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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18946) Stochastic load balancer assigns replica regions to the same RS
Date Tue, 12 Dec 2017 06:23:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287181#comment-16287181
] 

stack commented on HBASE-18946:
-------------------------------

.001 is NOT done yet. Posting WIP. Builds on [~ram_krish] findings and explorations. Added
method to AM to bulk create AssignProcedures. Passes bulk to balancer to get placement. Some
cleanup of a dodgy force assign flag. Will doc better tomorrow. Just posting what I have at
mo.

> Stochastic load balancer assigns replica regions to the same RS
> ---------------------------------------------------------------
>
>                 Key: HBASE-18946
>                 URL: https://issues.apache.org/jira/browse/HBASE-18946
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0-alpha-3
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-18946.master.001.patch, HBASE-18946.patch, HBASE-18946.patch,
HBASE-18946_2.patch, HBASE-18946_2.patch, HBASE-18946_simple_7.patch, HBASE-18946_simple_8.patch,
TestRegionReplicasWithRestartScenarios.java
>
>
> Trying out region replica and its assignment I can see that some times the default LB
Stocahstic load balancer assigns replica regions to the same RS. This happens when we have
3 RS checked in and we have a table with 3 replicas. When a RS goes down then the replicas
being assigned to same RS is acceptable but the case when we have enough RS to assign this
behaviour is undesirable and does not solve the purpose of replicas. 
> [~huaxiang] and [~enis]. 



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