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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.regionserver.throttle;
19  
20  import org.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  import org.apache.hadoop.conf.Configuration;
23  import org.apache.hadoop.hbase.HBaseInterfaceAudience;
24  import org.apache.hadoop.hbase.classification.InterfaceAudience;
25  import org.apache.hadoop.hbase.regionserver.RegionServerServices;
26  import org.apache.hadoop.util.ReflectionUtils;
27  
28  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
29  public final class FlushThroughputControllerFactory {
30  
31    private static final Log LOG = LogFactory.getLog(FlushThroughputControllerFactory.class);
32  
33    public static final String HBASE_FLUSH_THROUGHPUT_CONTROLLER_KEY =
34        "hbase.regionserver.flush.throughput.controller";
35  
36    private static final Class<? extends ThroughputController>
37        DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS = NoLimitThroughputController.class;
38  
39    private FlushThroughputControllerFactory() {
40    }
41  
42    public static ThroughputController create(RegionServerServices server,
43        Configuration conf) {
44      Class<? extends ThroughputController> clazz = getThroughputControllerClass(conf);
45      ThroughputController controller = ReflectionUtils.newInstance(clazz, conf);
46      controller.setup(server);
47      return controller;
48    }
49  
50    public static Class<? extends ThroughputController> getThroughputControllerClass(
51        Configuration conf) {
52      String className =
53          conf.get(HBASE_FLUSH_THROUGHPUT_CONTROLLER_KEY,
54            DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS.getName());
55      try {
56        return Class.forName(className).asSubclass(ThroughputController.class);
57      } catch (Exception e) {
58        LOG.warn(
59          "Unable to load configured flush throughput controller '" + className
60              + "', load default throughput controller "
61              + DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS.getName() + " instead", e);
62        return DEFAULT_FLUSH_THROUGHPUT_CONTROLLER_CLASS;
63      }
64    }
65  }