Author: stack
Date: Mon Feb 24 22:34:55 2014
New Revision: 1571467
URL: http://svn.apache.org/r1571467
Log:
HDFS-5776 Support 'hedged' reads in DFSClient
Added:
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.java
Added:
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.java
URL:
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.java?rev=1571467&view=auto
==============================================================================
---
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.java
(added)
+++
hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSHedgedReadMetrics.java
Mon Feb 24 22:34:55 2014
@@ -0,0 +1,55 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * The client-side metrics for hedged read feature.
+ * This class has a number of metrics variables that are publicly accessible,
+ * we can grab them from client side, like HBase.
+ */
+public class DFSHedgedReadMetrics {
+ public AtomicLong hedgedReadOps = new AtomicLong();
+ public AtomicLong hedgedReadOpsWin = new AtomicLong();
+ public AtomicLong hedgedReadOpsInCurThread = new AtomicLong();
+
+ public void incHedgedReadOps() {
+ hedgedReadOps.incrementAndGet();
+ }
+
+ public void incHedgedReadOpsInCurThread() {
+ hedgedReadOpsInCurThread.incrementAndGet();
+ }
+
+ public void incHedgedReadWins() {
+ hedgedReadOpsWin.incrementAndGet();
+ }
+
+ public long getHedgedReadOps() {
+ return hedgedReadOps.longValue();
+ }
+
+ public long getHedgedReadOpsInCurThread() {
+ return hedgedReadOpsInCurThread.longValue();
+ }
+
+ public long getHedgedReadWins() {
+ return hedgedReadOpsWin.longValue();
+ }
+}
