You can mock
umbilicalProtocol, shuffleScheduler and reporter I suppose. Then you can
validate your current change also. Let me know if it becomes too cumbersome.
bq. The only issue I ran into was a significant number of maps and reduces
failed because they timed out trying to establish a connection to the AM.
This is new. I don't remember us running into it when we ran AMScalability. Can
you file a bug, more details will be great to have.
> AM crashes due to OOM while serving up map task completion events
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-4730
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4730
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: applicationmaster, mrv2
> Affects Versions: 0.23.3
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Blocker
> Attachments: MAPREDUCE-4730.patch, MAPREDUCE-4730.patch
>
>
> We're seeing a repeatable OOM crash in the AM for a task with around 30000
> maps and 3000 reducers. Details to follow.
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