[HBASE-23006] RSGroupBasedLoadBalancer should also try to place replicas for the same region to different region servers

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0, 2.3.0, 2.1.7, 2.2.2
• Component/s: Region Assignment, rsgroup
• Hadoop Flags: Reviewed
• Assignee: Duo Zhang
• Reporter: Duo Zhang
• Created: 10/Sep/19 10:31
• Updated: 12/Sep/19 04:41
• Resolved: 11/Sep/19 10:40

Description

Found this when implementing HBASE-22971. TestSCPWithReplicas fails when RSGroupBasedLoadBalancer is enabled.

And this can be reproduced by a UT on master branch too. I think the problem is that in RSGroupBasedLoadBalancer.retainAssignment we do not consider region replicas.

We should fix this.

Issue Links

• links to: GitHub Pull Request #605