[jira] Updated: (HADOOP-5675) DistCp should not launch a job if it is not necessary

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-5675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HADOOP-5675:
-------------------------------------------

     Description: Currently, DistCp launch a job even if it is not necessary.  In such case, the job does nothing.  (was: Currently, DistCp launch a job even if byteCount == 0.  In such case, the job does nothing.)
    Hadoop Flags:   (was: [Reviewed])
         Summary: DistCp should not launch a job if it is not necessary  (was: DistCp should not launch a job if byteCount == 0)

If there are only zero length files, we have byteCount == 0.  However, DistCp should launch a job to copy these zero length files in this case.  Instead of byteCount, we should use fileCount, which counts how many files needed to be copied.

Edited summary and description to reflect this.

> DistCp should not launch a job if it is not necessary
> -----------------------------------------------------
>
>                 Key: HADOOP-5675
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5675
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: tools/distcp
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Minor
>         Attachments: 5675_20090414.patch
>
>
> Currently, DistCp launch a job even if it is not necessary.  In such case, the job does nothing.

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