HBASE-25288 Make MasterRpcServices not extends RSRpcServices and also HMaster not extends HRegionServer

Author: Apache9

hbase-server/src/main/java/org/apache/hadoop/hbase/HBaseRpcServicesBase.java

@@ -49,7 +49,9 @@ public interface Server extends Abortable, Stoppable {
    * Important note: this method returns a reference to Connection which is managed
    * by Server itself, so callers must NOT attempt to close connection obtained.
    */
-  Connection getConnection();
+  default Connection getConnection() {
+    return getAsyncConnection().toConnection();
+  }
 
   Connection createConnection(Configuration conf) throws IOException;
 

hbase-server/src/main/java/org/apache/hadoop/hbase/HBaseServerBase.java

@@ -21,8 +21,8 @@
 import java.util.HashMap;
 import java.util.Map;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.hbase.HBaseRpcServicesBase;
 import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.regionserver.RSRpcServices;
 import org.apache.hadoop.hbase.security.User;
 import org.apache.yetus.audience.InterfaceAudience;
 
@@ -52,7 +52,7 @@
 // RegionSpecifier object. Methods can be invoked on the returned object
 // to figure out whether it is a meta region or not.
 @InterfaceAudience.Private
-public abstract class AnnotationReadingPriorityFunction<T extends RSRpcServices>
+public abstract class AnnotationReadingPriorityFunction<T extends HBaseRpcServicesBase<?>>
   implements PriorityFunction {
 
   protected final Map<String, Integer> annotatedQos;

hbase-server/src/main/java/org/apache/hadoop/hbase/Server.java

@@ -24,6 +24,7 @@
 import java.util.concurrent.CountDownLatch;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
+import org.apache.hadoop.hbase.HBaseServerBase;
 import org.apache.hadoop.hbase.Server;
 import org.apache.hadoop.hbase.regionserver.HRegionServer;
 import org.apache.hadoop.hbase.security.HBasePolicyProvider;
@@ -79,7 +80,7 @@ public NettyRpcServer(Server server, String name, List<BlockingServiceAndInterfa
     EventLoopGroup eventLoopGroup;
     Class<? extends ServerChannel> channelClass;
     if (server instanceof HRegionServer) {
-      NettyEventLoopGroupConfig config = ((HRegionServer) server).getEventLoopGroupConfig();
+      NettyEventLoopGroupConfig config = ((HBaseServerBase) server).getEventLoopGroupConfig();
       eventLoopGroup = config.group();
       channelClass = config.serverChannelClass();
     } else {