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Posted to common-dev@hadoop.apache.org by "lohit vijayarenu (JIRA)" <ji...@apache.org> on 2008/03/17 19:26:24 UTC

[jira] Commented: (HADOOP-1823) want InputFormat for bzip2 files

    [ 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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