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https://issues.apache.org/jira/browse/YARN-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13857386#comment-13857386
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Karthik Kambatla commented on YARN-1029:
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bq. Please take care of it wherever appropriate.
Re-opened YARN-1481 to take care of it there. If it isn't too much trouble,
please take a look at it.
bq. Again, if we organize the newly added code such that its a common event for
any module to inform the RM about a fatal error then we are good for the
future. Embedded elector can use that event instead of a custom named event.
Oh! I understand it now - will add a RMFatalErrorEvent, the handler for which
just terminates the RM. And, update RMStateStoreOperationFailedEvent to use
that event instead of calling terminate directly.
bq. I am sorry I could not understand your comment explaining how the test
passes with these timeouts.
# ZK timeout comes from RM_ZK_TIMEOUT_MS (2 seconds), the failover could take
as long as this. MiniYARNCluster#getActiveRMIndex() waits for this duration to
find the active RM.
# NM->RM connection is verified after a successful failover. The timeout there
corresponds to the maximum time taken by failovers until the NM connects to an
RM. 5 seconds seems a long enough time for this.
> Allow embedding leader election into the RM
> -------------------------------------------
>
> Key: YARN-1029
> URL: https://issues.apache.org/jira/browse/YARN-1029
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Bikas Saha
> Assignee: Karthik Kambatla
> Attachments: embedded-zkfc-approach.patch, yarn-1029-0.patch,
> yarn-1029-0.patch, yarn-1029-1.patch, yarn-1029-2.patch, yarn-1029-3.patch,
> yarn-1029-4.patch, yarn-1029-approach.patch
>
>
> It should be possible to embed common ActiveStandyElector into the RM such
> that ZooKeeper based leader election and notification is in-built. In
> conjunction with a ZK state store, this configuration will be a simple
> deployment option.
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