Daniel Templeton created YARN-5685:
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Summary: Non-embedded HA failover is broken
Key: YARN-5685
URL: https://issues.apache.org/jira/browse/YARN-5685
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Affects Versions: 3.0.0-alpha1, 2.9.0
Reporter: Daniel Templeton
Assignee: Daniel Templeton
Priority: Critical
YARN-4559 broke RM HA when embedded automatic failover is disabled. The
{{ZKRMStateStore}} will now only start its monitoring thread when automatic
failover not enabled (which is patently useless). I presume the intended
change was to have the monitoring thread started when automatic failover is not
*embedded*.
If HA is enabled with automatic failover enabled and embedded failover
disabled, all RMs all come up in standby state. To make one of them active,
the {{--forcemanual}} flag must be used when manually triggering the state
change. Should the active go down, the standby will not become active and must
be manually transitioned with the {{--forcemanual}} flag.
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