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From "lohit vijayarenu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1823) want InputFormat for bzip2 files
Date Mon, 17 Mar 2008 18:26:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12579545#action_12579545
] 

lohit vijayarenu commented on HADOOP-1823:
------------------------------------------

I was able to use this bzip2.jar with streaming. This would be a very useful addition. 

> want InputFormat for bzip2 files
> --------------------------------
>
>                 Key: HADOOP-1823
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1823
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: Doug Cutting
>         Attachments: bzip2.jar
>
>
> Unlike gzip, the bzip file format supports splitting.  Compression is by blocks (900k
by default) and blocks are separated by a synchronization marker (a 48-bit approximation of
Pi).  This would permit very large compressed files to be split into multiple map tasks, which
is not currently possible unless using a Hadoop-specific file format.

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