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Date: Mon, 21 Nov 2011 09:52:52 +0000 (UTC)
From: "Harsh J (Commented) (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-7842) a compress tool for test
 compress/decompress locally use hadoop compress codecs
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    [ https://issues.apache.org/jira/browse/HADOOP-7842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13154091#comment-13154091 ] 

Harsh J commented on HADOOP-7842:
---------------------------------

Hello Kang,

Could you explain the rationale behind this? Files are already decompressed by {{-cat}}, etc. shell utils, native programs like lzo's.

If its for testing native lib loads, or compression codec loading, we already have TestCodec for that, which I've once explained how to use at: http://search-hadoop.com/m/RqwE52Sh1GI

Given these two facts, I believe the only usefulness of adding this is to compress a file given a codec? Perhaps TestCodec may be extended to provide such a utility as well?
                
> a compress tool for test compress/decompress locally use hadoop compress codecs
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-7842
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7842
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: io
>            Reporter: Kang Xiao
>            Assignee: Kang Xiao
>              Labels: compression
>         Attachments: HADOOP-7842.patch
>
>
> add a compress tool for test compress/decompress locally use hadoop compress codecs.
> It can be used as follows:
> compress a.txt to a.lzo:
> hadoop jar test.jar org.apache.hadoop.io.compress.CodecTool org.apache.hadoop.io.compress.LzoCodec -c 1024 1024 a.txt a.lzo
> decompress a.lzo to stdout:
> hadoop jar test.jar org.apache.hadoop.io.compress.CodecTool org.apache.hadoop.io.compress.LzoCodec -x 1024 1024 a.lzo /dev/stdout

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