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Posted to mapreduce-issues@hadoop.apache.org by "gopikannan venugopalsamy (JIRA)" <ji...@apache.org> on 2011/02/02 00:42:32 UTC

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

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989456#comment-12989456 ] 

gopikannan venugopalsamy commented on MAPREDUCE-2257:
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Hello,
    I wish to contribute to this issue but I am new to this project.Can you guys give some tips for where to start from

> 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)

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