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From "Haitao Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2812) Spill InternalCachedBag into only 1 file
Date Sat, 21 Jul 2012 08:43:34 GMT

    [ https://issues.apache.org/jira/browse/PIG-2812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419768#comment-13419768
] 

Haitao Yao commented on PIG-2812:
---------------------------------

well, the spilled files should have been cleared under the normal condition. But if your job
failed, and the Tasktracker reuses the child java process, the OOM would happen.
I really think spill to one file is better.

                
> Spill InternalCachedBag into only 1 file
> ----------------------------------------
>
>                 Key: PIG-2812
>                 URL: https://issues.apache.org/jira/browse/PIG-2812
>             Project: Pig
>          Issue Type: Bug
>          Components: data
>            Reporter: Haitao Yao
>             Fix For: 0.11
>
>         Attachments: aa.jpg
>
>
> I encountered a reducer's OOM because of java.io.DeleteOnExitHook. And I found out that
the InternalCachedBag creates a seperate tmp file, and the tmp files is deleted on exit. So
the file delete hook caused the OOM. 
> Why not just hold the tmp file handle and spill only one tmp file?
> Too many tmp files may block the tasktracker start process, if the tmp files are not
cleaned on time and the tasktracker restarts at this specific time.

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