Daniel Templeton reassigned YARN-5709:

    Assignee: Daniel Templeton

> Cleanup Curator-based leader election code
> ------------------------------------------
>                 Key: YARN-5709
>                 URL: https://issues.apache.org/jira/browse/YARN-5709
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Karthik Kambatla
>            Assignee: Daniel Templeton
>            Priority: Critical
> While reviewing YARN-5677 and YARN-5694, I noticed we could make the 
> curator-based election code cleaner. It is nicer to get this fixed in 2.8 
> before we ship it, but this can be done at a later time as well. 
> # By EmbeddedElector, we meant it was running as part of the RM daemon. Since 
> the Curator-based elector is also running embedded, I feel the code should be 
> checking for {{!curatorBased}} instead of {{isEmbeddedElector}}
> # {{LeaderElectorService}} should probably be named 
> {{CuratorBasedEmbeddedElectorService}} or some such.
> # The code that initializes the elector should be at the same place 
> irrespective of whether it is curator-based or not. 
> # We seem to be caching the CuratorFramework instance in RM. It makes more 
> sense for it to be in RMContext. If others are okay with it, we might even be 
> better of having {{RMContext#getCurator()}} method to lazily create the 
> curator framework and then cache it. 

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