zhihai xu created YARN-4209:
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Summary: RMStateStore FENCED state doesn’t work
Key: YARN-4209
URL: https://issues.apache.org/jira/browse/YARN-4209
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager
Affects Versions: 2.7.1
Reporter: zhihai xu
Assignee: zhihai xu
Priority: Critical
RMStateStore FENCED state doesn’t work. The reason is
{{stateMachine.doTransition}} called from {{updateFencedState}} is embedded in
{{stateMachine.doTransition}} called from public
API(removeRMDelegationToken...) or {{ForwardingEventHandler#handle}}. So right
after the internal state transition from {{updateFencedState}} changes the
state to FENCED state, the external state transition changes the state back to
ACTIVE state. The end result is that RMStateStore is still in ACTIVE state even
notifyStoreOperationFailed is called. The only working case for FENCED state is
{{notifyStoreOperationFailed}} called from
{{ZKRMStateStore#VerifyActiveStatusThread}}.
For example: {{removeRMDelegationToken}} => {{handleStoreEvent}} => enter
external {{stateMachine.doTransition}} => {{RemoveRMDTTransition}} =>
{{notifyStoreOperationFailed}} =>{{updateFencedState}}=>{{handleStoreEvent}}=>
enter internal {{stateMachine.doTransition}} => exit internal
{{stateMachine.doTransition}} change state to FENCED => exit external
{{stateMachine.doTransition}} change state to ACTIVE.
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