[jira] [Created] (YARN-5709) Cleanup Curator-based leader election code

["Karthik Kambatla (JIRA)" <ji...@apache.org>]

Karthik Kambatla created YARN-5709:
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             Summary: 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
            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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