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From "Ayush Saxena (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14591) NameNode should move the replicas to the correct storages after the storage policy is changed.
Date Fri, 21 Jun 2019 03:31:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16869129#comment-16869129
] 

Ayush Saxena commented on HDFS-14591:
-------------------------------------

can SPS help? Give a check to HDFS-10285

> 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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