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Posted to hdfs-dev@hadoop.apache.org by "Jinglun (JIRA)" <ji...@apache.org> on 2019/06/21 03:22:00 UTC

[jira] [Created] (HDFS-14591) NameNode should move the replicas to the correct storages after the storage policy is changed.

Jinglun created HDFS-14591:
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             Summary: 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


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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