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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5899) Support incremental data copy in DistCp
Date Wed, 21 May 2014 18:49:39 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated MAPREDUCE-5899:
---------------------------------

    Attachment: MAPREDUCE-5899.002.patch

Thanks again, Nicholas! Update the patch to fix javac/findbug warnings and unit tests.

> Support incremental data copy in DistCp
> ---------------------------------------
>
>                 Key: MAPREDUCE-5899
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5899
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: distcp
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HADOOP-10608.000.patch, HADOOP-10608.001.patch, MAPREDUCE-5899.002.patch
>
>
> Currently when doing distcp with -update option, for two files with the same file names
but with different file length or checksum, we overwrite the whole file. It will be good if
we can detect the case where (sourceFile = targetFile + appended_data), and only transfer
the appended data segment to the target. This will be very useful if we're doing incremental
distcp.



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