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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