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[FLINK-7608][metrics] Rework latency metric
This closes apache#5161.
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...untime/src/main/java/org/apache/flink/runtime/metrics/DescriptiveStatisticsHistogram.java
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| @@ -0,0 +1,50 @@ | ||
| /* | ||
| * 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:https://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.flink.runtime.metrics; | ||
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| import org.apache.flink.metrics.Histogram; | ||
| import org.apache.flink.metrics.HistogramStatistics; | ||
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| import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics; | ||
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| /** | ||
| * The {@link DescriptiveStatisticsHistogram} use a DescriptiveStatistics {@link DescriptiveStatistics} as a Flink {@link Histogram}. | ||
| */ | ||
| public class DescriptiveStatisticsHistogram implements org.apache.flink.metrics.Histogram { | ||
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| private final DescriptiveStatistics descriptiveStatistics; | ||
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| public DescriptiveStatisticsHistogram(int windowSize) { | ||
| this.descriptiveStatistics = new DescriptiveStatistics(windowSize); | ||
| } | ||
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| @Override | ||
| public void update(long value) { | ||
| this.descriptiveStatistics.addValue(value); | ||
| } | ||
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| @Override | ||
| public long getCount() { | ||
| return this.descriptiveStatistics.getN(); | ||
| } | ||
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| @Override | ||
| public HistogramStatistics getStatistics() { | ||
| return new DescriptiveStatisticsHistogramStatistics(this.descriptiveStatistics); | ||
| } | ||
| } |
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.../main/java/org/apache/flink/runtime/metrics/DescriptiveStatisticsHistogramStatistics.java
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|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| * 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:https://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.flink.runtime.metrics; | ||
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| import org.apache.flink.metrics.HistogramStatistics; | ||
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| import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics; | ||
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| import java.util.Arrays; | ||
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| /** | ||
| * DescriptiveStatistics histogram statistics implementation returned by {@link DescriptiveStatisticsHistogram}. | ||
| * The statistics class wraps a {@link DescriptiveStatistics} instance and forwards the method calls accordingly. | ||
| */ | ||
| public class DescriptiveStatisticsHistogramStatistics extends HistogramStatistics { | ||
| private final DescriptiveStatistics descriptiveStatistics; | ||
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| public DescriptiveStatisticsHistogramStatistics(DescriptiveStatistics latencyHistogram) { | ||
| this.descriptiveStatistics = latencyHistogram; | ||
| } | ||
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| @Override | ||
| public double getQuantile(double quantile) { | ||
| return descriptiveStatistics.getPercentile(quantile * 100); | ||
| } | ||
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| @Override | ||
| public long[] getValues() { | ||
| return Arrays.stream(descriptiveStatistics.getValues()).mapToLong(i -> (long) i).toArray(); | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| return (int) descriptiveStatistics.getN(); | ||
| } | ||
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| @Override | ||
| public double getMean() { | ||
| return descriptiveStatistics.getMean(); | ||
| } | ||
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| @Override | ||
| public double getStdDev() { | ||
| return descriptiveStatistics.getStandardDeviation(); | ||
| } | ||
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| @Override | ||
| public long getMax() { | ||
| return (long) descriptiveStatistics.getMax(); | ||
| } | ||
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| @Override | ||
| public long getMin() { | ||
| return (long) descriptiveStatistics.getMin(); | ||
| } | ||
| } |
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