HA: ZK-based FailoverController
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Key: HDFS-2185
URL: https://issues.apache.org/jira/browse/HDFS-2185
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Eli Collins
Assignee: Eli Collins
This jira is for a ZK-based FailoverController daemon. The FailoverController
is a separate daemon from the NN that does the following:
* Initiates leader election (via ZK) when necessary
* Performs health monitoring (aka failure detection)
* Performs fail-over (standby to active and active to standby transitions)
* Heartbeats to ensure the liveness
It should have the same/similar interface as the Linux HA RM to aid
pluggability.
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