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https://issues.apache.org/jira/browse/HBASE-18946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293190#comment-16293190
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Hudson commented on HBASE-18946:
--------------------------------
FAILURE: Integrated in Jenkins build HBase-Trunk_matrix #4231 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/4231/])
HBASE-18946 Stochastic load balancer assigns replica regions to the same
(stack: rev 010012cbcb3064b78b9e184a2808bbd26ea80903)
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionTransitionProcedure.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/EnableTableProcedure.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/RecoverMetaProcedure.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/CreateTableProcedure.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/AbstractTestDLS.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/executor/ExecutorService.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignProcedure.java
* (edit)
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestMasterFailover.java
* (add)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionReplicasWithRestartScenarios.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransactionOnCluster.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/ZKNamespaceManager.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/assignment/TestAssignmentManager.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRegionsOnMasterOptions.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionMergeTransactionOnCluster.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/TruncateTableProcedure.java
* (edit)
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRSKilledWhenInitializing.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/CloneSnapshotProcedure.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java
* (add)
hbase-server/src/test/java/org/apache/hadoop/hbase/master/snapshot/TestAssignProcedure.java
* (edit)
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/MoveRegionProcedure.java
> 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: stack
> 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.master.007.patch,
> HBASE-18946.master.008.patch, HBASE-18946.master.009.patch,
> HBASE-18946.master.010.patch, HBASE-18946.master.011.patch,
> HBASE-18946.master.012.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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