Mailing-List: contact mapreduce-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: mapreduce-issues@hadoop.apache.org
Date: Fri, 18 Mar 2011 23:05:29 +0000 (UTC)
From: "Rosie Li (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Message-ID: 
 <457287109.13101.1300489529965.JavaMail.tomcat@hel.zones.apache.org>
In-Reply-To: <26895646.290321294770708037.JavaMail.jira@thor>
Subject: [jira] Commented: (MAPREDUCE-2257) distcp can copy blocks in
 parallel
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/MAPREDUCE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008669#comment-13008669 ] 

Rosie Li commented on MAPREDUCE-2257:
-------------------------------------

I'm working on this feature right now. Already done writing the code. Testing now.

> distcp can copy blocks in parallel
> ----------------------------------
>
>                 Key: MAPREDUCE-2257
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2257
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: distcp
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> The minimum unit of work for a distcp task is a file. We have files that are greater than 1 TB with a block size of  1 GB. If we use distcp to copy these files, the tasks either take a long long long time or finally fails. A better way for distcp would be to copy all the source blocks in parallel, and then stich the blocks back to files at the destination via the HDFS Concat API (HDFS-222)

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira