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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1348) PigStorage making unnecessary byte array copy when storing data
Date Wed, 07 Apr 2010 17:26:34 GMT

     [ https://issues.apache.org/jira/browse/PIG-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard Ding updated PIG-1348:
------------------------------

    Status: Open  (was: Patch Available)

> PigStorage making unnecessary byte array copy when storing data
> ---------------------------------------------------------------
>
>                 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
>             Fix For: 0.7.0
>
>         Attachments: PIG-1348.patch, PIG-1348_2.patch
>
>
> 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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