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https://issues.apache.org/jira/browse/HDFS-14591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ayush Saxena reopened HDFS-14591:
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Reopened and closing again as duplicate rather than fixed.

> NameNode should move the replicas to the correct storages after the storage 
> policy is changed.
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-14591
>                 URL: https://issues.apache.org/jira/browse/HDFS-14591
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Jinglun
>            Assignee: Jinglun
>            Priority: Major
>
> Our Xiaomi HDFS has a cluster storaging both HOT and COLD data. We have a 
> backgroud process searching all the files to find those that are not accessed 
> for a period of time. Then we set them to COLD and start a mover to move the 
> replicas. After moving, all the replicas are consistent with the storage 
> policy.
> It's a natural idea to let the NameNode handle the move.



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