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https://issues.apache.org/jira/browse/HDFS-2616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160561#comment-13160561
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Suresh Srinivas commented on HDFS-2616:
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running tests on this patch.
> Change DatanodeProtocol#sendHeartbeat to return HeartbeatResponse
> -----------------------------------------------------------------
>
> 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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