HDFS-5776 Support 'hedged' reads in DFSClient
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1571467 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs;
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import java.util.concurrent.atomic.AtomicLong;
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/**
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* The client-side metrics for hedged read feature.
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* This class has a number of metrics variables that are publicly accessible,
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* we can grab them from client side, like HBase.
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*/
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public class DFSHedgedReadMetrics {
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public AtomicLong hedgedReadOps = new AtomicLong();
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public AtomicLong hedgedReadOpsWin = new AtomicLong();
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public AtomicLong hedgedReadOpsInCurThread = new AtomicLong();
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public void incHedgedReadOps() {
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hedgedReadOps.incrementAndGet();
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}
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public void incHedgedReadOpsInCurThread() {
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hedgedReadOpsInCurThread.incrementAndGet();
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}
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public void incHedgedReadWins() {
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hedgedReadOpsWin.incrementAndGet();
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}
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public long getHedgedReadOps() {
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return hedgedReadOps.longValue();
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}
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public long getHedgedReadOpsInCurThread() {
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return hedgedReadOpsInCurThread.longValue();
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}
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public long getHedgedReadWins() {
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return hedgedReadOpsWin.longValue();
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}
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}
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