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https://issues.apache.org/jira/browse/HBASE-18946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16278916#comment-16278916
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stack edited comment on HBASE-18946 at 12/5/17 5:32 PM:
--------------------------------------------------------
Thanks [~anoop.hbase] for the intervention. I was thinking this progress and
though I understood what is happening here but plain now that I did not.
So back to square one.
Can we give the replicas as a group to the LB and have it queue them as a
group? I've not looked. But replicas being split over assignment queues w/o a
global coordination --
and we do NOT want global coordination because we want the assignment queues
to run w/o need of coordination so they run fast -- seems to be root problem?
Will I have a go at it [~ram_krish]? <= Just because I've been in this AMv2
mess a good while now....
Thanks boss.
was (Author: stack):
Thanks [~anoop.hbase] for the intervention. I was thinking this progress and
though I understood what is happening here but plain now that I did not.
So back to square one.
Can we give the replicas as a group to the LB and have it queue them as a
group? I've not looked. But replicas being split over assignment queues w/o a
global coordination --
and we do NOT want global coordination because we want the assignment queues
to run w/o need of coordination so they run fast -- seems to be root problem?
Will I have a go at it [~ram_krish]?
Thanks boss.
> 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,
> 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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