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https://issues.apache.org/jira/browse/MAPREDUCE-210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065216#comment-14065216
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Allen Wittenauer commented on MAPREDUCE-210:
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Ping!
> 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
> Assignee: indrajit
> 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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