/*
* Copyright 2012 NGDATA nv
*
* Licensed 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 com.ngdata.sep.impl;
import javax.management.ObjectName;
import org.apache.hadoop.metrics.MetricsContext;
import org.apache.hadoop.metrics.MetricsRecord;
import org.apache.hadoop.metrics.MetricsUtil;
import org.apache.hadoop.metrics.Updater;
import org.apache.hadoop.metrics.util.MBeanUtil;
import org.apache.hadoop.metrics.util.MetricsBase;
import org.apache.hadoop.metrics.util.MetricsDynamicMBeanBase;
import org.apache.hadoop.metrics.util.MetricsLongValue;
import org.apache.hadoop.metrics.util.MetricsRegistry;
import org.apache.hadoop.metrics.util.MetricsTimeVaryingRate;
/**
* Metrics for the Side-Effect Processor (SEP) system.
*/
public class SepMetrics implements Updater {
private final String recordName;
private final MetricsRegistry metricsRegistry;
private final MetricsRecord metricsRecord;
private final MetricsContext context;
private final SepMetricsMXBean mbean;
// Processing rate for SEP actions for which we actually do something (i.e. after filtering)
private final MetricsTimeVaryingRate sepProcessingRate;
// The write timestamp of the last SEP information that came in
private final MetricsLongValue lastTimestampInputProcessed;
public SepMetrics(String recordName) {
this.recordName = recordName;
metricsRegistry = new MetricsRegistry();
sepProcessingRate = new MetricsTimeVaryingRate("sepProcessed", metricsRegistry);
lastTimestampInputProcessed = new MetricsLongValue("lastSepTimestamp", metricsRegistry);
context = MetricsUtil.getContext("repository");
metricsRecord = MetricsUtil.createRecord(context, recordName);
context.registerUpdater(this);
mbean = new SepMetricsMXBean(this.metricsRegistry);
}
public void shutdown() {
context.unregisterUpdater(this);
mbean.shutdown();
}
/**
* Report that a filtered SEP operation has been processed. This method should only be called to
* report SEP operations that have been processed after making it through the filtering process.
*
* @param duration The number of millisecods spent handling the SEP operation
*/
public void reportFilteredSepOperation(long duration) {
sepProcessingRate.inc(duration);
}
/**
* Report the original write timestamp of a SEP operation that was received. Assuming that SEP
* operations are delivered in the same order as they are originally written in HBase (which
* will always be the case except for when a region split or move takes place), this metric will always
* hold the write timestamp of the most recent operation in HBase that has been handled by the SEP system.
*
* @param timestamp The write timestamp of the last SEP operation
*/
public void reportSepTimestamp(long writeTimestamp) {
lastTimestampInputProcessed.set(writeTimestamp);
}
@Override
public void doUpdates(MetricsContext unused) {
synchronized (this) {
for (MetricsBase m : metricsRegistry.getMetricsList()) {
m.pushMetric(metricsRecord);
}
}
metricsRecord.update();
}
public class SepMetricsMXBean extends MetricsDynamicMBeanBase {
private final ObjectName mbeanName;
public SepMetricsMXBean(MetricsRegistry registry) {
super(registry, "HBase Side-Effect Processor Metrics");
mbeanName = MBeanUtil.registerMBean("SEP", recordName, this);
}
public void shutdown() {
if (mbeanName != null)
MBeanUtil.unregisterMBean(mbeanName);
}
}
}