hbase-client/src/main/java/org/apache/hadoop/hbase/client/ServerStatisticTracker.java

   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.client;
  19
  20 import static org.apache.hadoop.hbase.util.ConcurrentMapUtils.computeIfAbsent;
  21
  22 import java.util.concurrent.ConcurrentHashMap;
  23 import org.apache.hadoop.conf.Configuration;
  24 import org.apache.hadoop.hbase.HConstants;
  25 import org.apache.hadoop.hbase.ServerName;
  26 import org.apache.hadoop.hbase.client.backoff.ServerStatistics;
  27 import org.apache.yetus.audience.InterfaceAudience;
  28
  29 /**
  30  * Tracks the statistics for multiple regions
  31  */
  32 @InterfaceAudience.Private
  33 public class ServerStatisticTracker implements StatisticTrackable {
  34
  35   private final ConcurrentHashMap<ServerName, ServerStatistics> stats = new ConcurrentHashMap<>();
  36
  37   @Override
  38   public void updateRegionStats(ServerName server, byte[] region, RegionLoadStats currentStats) {
  39     computeIfAbsent(stats, server, ServerStatistics::new).update(region, currentStats);
  40   }
  41
  42   public ServerStatistics getStats(ServerName server) {
  43     return this.stats.get(server);
  44   }
  45
  46   public static ServerStatisticTracker create(Configuration conf) {
  47     if (!conf.getBoolean(HConstants.ENABLE_CLIENT_BACKPRESSURE,
  48         HConstants.DEFAULT_ENABLE_CLIENT_BACKPRESSURE)) {
  49       return null;
  50     }
  51     return new ServerStatisticTracker();
  52   }
  53 }