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.hdfs;
019
020import java.util.concurrent.atomic.AtomicLong;
021
022/**
023 * The client-side metrics for hedged read feature.
024 * This class has a number of metrics variables that are publicly accessible,
025 * we can grab them from client side, like HBase.
026 */
027public class DFSHedgedReadMetrics {
028  public final AtomicLong hedgedReadOps = new AtomicLong();
029  public final AtomicLong hedgedReadOpsWin = new AtomicLong();
030  public final AtomicLong hedgedReadOpsInCurThread = new AtomicLong();
031
032  public void incHedgedReadOps() {
033    hedgedReadOps.incrementAndGet();
034  }
035
036  public void incHedgedReadOpsInCurThread() {
037    hedgedReadOpsInCurThread.incrementAndGet();
038  }
039
040  public void incHedgedReadWins() {
041    hedgedReadOpsWin.incrementAndGet();
042  }
043
044  public long getHedgedReadOps() {
045    return hedgedReadOps.longValue();
046  }
047
048  public long getHedgedReadOpsInCurThread() {
049    return hedgedReadOpsInCurThread.longValue();
050  }
051
052  public long getHedgedReadWins() {
053    return hedgedReadOpsWin.longValue();
054  }
055}