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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