Karthik Kambatla commented on YARN-2962:

[~varun_saxena] - it will indeed be backwards incompatible. We should get this 
into trunk. To include this in branch-2, we should probably guard this with a 
config, and users will have to format the store to start using this. Otherwise, 
an RM restart will fail. 

> ZKRMStateStore: Limit the number of znodes under a znode
> --------------------------------------------------------
>                 Key: YARN-2962
>                 URL: https://issues.apache.org/jira/browse/YARN-2962
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.6.0
>            Reporter: Karthik Kambatla
>            Assignee: Varun Saxena
>            Priority: Critical
> We ran into this issue where we were hitting the default ZK server message 
> size configs, primarily because the message had too many znodes even though 
> they individually they were all small.

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