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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-96) It should be possible to spill big databags to HDFS
Date Mon, 26 Jan 2009 20:03:59 GMT

     [ https://issues.apache.org/jira/browse/PIG-96?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Olga Natkovich resolved PIG-96.
-------------------------------

    Resolution: Fixed

Based on the discussion I don't see a reason to spill to DFS

> It should be possible to spill big databags to HDFS
> ---------------------------------------------------
>
>                 Key: PIG-96
>                 URL: https://issues.apache.org/jira/browse/PIG-96
>             Project: Pig
>          Issue Type: Improvement
>          Components: data
>            Reporter: Pi Song
>
> Currently databags only get spilled to local disk which costs  2  disk io operations.If
databags are too big, this is not efficient. 
> We should take advantage of HDFS so if the databag is too big (determined by DataBag.getMemorySize()
>  a big  threshold), let's spill it to HDFS. Also read from HDFS in parallel when data
is required.

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