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From "Grant Mackey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1824) want InputFormat for zip files
Date Fri, 31 Oct 2008 00:00:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644171#action_12644171
] 

Grant Mackey commented on HADOOP-1824:
--------------------------------------

I have use for this canceled patch as of present. Are there bits of the code that need to
modified in order for it to run properly on hadoop 0.17, or should I be able to pop them into
the mapred directory and go?

> 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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