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DataNodeMetrics.java
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/
DataNodeMetrics.java
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/**
* 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.server.datanode.metrics;
import java.util.Random;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.metrics2.MetricsSystem;
import org.apache.hadoop.metrics2.annotation.Metric;
import org.apache.hadoop.metrics2.annotation.Metrics;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.lib.MetricsRegistry;
import org.apache.hadoop.metrics2.lib.MutableCounterLong;
import org.apache.hadoop.metrics2.lib.MutableRate;
import org.apache.hadoop.metrics2.source.JvmMetrics;
import static org.apache.hadoop.metrics2.impl.MsInfo.*;
/**
*
* This class is for maintaining the various DataNode statistics
* and publishing them through the metrics interfaces.
* This also registers the JMX MBean for RPC.
* <p>
* This class has a number of metrics variables that are publicly accessible;
* these variables (objects) have methods to update their values;
* for example:
* <p> {@link #blocksRead}.inc()
*
*/
@InterfaceAudience.Private
@Metrics(about="DataNode metrics", context="dfs")
public class DataNodeMetrics {
@Metric MutableCounterLong bytesWritten;
@Metric MutableCounterLong bytesRead;
@Metric MutableCounterLong blocksWritten;
@Metric MutableCounterLong blocksRead;
@Metric MutableCounterLong blocksReplicated;
@Metric MutableCounterLong blocksRemoved;
@Metric MutableCounterLong blocksVerified;
@Metric MutableCounterLong blockVerificationFailures;
@Metric MutableCounterLong readsFromLocalClient;
@Metric MutableCounterLong readsFromRemoteClient;
@Metric MutableCounterLong writesFromLocalClient;
@Metric MutableCounterLong writesFromRemoteClient;
@Metric MutableCounterLong volumeFailures;
@Metric MutableRate readBlockOp;
@Metric MutableRate writeBlockOp;
@Metric MutableRate blockChecksumOp;
@Metric MutableRate copyBlockOp;
@Metric MutableRate replaceBlockOp;
@Metric MutableRate heartbeats;
@Metric MutableRate blockReports;
final MetricsRegistry registry = new MetricsRegistry("datanode");
final String name;
static final Random rng = new Random();
public DataNodeMetrics(String name, String sessionId) {
this.name = name;
registry.tag(SessionId, sessionId);
}
public static DataNodeMetrics create(Configuration conf, String dnName) {
String sessionId = conf.get(DFSConfigKeys.DFS_METRICS_SESSION_ID_KEY);
MetricsSystem ms = DefaultMetricsSystem.instance();
JvmMetrics.create("DataNode", sessionId, ms);
String name = "DataNodeActivity-"+ (dnName.isEmpty()
? "UndefinedDataNodeName"+ rng.nextInt() : dnName.replace(':', '-'));
return ms.register(name, null, new DataNodeMetrics(name, sessionId));
}
public String name() { return name; }
public void addHeartbeat(long latency) {
heartbeats.add(latency);
}
public void addBlockReport(long latency) {
blockReports.add(latency);
}
public void incrBlocksReplicated(int delta) {
blocksReplicated.incr(delta);
}
public void incrBlocksWritten() {
blocksWritten.incr();
}
public void incrBlocksRemoved(int delta) {
blocksRemoved.incr(delta);
}
public void incrBytesWritten(int delta) {
bytesWritten.incr(delta);
}
public void incrBlockVerificationFailures() {
blockVerificationFailures.incr();
}
public void incrBlocksVerified() {
blocksVerified.incr();
}
public void addReadBlockOp(long latency) {
readBlockOp.add(latency);
}
public void addWriteBlockOp(long latency) {
writeBlockOp.add(latency);
}
public void addReplaceBlockOp(long latency) {
replaceBlockOp.add(latency);
}
public void addCopyBlockOp(long latency) {
copyBlockOp.add(latency);
}
public void addBlockChecksumOp(long latency) {
blockChecksumOp.add(latency);
}
public void incrBytesRead(int delta) {
bytesRead.incr(delta);
}
public void incrBlocksRead() {
blocksRead.incr();
}
public void shutdown() {
DefaultMetricsSystem.shutdown();
}
public void incrWritesFromClient(boolean local) {
(local ? writesFromLocalClient : writesFromRemoteClient).incr();
}
public void incrReadsFromClient(boolean local) {
(local ? readsFromLocalClient : readsFromRemoteClient).incr();
}
public void incrVolumeFailures() {
volumeFailures.incr();
}
}