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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 Thu, 14 Dec 2017 00:09:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290123#comment-16290123
] 

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

TestRestartCluster#testRetainAssignmentOnRestart is broken because when we create AssignProcedures
now, we populate them w/ target servers. Doing this blows our retaining old locations (if
no target specified, when AssignProcedure runs, it will try to use the new form of the old
location -- which is how we get our retention). Over in HBASE-19501 we noticed that ServerCrashProcedure
depends on this and made a version of assign procedures that works for SCP. Let me do the
same here by reinstituting the old bulk assign method for SCP to use.

This seems to have fixed all tests. Let me post new patch to be sure.

> 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.master.002.patch, HBASE-18946.master.003.patch,
HBASE-18946.master.004.patch, HBASE-18946.master.005.patch, HBASE-18946.master.006.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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