[jira] [Created] (HBASE-19367) Refactoring in RegionStates, and RSProcedureDispatcher

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

Appy created HBASE-19367:
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             Summary: Refactoring in RegionStates, and RSProcedureDispatcher
                 Key: HBASE-19367
                 URL: https://issues.apache.org/jira/browse/HBASE-19367
             Project: HBase
          Issue Type: Improvement
            Reporter: Appy
            Assignee: Appy
            Priority: Minor


Working on a bug fix, was in these parts for first time to understand new AM and trying to make sense of things. Did a few improvements on the way.

- Adding javadoc comments
- Bug: ServerStateNode#regions is HashSet but there's no synchronization to prevent concurrent add/removes. Let's use concurrent set instead.
- Use getRegionsInTransitionCount() directly to avoid instead of getRegionsInTransition().size() because the latter copies everything into a new array - what a waste for just the size.
- There's mixed use of getRegionNode and getRegionStateNode for same return type - RegionStateNode. Changing everything to getRegionStateNode. Similarly rename other *RegionNode() fns to *RegionStateNode().
- RegionStateNode#transitionState() return value is useless since it always returns it's first param.
- Other minor improvements



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