Apache9 commented on a change in pull request #1206: HBASE-23890 Update the 
rsgroup section in our ref guide
URL: https://github.com/apache/hbase/pull/1206#discussion_r384454712
 
 

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 File path: src/main/asciidoc/_chapters/ops_mgt.adoc
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 @@ -3479,6 +3478,27 @@ To enable ACL, add the following to your hbase-site.xml 
and restart your Master:
 <property>
 ----
 
+=== Migrating From Old Implementation
+The coprocessor `org.apache.hadoop.hbase.rsgroup.RSGroupAdminEndpoint` is
+deprected, but for compatible, if you want the pre 3.0.0 hbase client/shell
+to communicate with the new hbase cluster, you still need to add this
+coprocessor to master. And if this coprocessor is specified, the
+`hbase.balancer.rsgroup.enabled` flag will be set to true automatically to
 
 Review comment:
   Checked the ref guide, we haven't mentioned much about the balancer class I 
think making the top level balancer to be RSGroupBasedLoadBalancer can be 
considered as an 'implementation detail' so do not mention it in ref guide is 
fine I think.

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