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https://issues.apache.org/jira/browse/HDFS-14591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16869174#comment-16869174
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Wei-Chiu Chuang commented on HDFS-14591:
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I think what Jinglun wants is a more advanced version, one that detects the
temperature of data and move files around according to the temperature. That
is, something similar to what's proposed in HDFS-7343.
Frankly speaking, SPS looks interesting, but it is not built for my customers'
use cases. I've been wanting to have SSM but it's not on the top of my list to
implement...
> 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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