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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1348) InternalCachedBag running out of memory
Date Thu, 01 Apr 2010 19:13:27 GMT

    [ https://issues.apache.org/jira/browse/PIG-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852511#action_12852511
] 

Ashutosh Chauhan commented on PIG-1348:
---------------------------------------

To reproduce, cogroup page_views(from PigMix's dataset) with page_views on user and this exception
should occur. Apart from making InternalCachedBag more robust, important thing to figure out
here is to see where 90% of available memory is getting used. Also, a related fix went in
for this recently: PIG-1307 Might be related to that issue. 

> InternalCachedBag running out of memory
> ---------------------------------------
>
>                 Key: PIG-1348
>                 URL: https://issues.apache.org/jira/browse/PIG-1348
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Richard Ding
>
> InternalCachedBag makes estimate of memory available to the VM by using Runtime.getRuntime().maxMemory().
It then uses 10%(by default, though configurable) of this memory and divides this memory into
number of bags. It keeps track of the memory used by bags and then proactively spills if bags
memory usage reach close to these limits. Given all this in theory when presented with data
more then it can handle InternalCachedBag should not run out of memory. But in practice we
find OOM happening. 

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