Change DatanodeProtocol#sendHeartbeat to return HeartbeatResponse
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Key: HDFS-2616
URL: https://issues.apache.org/jira/browse/HDFS-2616
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Fix For: HA branch (HDFS-1623)
Attachments: HDFS-2616.txt
DatanodeProtocol#sendHeartbeat() returns DatanodeCommand[]. This jira proposes
changing it to to return HeartbeatResponse that has DatanodeCommand[]. This
allows adding other information that can be returned by the namenode to the
datanode, instead of having to only return DatanodeCommand[]. For relevant
discussion see HDFS-1972.
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