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https://issues.apache.org/jira/browse/HBASE-11290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14016857#comment-14016857
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Jimmy Xiang commented on HBASE-11290:
-------------------------------------

FYI. I am working on some low hanging fruits in HBASE-11059, without data 
structure change.

> Unlock RegionStates
> -------------------
>
>                 Key: HBASE-11290
>                 URL: https://issues.apache.org/jira/browse/HBASE-11290
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Francis Liu
>            Assignee: Francis Liu
>
> Even though RegionStates is a highly accessed data structure in HMaster. Most 
> of it's methods are synchronized. Which limits concurrency. Even simply 
> making some of the getters non-synchronized by using concurrent data 
> structures has helped with region assignments. We can go as simple as this 
> approach or create locks per region or a bucket lock per region bucket.



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