001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.client;
019
020import static org.apache.hadoop.hbase.util.ConcurrentMapUtils.computeIfAbsent;
021
022import java.util.concurrent.ConcurrentHashMap;
023import org.apache.hadoop.conf.Configuration;
024import org.apache.hadoop.hbase.HConstants;
025import org.apache.hadoop.hbase.ServerName;
026import org.apache.hadoop.hbase.client.backoff.ServerStatistics;
027import org.apache.yetus.audience.InterfaceAudience;
028
029/**
030 * Tracks the statistics for multiple regions
031 */
032@InterfaceAudience.Private
033public class ServerStatisticTracker implements StatisticTrackable {
034
035  private final ConcurrentHashMap<ServerName, ServerStatistics> stats = new ConcurrentHashMap<>();
036
037  @Override
038  public void updateRegionStats(ServerName server, byte[] region, RegionLoadStats currentStats) {
039    computeIfAbsent(stats, server, ServerStatistics::new).update(region, currentStats);
040  }
041
042  public ServerStatistics getStats(ServerName server) {
043    return this.stats.get(server);
044  }
045
046  public static ServerStatisticTracker create(Configuration conf) {
047    if (
048      !conf.getBoolean(HConstants.ENABLE_CLIENT_BACKPRESSURE,
049        HConstants.DEFAULT_ENABLE_CLIENT_BACKPRESSURE)
050    ) {
051      return null;
052    }
053    return new ServerStatisticTracker();
054  }
055}