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From "Yan Zhou (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1648) Split combination may return too many block locations to map/reduce framework
Date Tue, 28 Sep 2010 17:22:34 GMT

     [ https://issues.apache.org/jira/browse/PIG-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yan Zhou updated PIG-1648:
--------------------------

    Attachment: PIG-1648.patch

> Split combination may return too many block locations to map/reduce framework
> -----------------------------------------------------------------------------
>
>                 Key: PIG-1648
>                 URL: https://issues.apache.org/jira/browse/PIG-1648
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.8.0
>            Reporter: Yan Zhou
>            Assignee: Yan Zhou
>             Fix For: 0.8.0
>
>         Attachments: PIG-1648.patch
>
>
> For instance, if a small split has block locations h1, h2 and h3; another small split
has h1, h3, h4. After combination, the composite split contains 4 block locations. If the
number of component splits is big, then the number of block locations could be big too. In
fact, the  number of block locations serves as a hint to M/R as the best hosts this composite
split should be run on so the list should contain a short list, say 5, of the hosts that contain
the most data in this composite split.

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