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

["David Ongaro (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-8065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15108043#comment-15108043 ] 

David Ongaro commented on HADOOP-8065:
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When will this finally get merged? I was delighted to see that the Amazon s3distcp supports output compression (http://docs.aws.amazon.com/ElasticMapReduce/latest/ReleaseGuide/UsingEMR_s3distcp.html) but got disappointed to see that it's not supported by the standard distcp included in hadoop even though it can output to s3.

I think copying the data to a different storage system is a perfectly valid (probably even common?) usecase, to have the data compressed, even though it doesn't need to be compressed on hdfs. It's just an unnecessary step and a waste of resources if we have to duplicate the data on hdfs in compressed form before the distcp.

> distcp 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
>
>         Attachments: HADOOP-8065-trunk_2015-11-03.patch, HADOOP-8065-trunk_2015-11-04.patch, patch.distcp.2012-02-10
>
>
> 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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