[HBASE-20265] Host regions in other rsgroup when all region servers in a rsgroup are all down

• Type: Improvement
• Status: Resolved
• Priority: Critical
• Resolution: Won't Fix
• Component/s: rsgroup
• Assignee: Unassigned
• Reporter: Xiang Li
• Created: 23/Mar/18 13:36
• Updated: 11/Jun/22 20:41
• Resolved: 11/Jun/22 20:41

Description

We met the following scenario in our production system:
rsgroup A hosts user table 1 as well as system tables (let's say hbase:rsgroup, or hbase:meta). Several heavy reads on user table 1 make all region servers within rsgroup A crash. As a result, the system tables have no host.
Under such scenario, we could manually move the system tables to another rsgroup.
But what about:
We provide an affinity or last resort. When all region servers in rsgroup A crash, rsgroup B, as rsgroup A's affinity, will take over all tables of rsgroup A, or at least, some important tables.