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From "Patrick Angeles (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-210) want InputFormat for zip files
Date Fri, 25 Sep 2009 16:40:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759618#action_12759618
] 

Patrick Angeles commented on MAPREDUCE-210:
-------------------------------------------

Any updates on this issue? What's the current thinking on shell tools + JNI versus Ant's unzip
code? Anything I can do to contribute? Regards...

> want InputFormat for zip files
> ------------------------------
>
>                 Key: MAPREDUCE-210
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-210
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Doug Cutting
>         Attachments: ZipInputFormat_fixed.patch
>
>
> HDFS is inefficient with large numbers of small files.  Thus one might pack many small
files into large, compressed, archives.  But, for efficient map-reduce operation, it is desireable
to be able to split inputs into smaller chunks, with one or more small original file per split.
 The zip format, unlike tar, permits enumeration of files in the archive without scanning
the entire archive.  Thus a zip InputFormat could efficiently permit splitting large archives
into splits that contain one or more archived files.

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