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Posted to common-dev@hadoop.apache.org by "Johan Oskarson (JIRA)" <ji...@apache.org> on 2006/09/08 15:17:22 UTC

[jira] Created: (HADOOP-515) Rsync like way of retrieving data from the dfs

Rsync like way of retrieving data from the dfs
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                 Key: HADOOP-515
                 URL: http://issues.apache.org/jira/browse/HADOOP-515
             Project: Hadoop
          Issue Type: New Feature
          Components: dfs
    Affects Versions: 0.5.0
            Reporter: Johan Oskarson


As the dfs in our cluster contains a lot of important data, being able to retrieve them to a non dfs backup node is essential.
However, a lot of the files don't change inbetween backups, so a way to get only the files that have changed would be preferable.

Since the blocks themselves already have a crc calculated half the job is already done, if it's possible to split the destination files in similar blocks and calculate the crc for them.

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