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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10608) Support incremental data copy in DistCp
Date Wed, 14 May 2014 22:14:16 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HADOOP-10608:
-------------------------------

    Summary: Support incremental data copy in DistCp  (was: Support appending data in DistCp)

> Support incremental data copy in DistCp
> ---------------------------------------
>
>                 Key: HADOOP-10608
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10608
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HADOOP-10608.000.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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