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From "Suraj Nayak M (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8065) distcp should have an option to compress data while copying.
Date Fri, 29 Apr 2016 08:33:13 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8065?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suraj Nayak M updated HADOOP-8065:
----------------------------------
    Attachment: HADOOP-8065-trunk_2016-04-29.patch

Added patch for enabling compression when using
{{-D mapreduce.output.fileoutputformat.compress=true -D mapreduce.output.fileoutputformat.compress.codec=org.apache.hadoop.io.compress.BZip2Codec}}
with distcp.

Added TestCase for 3 popular compression algorithms which hadoop ships out of the box.
# BZip2Codec
# GzipCodec
# DeflateCodec

Let me know the inputs/suggestions to make this patch better.

> 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
>            Assignee: Suraj Nayak M
>            Priority: Minor
>              Labels: distcp
>             Fix For: 0.20.2
>
>         Attachments: HADOOP-8065-trunk_2015-11-03.patch, HADOOP-8065-trunk_2015-11-04.patch,
HADOOP-8065-trunk_2016-04-29.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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