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From "Andrey Stepachev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11290) Unlock RegionStates
Date Thu, 11 Sep 2014 16:43:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130263#comment-14130263
] 

Andrey Stepachev commented on HBASE-11290:
------------------------------------------

[~virag] compilation fails. applied patch to branch1 (it applies cleanly) but got compilation
error
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile
(default-compile) on project hbase-server: Compilation failure
[ERROR] HBASE-11290/hbase.git/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java:[771,20]
error: cannot find symbol

It didn't find RegionStates#setLastRegionServerOfRegion method


> Unlock RegionStates
> -------------------
>
>                 Key: HBASE-11290
>                 URL: https://issues.apache.org/jira/browse/HBASE-11290
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Francis Liu
>            Assignee: Virag Kothari
>         Attachments: HBASE-11290-0.98.patch, HBASE-11290.draft.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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