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https://issues.apache.org/jira/browse/HADOOP-9700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706371#comment-13706371
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Luke Lu commented on HADOOP-9700:
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bq. The smallest unit of distcp is file
MAPREDUCE-2257 aims to change the copy unit to block.
> Snapshot support for distcp
> ---------------------------
>
> Key: HADOOP-9700
> URL: https://issues.apache.org/jira/browse/HADOOP-9700
> Project: Hadoop Common
> Issue Type: New Feature
> Components: tools/distcp
> Reporter: Binglin Chang
> Assignee: Binglin Chang
> Attachments: HADOOP-9700-demo.patch
>
>
> Add snapshot incremental copy ability to distcp, so we can do iterative
> consistent backup between hadoop clusters.
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