[jira] [Assigned] (MAPREDUCE-2257) distcp can copy blocks in parallel

["dhruba borthakur (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur reassigned MAPREDUCE-2257:
-------------------------------------------

    Assignee:     (was: dhruba borthakur)

This patch really speeded up distcp. However I am unable to work on this at present. If somebody can take over, that will be great, otherwise I will get back to this one sometime soon.
                
> 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
>         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)

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