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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-830) Providing BZip2 splitting support for Text data
Date Wed, 02 Sep 2009 00:07:33 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated MAPREDUCE-830:
------------------------------------

    Attachment: M830-2.patch

Corresponding changes in 4012-12 reflected here, including merge with MAPREDUCE-773

> Providing BZip2 splitting support for Text data
> -----------------------------------------------
>
>                 Key: MAPREDUCE-830
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-830
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.21.0
>            Reporter: Abdul Qadeer
>            Assignee: Abdul Qadeer
>             Fix For: 0.21.0
>
>         Attachments: M830-2.patch, MapReduce-830-version1.patch
>
>
> HADOOP-4012 (https://issues.apache.org/jira/browse/HADOOP-4012) is providing support
to handle BZip2 compressed data such that the input compressed file is split at arbitrary
points.  This JIRA uses that functionality in LineRecordReader.  The benefit of this work
is that, if user provides compressed BZip2 Text data, it will be split by Hadoop and hence
will be processed by multiple mappers.  So BZip2 compressed data will be able to fully utilize
the cluster power.  Currently BZip2 compressed Text file goes to one mapper and is not split.
 So the enhancement in this JIRA provides splitting support  and a considerable performance
gains.

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