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https://issues.apache.org/jira/browse/HBASE-18946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216905#comment-16216905
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Anoop Sam John commented on HBASE-18946:
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bq.When the Balancer is passed a List, could it look at the list first to find
replicas and group?
Similar thing I was also asking above.
bq. Should we make it with all the replica regions go in one request? While
reading the code on region replica, that time itself this Q came to me. Then
fat logic for not putting 2 regions of same replica in one RS can be avoided.
Not sue how easy/difficult it is. Just saying
Right now to the LB we pass each region one by one and ask it to find a RS for
assign. Instead will it be possible to pass all replicas of a given region
together in a List and make the LB to find RS for each of it?
> 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.patch, HBASE-18946.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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