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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.regionserver;
20  
21  import java.io.IOException;
22  import java.util.ArrayList;
23  import java.util.List;
24  
25  import org.apache.hadoop.hbase.HBaseConfiguration;
26  import org.apache.hadoop.hbase.client.Put;
27  import org.apache.hadoop.hbase.client.Durability;
28  import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
29  import org.apache.hadoop.hbase.protobuf.RequestConverter;
30  import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutateRequest;
31  
32  import com.google.protobuf.ServiceException;
33  
34  /**
35   * A region server that will OOME.
36   * Everytime {@link #put(regionName, Durability)} is called, we add
37   * keep around a reference to the batch.  Use this class to test OOME extremes.
38   * Needs to be started manually as in
39   * <code>${HBASE_HOME}/bin/hbase ./bin/hbase org.apache.hadoop.hbase.OOMERegionServer start</code>.
40   */
41  public class OOMERegionServer extends HRegionServer {
42    private List<Put> retainer = new ArrayList<Put>();
43  
44    public OOMERegionServer(HBaseConfiguration conf) throws IOException, InterruptedException {
45      super(conf);
46    }
47  
48    public void put(byte [] regionName, Put put)
49    throws IOException {
50      try {
51        MutateRequest request =
52          RequestConverter.buildMutateRequest(regionName, put);
53        super.mutate(null, request);
54        for (int i = 0; i < 30; i++) {
55          // Add the batch update 30 times to bring on the OOME faster.
56          this.retainer.add(put);
57        }
58      } catch (ServiceException se) {
59        throw ProtobufUtil.getRemoteException(se);
60      }
61    }
62  
63    public static void main(String[] args) {
64      new HRegionServerCommandLine(OOMERegionServer.class).doMain(args);
65    }
66  }