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https://issues.apache.org/jira/browse/YARN-3798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14590574#comment-14590574
 ] 

Tsuyoshi Ozawa commented on YARN-3798:
--------------------------------------

[~varun_saxena] thank you for your review. It helps me a lot.

{quote}
Moreover, there can be a case when a particular zookeeper server is forever 
down. In this case also, we will keep on getting ConnectionLoss IIUC till 
retries exhaust.
{quote}

It looks exhaust, but it's not: reconnection to other ZooKeeper servers are 
done at ClientCnxn#startConnect in a main thread of ZooKeeper's client. Please 
note that a session is not equal to a connection in ZooKeeper. What we can do 
it to retry with current zookeeper client. I also noticed that we shouldn't 
create new session when SESSIONMOVED occurs. Updating a patch soon.

{quote}
So to handle these cases, I think we should retry with new connection atleast 
once. Thoughts ?
{quote}

I think we shouldn't create new ZooKeeper session unless SESSIONEXPIRED occurs: 
from http://wiki.apache.org/hadoop/ZooKeeper/FAQ : 
{quote}
Only create a new session when you are notified of session expiration 
(mandatory)
{quote}

> RM shutdown with NoNode exception while updating appAttempt on zk
> -----------------------------------------------------------------
>
>                 Key: YARN-3798
>                 URL: https://issues.apache.org/jira/browse/YARN-3798
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>         Environment: Suse 11 Sp3
>            Reporter: Bibin A Chundatt
>            Assignee: Varun Saxena
>            Priority: Blocker
>         Attachments: RM.log, YARN-3798-branch-2.7.patch
>
>
> RM going down with NoNode exception during create of znode for appattempt
> *Please find the exception logs*
> {code}
> 2015-06-09 10:09:44,732 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore: 
> ZKRMStateStore Session connected
> 2015-06-09 10:09:44,732 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore: 
> ZKRMStateStore Session restored
> 2015-06-09 10:09:44,886 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore: 
> Exception while executing a ZK operation.
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:115)
>       at org.apache.zookeeper.ZooKeeper.multiInternal(ZooKeeper.java:1405)
>       at org.apache.zookeeper.ZooKeeper.multi(ZooKeeper.java:1310)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:926)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1101)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1122)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:937)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.createWithRetries(ZKRMStateStore.java:970)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.updateApplicationAttemptStateInternal(ZKRMStateStore.java:671)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:275)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:260)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.handleStoreEvent(RMStateStore.java:837)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:900)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:895)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:175)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:108)
>       at java.lang.Thread.run(Thread.java:745)
> 2015-06-09 10:09:44,887 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore: Maxed 
> out ZK retries. Giving up!
> 2015-06-09 10:09:44,887 ERROR 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore: Error 
> updating appAttempt: appattempt_1433764310492_7152_000001
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:115)
>       at org.apache.zookeeper.ZooKeeper.multiInternal(ZooKeeper.java:1405)
>       at org.apache.zookeeper.ZooKeeper.multi(ZooKeeper.java:1310)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:926)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1101)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1122)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:937)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.createWithRetries(ZKRMStateStore.java:970)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.updateApplicationAttemptStateInternal(ZKRMStateStore.java:671)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:275)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:260)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.handleStoreEvent(RMStateStore.java:837)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:900)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:895)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:175)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:108)
>       at java.lang.Thread.run(Thread.java:745)
> 2015-06-09 10:09:44,898 INFO 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore: Updating 
> info for app: application_1433764310492_7152
> 2015-06-09 10:09:44,898 FATAL 
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Received a 
> org.apache.hadoop.yarn.server.resourcemanager.RMFatalEvent of type 
> STATE_STORE_OP_FAILED. Cause:
> org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
>       at org.apache.zookeeper.KeeperException.create(KeeperException.java:115)
>       at org.apache.zookeeper.ZooKeeper.multiInternal(ZooKeeper.java:1405)
>       at org.apache.zookeeper.ZooKeeper.multi(ZooKeeper.java:1310)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:926)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$4.run(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1101)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1122)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:923)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.doStoreMultiWithRetries(ZKRMStateStore.java:937)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.createWithRetries(ZKRMStateStore.java:970)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.updateApplicationAttemptStateInternal(ZKRMStateStore.java:671)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:275)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppAttemptTransition.transition(RMStateStore.java:260)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
>       at 
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.handleStoreEvent(RMStateStore.java:837)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:900)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:895)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:175)
>       at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:108)
>       at java.lang.Thread.run(Thread.java:745)
> 2015-06-09 10:09:44,920 INFO org.apache.hadoop.util.ExitUtil: Exiting with 
> status 1
> {code}
> Zk leader process down has happened almost at the same time 
> On startup of  zk process znode for application was available
> *Current*
> RM going down and Job failure
> *Expected*
>  Submitted Job can fail but RM shutdown i not required



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