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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.ipc.controller;
19  
20  import java.util.List;
21  
22  import org.apache.hadoop.conf.Configuration;
23  import org.apache.hadoop.hbase.CellScannable;
24  import org.apache.hadoop.hbase.CellScanner;
25  import org.apache.hadoop.hbase.ipc.PayloadCarryingRpcController;
26  import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
27  
28  /**
29   * {@link RpcControllerFactory} that should only be used when making remote RPCs to the region
30   * servers. This prevents deadlocks by having RS to RS traffic handled by higher priorities
31   * queues. This controller factory shouldn't be globally configured anywhere and is meant to be
32   * used only internally by Omid.
33   */
34  public class InterRegionServerRpcControllerFactory extends RpcControllerFactory {
35  
36      public InterRegionServerRpcControllerFactory(Configuration conf) {
37          super(conf);
38      }
39  
40      @Override
41      public PayloadCarryingRpcController newController() {
42          PayloadCarryingRpcController delegate = super.newController();
43          return getController(delegate);
44      }
45  
46      @Override
47      public PayloadCarryingRpcController newController(CellScanner cellScanner) {
48          PayloadCarryingRpcController delegate = super.newController(cellScanner);
49          return getController(delegate);
50      }
51  
52      @Override
53      public PayloadCarryingRpcController newController(List<CellScannable> cellIterables) {
54          PayloadCarryingRpcController delegate = super.newController(cellIterables);
55          return getController(delegate);
56      }
57  
58      private PayloadCarryingRpcController getController(PayloadCarryingRpcController delegate) {
59          // construct a chain of controllers
60          return new InterRegionServerRpcController(delegate, conf);
61      }
62  
63  }