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ramkrishna.s.vasudevan commented on HBASE-18946: ------------------------------------------------ bq.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? Yes that is the problem. and pls note that none of the LB is responsible for this. If you pass all the replica regions as a group it will work fine becuae it will just do a pure round robin and nothing based on the actual replica knowledge. > 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]. -- This message was sent by Atlassian JIRA (v6.4.14#64029)