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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-830) Providing BZip2 splitting support for Text data
Date Tue, 08 Sep 2009 02:12:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752304#action_12752304
] 

Chris Douglas commented on MAPREDUCE-830:
-----------------------------------------

(also includes a workaround for MAPREDUCE-959, which was getting irritating, and updates the
unit tests to JUnit4 semantics)

> 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, M830-3.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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