kafka KafkaConsumerMetrics 源码
kafka KafkaConsumerMetrics 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/consumer/internals/KafkaConsumerMetrics.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.
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package org.apache.kafka.clients.consumer.internals;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.metrics.Measurable;
import org.apache.kafka.common.metrics.Metrics;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.common.metrics.stats.Avg;
import org.apache.kafka.common.metrics.stats.CumulativeSum;
import org.apache.kafka.common.metrics.stats.Max;
import java.util.concurrent.TimeUnit;
public class KafkaConsumerMetrics implements AutoCloseable {
private final MetricName lastPollMetricName;
private final Sensor timeBetweenPollSensor;
private final Sensor pollIdleSensor;
private final Sensor committedSensor;
private final Sensor commitSyncSensor;
private final Metrics metrics;
private long lastPollMs;
private long pollStartMs;
private long timeSinceLastPollMs;
public KafkaConsumerMetrics(Metrics metrics, String metricGrpPrefix) {
this.metrics = metrics;
String metricGroupName = metricGrpPrefix + "-metrics";
Measurable lastPoll = (mConfig, now) -> {
if (lastPollMs == 0L)
// if no poll is ever triggered, just return -1.
return -1d;
else
return TimeUnit.SECONDS.convert(now - lastPollMs, TimeUnit.MILLISECONDS);
};
this.lastPollMetricName = metrics.metricName("last-poll-seconds-ago",
metricGroupName, "The number of seconds since the last poll() invocation.");
metrics.addMetric(lastPollMetricName, lastPoll);
this.timeBetweenPollSensor = metrics.sensor("time-between-poll");
this.timeBetweenPollSensor.add(metrics.metricName("time-between-poll-avg",
metricGroupName,
"The average delay between invocations of poll() in milliseconds."),
new Avg());
this.timeBetweenPollSensor.add(metrics.metricName("time-between-poll-max",
metricGroupName,
"The max delay between invocations of poll() in milliseconds."),
new Max());
this.pollIdleSensor = metrics.sensor("poll-idle-ratio-avg");
this.pollIdleSensor.add(metrics.metricName("poll-idle-ratio-avg",
metricGroupName,
"The average fraction of time the consumer's poll() is idle as opposed to waiting for the user code to process records."),
new Avg());
this.commitSyncSensor = metrics.sensor("commit-sync-time-ns-total");
this.commitSyncSensor.add(
metrics.metricName(
"commit-sync-time-ns-total",
metricGroupName,
"The total time the consumer has spent in commitSync in nanoseconds"
),
new CumulativeSum()
);
this.committedSensor = metrics.sensor("committed-time-ns-total");
this.committedSensor.add(
metrics.metricName(
"committed-time-ns-total",
metricGroupName,
"The total time the consumer has spent in committed in nanoseconds"
),
new CumulativeSum()
);
}
public void recordPollStart(long pollStartMs) {
this.pollStartMs = pollStartMs;
this.timeSinceLastPollMs = lastPollMs != 0L ? pollStartMs - lastPollMs : 0;
this.timeBetweenPollSensor.record(timeSinceLastPollMs);
this.lastPollMs = pollStartMs;
}
public void recordPollEnd(long pollEndMs) {
long pollTimeMs = pollEndMs - pollStartMs;
double pollIdleRatio = pollTimeMs * 1.0 / (pollTimeMs + timeSinceLastPollMs);
this.pollIdleSensor.record(pollIdleRatio);
}
public void recordCommitSync(long duration) {
this.commitSyncSensor.record(duration);
}
public void recordCommitted(long duration) {
this.committedSensor.record(duration);
}
@Override
public void close() {
metrics.removeMetric(lastPollMetricName);
metrics.removeSensor(timeBetweenPollSensor.name());
metrics.removeSensor(pollIdleSensor.name());
metrics.removeSensor(commitSyncSensor.name());
metrics.removeSensor(committedSensor.name());
}
}
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