Jinglun created HDFS-15120:
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Summary: Refresh BlockPlacementPolicy at runtime.
Key: HDFS-15120
URL: https://issues.apache.org/jira/browse/HDFS-15120
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Jinglun
Assignee: Jinglun
Now if we want to switch BlockPlacementPolicies we need to restart the
NameNode. It would be convenient if we can switch it at runtime. For example we
can switch between AvailableSpaceBlockPlacementPolicy and
BlockPlacementPolicyDefault as needed.
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