Lisheng Sun created HDFS-15255:
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Summary: Consider StorageType in DatanodeManager#sortLocatedBlock()
Key: HDFS-15255
URL: https://issues.apache.org/jira/browse/HDFS-15255
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Lisheng Sun
When only one replica of a block is SDD, the others are HDD.
When the client reads the data, the current logic is that it considers the
distance between the client and the dn. I think it should also consider the
StorageType of the replica. Priority to return a replica of the specified
StorageType
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