/**
* 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.dfs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.metrics.MetricsRecord;
import org.apache.hadoop.metrics.MetricsUtil;
import org.apache.hadoop.metrics.MetricsContext;
import org.apache.hadoop.metrics.Updater;
import org.apache.hadoop.metrics.jvm.JvmMetrics;
class NameNodeMetrics implements Updater {
private final MetricsRecord metricsRecord;
private int numFilesCreated = 0;
private int numFilesOpened = 0;
private int numFilesRenamed = 0;
private int numFilesListed = 0;
private int numTransactions = 0;
private int totalTimeTransactionsLogMemory = 0;
private int numSyncs = 0;
private int totalTimeSyncs = 0;
NameNodeMetrics(Configuration conf) {
String sessionId = conf.get("session.id");
// Initiate Java VM metrics
JvmMetrics.init("NameNode", sessionId);
// Create a record for NameNode metrics
MetricsContext metricsContext = MetricsUtil.getContext("dfs");
metricsRecord = MetricsUtil.createRecord(metricsContext, "namenode");
metricsRecord.setTag("sessionId", sessionId);
metricsContext.registerUpdater(this);
}
/**
* Since this object is a registered updater, this method will be called
* periodically, e.g. every 5 seconds.
*/
public void doUpdates(MetricsContext unused) {
synchronized (this) {
metricsRecord.incrMetric("files_created", numFilesCreated);
metricsRecord.incrMetric("files_opened", numFilesOpened);
metricsRecord.incrMetric("files_renamed", numFilesRenamed);
metricsRecord.incrMetric("files_listed", numFilesListed);
metricsRecord.incrMetric("num_transactions", numTransactions);
metricsRecord.incrMetric("avg_time_transactions_memory",
getAverageTimeTransaction());
metricsRecord.incrMetric("num_syncs", numSyncs);
metricsRecord.incrMetric("avg_time_transactions_sync",
getAverageTimeSync());
numFilesCreated = 0;
numFilesOpened = 0;
numFilesRenamed = 0;
numFilesListed = 0;
numTransactions = 0;
totalTimeTransactionsLogMemory = 0;
numSyncs = 0;
totalTimeSyncs = 0;
}
metricsRecord.update();
}
synchronized void createFile() {
++numFilesCreated;
}
synchronized void openFile() {
++numFilesOpened;
}
synchronized void renameFile() {
++numFilesRenamed;
}
synchronized void listFile(int nfiles) {
numFilesListed += nfiles;
}
synchronized void incrNumTransactions(int count, int time) {
numTransactions += count;
totalTimeTransactionsLogMemory += time;
}
synchronized void incrSyncs(int count, int time) {
numSyncs += count;
totalTimeSyncs += time;
}
synchronized private int getAverageTimeTransaction() {
if (numTransactions == 0) {
return 0;
}
return totalTimeTransactionsLogMemory/numTransactions;
}
synchronized private int getAverageTimeSync() {
if (numSyncs == 0) {
return 0;
}
return totalTimeSyncs/numSyncs;
}
}