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From "zhihai xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4209) RMStateStore FENCED state doesn’t work
Date Mon, 28 Sep 2015 07:44:04 GMT

     [ https://issues.apache.org/jira/browse/YARN-4209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

zhihai xu updated YARN-4209:
    Affects Version/s:     (was: 2.7.1)

> 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
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>            Priority: Critical
>         Attachments: YARN-4209.000.patch
> 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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