HA: determine DN's view of which NN is active based on heartbeat responses
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Key: HDFS-2627
URL: https://issues.apache.org/jira/browse/HDFS-2627
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node, ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
This is the first part of the design described in [this
comment|https://issues.apache.org/jira/browse/HDFS-1972?focusedCommentId=13160601&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13160601]
in HDFS-1972. When the DNs start, they should not consider either of the NNs
in a block pool to be the active one. Rather, the NNs should include their HA
state as part of the heartbeat response to the DN, and the DN will believe
whichever NN claims to be active at a higher transaction ID.
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