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https://issues.apache.org/jira/browse/HBASE-11290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15262635#comment-15262635
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Mikhail Antonov commented on HBASE-11290:
-----------------------------------------

[~toffer] btw, in the WIP patch to HBASE-15648 I had an implementation of 
multi-lock similar to IdLock, but re-entrant and allowing to synchronize on any 
objects, not just longs. Would it be useful? 

> Unlock RegionStates
> -------------------
>
>                 Key: HBASE-11290
>                 URL: https://issues.apache.org/jira/browse/HBASE-11290
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 1.2.0, 1.3.0
>            Reporter: Francis Liu
>            Assignee: Francis Liu
>             Fix For: 2.0.0, 1.4.0, 0.98.20
>
>         Attachments: HBASE-11290-0.98.patch, HBASE-11290-0.98_v2.patch, 
> HBASE-11290.draft.patch, HBASE-11290_trunk.patch
>
>
> 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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