hadoop Quantile 源码
haddop Quantile 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/util/Quantile.java
/**
* 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.metrics2.util;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.thirdparty.com.google.common.collect.ComparisonChain;
/**
* Specifies a quantile (with error bounds) to be watched by a
* {@link SampleQuantiles} object.
*/
@InterfaceAudience.Private
public class Quantile implements Comparable<Quantile> {
public final double quantile;
public final double error;
public Quantile(double quantile, double error) {
this.quantile = quantile;
this.error = error;
}
@Override
public boolean equals(Object aThat) {
if (this == aThat) {
return true;
}
if (!(aThat instanceof Quantile)) {
return false;
}
Quantile that = (Quantile) aThat;
long qbits = Double.doubleToLongBits(quantile);
long ebits = Double.doubleToLongBits(error);
return qbits == Double.doubleToLongBits(that.quantile)
&& ebits == Double.doubleToLongBits(that.error);
}
@Override
public int hashCode() {
return (int) (Double.doubleToLongBits(quantile) ^ Double
.doubleToLongBits(error));
}
@Override
public int compareTo(Quantile other) {
return ComparisonChain.start()
.compare(quantile, other.quantile)
.compare(error, other.error)
.result();
}
@Override
public String toString() {
return String.format("%.2f %%ile +/- %.2f%%",
quantile * 100, error * 100);
}
}
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