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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1824) want InputFormat for zip files
Date Mon, 04 Feb 2008 18:07:09 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12565444#action_12565444
] 

Doug Cutting commented on HADOOP-1824:
--------------------------------------

Sorry, I wasn't clear.  I was thinking we might try using, instead of minizip, the source
code for the unzip command line executable, http://www.info-zip.org/UnZip.html, which uses
file-io directly, but not in too many places.

> want InputFormat for zip files
> ------------------------------
>
>                 Key: HADOOP-1824
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1824
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.15.2
>            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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