[jira] [Commented] (HADOOP-8065) discp should have an option to compress data while copying.

["Koji Noguchi (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-8065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207366#comment-13207366 ] 

Koji Noguchi commented on HADOOP-8065:
--------------------------------------

I'm not convinced compression belongs to distcp.  
I would rather see option to compress on 'har' (hadoop archive).
                
> discp should have an option to compress data while copying.
> -----------------------------------------------------------
>
>                 Key: HADOOP-8065
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8065
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.20.2
>            Reporter: Suresh Antony
>            Priority: Minor
>              Labels: distcp
>             Fix For: 0.20.2
>
>
> We would like compress the data while transferring from our source system to target system. One way to do this is to write a map/reduce job to compress that after/before being transferred. This looks inefficient. 
> Since distcp already reading writing data it would be better if it can accomplish while doing this. 
> Flip side of this is that distcp -update option can not check file size before copying data. It can only check for the existence of file. 
> So I propose if -compress option is given then file size is not checked.
> Also when we copy file appropriate extension needs to be added to file depending on compression type.

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