[jira] [Commented] (HBASE-11290) Unlock RegionStates

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

    [ https://issues.apache.org/jira/browse/HBASE-11290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259758#comment-15259758 ] 

Mikhail Antonov commented on HBASE-11290:
-----------------------------------------

Unfortunately, I don't think I have any bandwidth to review it :( and this change would require thorough review/testing..

[~toffer], [~stack], [~eclark] - what do you guys think? I'm going to bump to 1.4 if we can't get it in.

> 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, 1.3.0, 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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