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https://issues.apache.org/jira/browse/HADOOP-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591951#action_12591951
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Andrzej Bialecki  commented on HADOOP-2019:
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The Tar version available from commons sandbox has a subtle bug when creating 
tar files (it appends only one null block at the end of archive, instead of two 
empty blocks as expected by GNU tar). Ant <tar> task contains a fixed copy of 
the same class.

> DistributedFileCache should support .tgz files in addition to jars and zip 
> files
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-2019
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2019
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.14.3
>            Reporter: Owen O'Malley
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.18.0
>
>
> Currently the distributed file cache only works with zip and jar archives, 
> which don't work for larger than 2g. We should support .tgz archives also.

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