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Kafka on Pulsar implemented using Pulsar Protocol Handler
/**
* 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 io.streamnative.pulsar.handlers.kop.stats;
import io.prometheus.client.Collector;
import io.prometheus.client.Collector.MetricFamilySamples;
import io.prometheus.client.Collector.MetricFamilySamples.Sample;
import io.prometheus.client.CollectorRegistry;
import java.util.Enumeration;
import java.util.Map;
import org.apache.pulsar.common.util.SimpleTextOutputStream;
/**
* Logic to write metrics in Prometheus text format.
*/
public class PrometheusTextFormatUtil {
public static void writeGauge(SimpleTextOutputStream w, String name, SimpleGauge gauge) {
// Example:
// # TYPE bookie_storage_entries_count gauge
// bookie_storage_entries_count 519
w.write("# TYPE ").write(name).write(" gauge\n");
w.write(name);
writeLabels(w, gauge.getLabels());
w.write(' ').write(gauge.getSample().toString()).write('\n');
}
public static void writeCounter(SimpleTextOutputStream w, String name, LongAdderCounter counter) {
// Example:
// # TYPE jvm_threads_started_total counter
// jvm_threads_started_total 59
w.write("# TYPE ").write(name).write(" counter\n");
w.write(name);
writeLabels(w, counter.getLabels());
w.write(' ').write(counter.get().toString()).write('\n');
}
public static void writeOpStat(SimpleTextOutputStream w, String name, DataSketchesOpStatsLogger opStat) {
// Example:
// # TYPE bookie_journal_JOURNAL_ADD_ENTRY summary
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.5",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.75",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.95",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.99",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.999",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="0.9999",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY{success="false",quantile="1.0",} NaN
// bookie_journal_JOURNAL_ADD_ENTRY_count{success="false",} 0.0
// bookie_journal_JOURNAL_ADD_ENTRY_sum{success="false",} 0.0
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.5",} 1.706
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.75",} 1.89
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.95",} 2.121
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.99",} 10.708
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.999",} 10.902
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="0.9999",} 10.902
// bookie_journal_JOURNAL_ADD_ENTRY{success="true",quantile="1.0",} 10.902
// bookie_journal_JOURNAL_ADD_ENTRY_count{success="true",} 658.0
// bookie_journal_JOURNAL_ADD_ENTRY_sum{success="true",} 1265.0800000000002
w.write("# TYPE ").write(name).write(" summary\n");
writeQuantile(w, opStat, name, false, 0.5);
writeQuantile(w, opStat, name, false, 0.75);
writeQuantile(w, opStat, name, false, 0.95);
writeQuantile(w, opStat, name, false, 0.99);
writeQuantile(w, opStat, name, false, 0.999);
writeQuantile(w, opStat, name, false, 0.9999);
writeQuantile(w, opStat, name, false, 1.0);
writeCount(w, opStat, name, false);
writeSum(w, opStat, name, false);
writeQuantile(w, opStat, name, true, 0.5);
writeQuantile(w, opStat, name, true, 0.75);
writeQuantile(w, opStat, name, true, 0.95);
writeQuantile(w, opStat, name, true, 0.99);
writeQuantile(w, opStat, name, true, 0.999);
writeQuantile(w, opStat, name, true, 0.9999);
writeQuantile(w, opStat, name, true, 1.0);
writeCount(w, opStat, name, true);
writeSum(w, opStat, name, true);
}
private static void writeQuantile(SimpleTextOutputStream w, DataSketchesOpStatsLogger opStat, String name,
boolean success, double quantile) {
w.write(name)
.write("{success=\"").write(success)
.write("\",quantile=\"").write(Double.toString(quantile));
if (!opStat.getLabels().isEmpty()) {
w.write("\", ");
writeLabelsNoBraces(w, opStat.getLabels());
} else {
w.write("\"");
}
w.write("} ")
.write(Double.toString(opStat.getQuantileValue(success, quantile))).write('\n');
}
private static void writeCount(SimpleTextOutputStream w, DataSketchesOpStatsLogger opStat, String name,
boolean success) {
w.write(name).write("_count{success=\"").write(success);
if (!opStat.getLabels().isEmpty()) {
w.write("\", ");
writeLabelsNoBraces(w, opStat.getLabels());
} else {
w.write("\"");
}
w.write("} ")
.write(Long.toString(opStat.getCount(success))).write('\n');
}
private static void writeSum(SimpleTextOutputStream w, DataSketchesOpStatsLogger opStat, String name,
boolean success) {
w.write(name).write("_sum{success=\"").write(success);
if (!opStat.getLabels().isEmpty()) {
w.write("\", ");
writeLabelsNoBraces(w, opStat.getLabels());
} else {
w.write("\"");
}
w.write("} ")
.write(Double.toString(opStat.getSum(success))).write('\n');
}
public static void writeMetricsCollectedByPrometheusClient(SimpleTextOutputStream w, CollectorRegistry registry) {
Enumeration metricFamilySamples = registry.metricFamilySamples();
while (metricFamilySamples.hasMoreElements()) {
MetricFamilySamples metricFamily = metricFamilySamples.nextElement();
for (int i = 0; i < metricFamily.samples.size(); i++) {
Sample sample = metricFamily.samples.get(i);
w.write(sample.name);
w.write('{');
for (int j = 0; j < sample.labelNames.size(); j++) {
if (j != 0) {
w.write(", ");
}
w.write(sample.labelNames.get(j));
w.write("=\"");
w.write(sample.labelValues.get(j));
w.write('"');
}
w.write("} ");
w.write(Collector.doubleToGoString(sample.value));
w.write('\n');
}
}
}
private static void writeLabels(SimpleTextOutputStream w, Map labels) {
if (labels.isEmpty()) {
return;
}
w.write('{');
writeLabelsNoBraces(w, labels);
w.write('}');
}
private static void writeLabelsNoBraces(SimpleTextOutputStream w, Map labels) {
if (labels.isEmpty()) {
return;
}
boolean isFirst = true;
for (Map.Entry e : labels.entrySet()) {
if (!isFirst) {
w.write(',');
}
isFirst = false;
w.write(e.getKey())
.write("=\"")
.write(e.getValue())
.write('"');
}
}
}