huaxiangsun commented on a change in pull request #2643:
URL: https://github.com/apache/hbase/pull/2643#discussion_r526257820



##########
File path: 
hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncNonMetaRegionLocator.java
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@@ -89,7 +91,10 @@
 
   private final int locatePrefetchLimit;
 
-  private final boolean useMetaReplicas;
+  // The mode tells if HedgedRead, LoadBalance mode is supported.
+  // The default mode is CatalogReplicaMode.None.
+  private CatalogReplicaMode metaReplicaMode;
+  private CatalogReplicaLoadBalanceSelector metaReplicaSelector;

Review comment:
       As explained above.




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