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https://issues.apache.org/jira/browse/YARN-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258881#comment-14258881
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Rohith commented on YARN-2992:
------------------------------
It makes sense to me. +1 for the issue.
And also I would like to bring up the scenario where ZK is not available during
RM start up. I have observed that RM exits while starting if ZK is not
available. Why RM can not be transit to standby?
> ZKRMStateStore crashes due to session expiry
> --------------------------------------------
>
> Key: YARN-2992
> URL: https://issues.apache.org/jira/browse/YARN-2992
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.6.0
> Reporter: Karthik Kambatla
> Assignee: Karthik Kambatla
> Priority: Blocker
> Attachments: yarn-2992-1.patch
>
>
> We recently saw the RM crash with the following stacktrace. On session
> expiry, we should gracefully transition to standby.
> {noformat}
> 2014-12-18 06:28:42,689 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Received a
> org.apache.hadoop.yarn.server.resourcemanager.RMFatalEvent of type
> STATE_STORE_OP_FAILED. Cause:
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode
> = Session expired
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:127)
> at org.apache.zookeeper.ZooKeeper.multiInternal(ZooKeeper.java:931)
> at org.apache.zookeeper.ZooKeeper.multi(ZooKeeper.java:911)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:930)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:927)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1069)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1088)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doMultiWithRetries(ZKRMStateStore.java:927)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doMultiWithRetries(ZKRMStateStore.java:941)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.setDataWithRetries(ZKRMStateStore.java:958)
>
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.updateApplicationAttemptStateInternal(ZKRMStateStore.java:687)
>
> {noformat}
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