hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "liuwei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2257) distcp can copy blocks in parallel
Date Wed, 02 Jul 2014 14:56:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049997#comment-14049997
] 

liuwei commented on MAPREDUCE-2257:
-----------------------------------

since distcp has distcp2, is there a patch exits for distcp2 to copy blocks in parallel?

> 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
>    Affects Versions: 0.21.0
>            Reporter: dhruba borthakur
>            Assignee: Mithun Radhakrishnan
>         Attachments: MAPREDUCE-2257.patch
>
>
> 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 was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message