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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.metrics.impl;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.Arrays;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.concurrent.atomic.LongAdder;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.stream.Stream;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.metrics.Snapshot;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.util.AtomicUtils;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.yetus.audience.InterfaceStability;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span><a name="line.28"></a> |
| <span class="sourceLineNo">029</span>/**<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * FastLongHistogram is a thread-safe class that estimate distribution of data and computes the<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * quantiles.<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> */<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>@InterfaceAudience.Private<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>@InterfaceStability.Evolving<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>public class FastLongHistogram {<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span> /**<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * Default number of bins.<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> public static final int DEFAULT_NBINS = 255;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> public static final double[] DEFAULT_QUANTILES =<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> new double[] { 0.25, 0.5, 0.75, 0.90, 0.95, 0.98, 0.99, 0.999 };<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> /**<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * Bins is a class containing a list of buckets(or bins) for estimation histogram of some data.<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> */<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private static class Bins {<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private final LongAdder[] counts;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> // inclusive<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> private final long binsMin;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> // exclusive<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> private final long binsMax;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> private final long bins10XMax;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> private final AtomicLong min = new AtomicLong(Long.MAX_VALUE);<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> private final AtomicLong max = new AtomicLong(0L);<a name="line.57"></a> |
| <span class="sourceLineNo">058</span><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> private final LongAdder count = new LongAdder();<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> private final LongAdder total = new LongAdder();<a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span> // set to true when any of data has been inserted to the Bins. It is set after the counts are<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> // updated.<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> private volatile boolean hasData = false;<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> /**<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * The constructor for creating a Bins without any prior data.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> */<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> public Bins(int numBins) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> counts = createCounters(numBins);<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> this.binsMin = 1L;<a name="line.71"></a> |
| <span class="sourceLineNo">072</span><a name="line.72"></a> |
| <span class="sourceLineNo">073</span> // These two numbers are total guesses<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> // and should be treated as highly suspect.<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> this.binsMax = 1000;<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> this.bins10XMax = binsMax * 10;<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> }<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /**<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * The constructor for creating a Bins with last Bins.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> */<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> public Bins(Bins last, int numBins, double minQ, double maxQ) {<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> long[] values = last.getQuantiles(new double[] { minQ, maxQ });<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> long wd = values[1] - values[0] + 1;<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> // expand minQ and maxQ in two ends back assuming uniform distribution<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> this.binsMin = Math.max(0L, (long) (values[0] - wd * minQ));<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> long binsMax = (long) (values[1] + wd * (1 - maxQ)) + 1;<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> // make sure each of bins is at least of width 1<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> this.binsMax = Math.max(binsMax, this.binsMin + numBins);<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> this.bins10XMax = Math.max((long) (values[1] + (binsMax - 1) * 9), this.binsMax + 1);<a name="line.90"></a> |
| <span class="sourceLineNo">091</span><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> this.counts = createCounters(numBins);<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span><a name="line.94"></a> |
| <span class="sourceLineNo">095</span> private LongAdder[] createCounters(int numBins) {<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> return Stream.generate(LongAdder::new).limit(numBins + 3).toArray(LongAdder[]::new);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> private int getIndex(long value) {<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> if (value < this.binsMin) {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> return 0;<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> } else if (value > this.bins10XMax) {<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> return this.counts.length - 1;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> } else if (value >= this.binsMax) {<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> return this.counts.length - 2;<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> }<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> // compute the position<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> return 1<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> + (int) ((value - this.binsMin) * (this.counts.length - 3) / (this.binsMax - this.binsMin));<a name="line.109"></a> |
| <span class="sourceLineNo">110</span><a name="line.110"></a> |
| <span class="sourceLineNo">111</span> }<a name="line.111"></a> |
| <span class="sourceLineNo">112</span><a name="line.112"></a> |
| <span class="sourceLineNo">113</span> /**<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> * Adds a value to the histogram.<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> */<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> public void add(long value, long count) {<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> if (value < 0) {<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> // The whole computation is completely thrown off if there are negative numbers<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> //<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> // Normally we would throw an IllegalArgumentException however this is the metrics<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> // system and it should be completely safe at all times.<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> // So silently throw it away.<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> return;<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> }<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> AtomicUtils.updateMin(min, value);<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> AtomicUtils.updateMax(max, value);<a name="line.126"></a> |
| <span class="sourceLineNo">127</span><a name="line.127"></a> |
| <span class="sourceLineNo">128</span> this.count.add(count);<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> this.total.add(value * count);<a name="line.129"></a> |
| <span class="sourceLineNo">130</span><a name="line.130"></a> |
| <span class="sourceLineNo">131</span> int pos = getIndex(value);<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> this.counts[pos].add(count);<a name="line.132"></a> |
| <span class="sourceLineNo">133</span><a name="line.133"></a> |
| <span class="sourceLineNo">134</span> // hasData needs to be updated as last<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> this.hasData = true;<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> }<a name="line.136"></a> |
| <span class="sourceLineNo">137</span><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> /**<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> * Computes the quantiles give the ratios.<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> */<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "FL_FLOATS_AS_LOOP_COUNTERS",<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> justification = "valid usage")<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> public long[] getQuantiles(double[] quantiles) {<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> if (!hasData) {<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> // No data yet.<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> return new long[quantiles.length];<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> }<a name="line.147"></a> |
| <span class="sourceLineNo">148</span><a name="line.148"></a> |
| <span class="sourceLineNo">149</span> // Make a snapshot of lowerCounter, higherCounter and bins.counts to counts.<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> // This is not synchronized, but since the counter are accumulating, the result is a good<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> // estimation of a snapshot.<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> long[] counts = new long[this.counts.length];<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> long total = 0L;<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> for (int i = 0; i < this.counts.length; i++) {<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> counts[i] = this.counts[i].sum();<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> total += counts[i];<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> }<a name="line.157"></a> |
| <span class="sourceLineNo">158</span><a name="line.158"></a> |
| <span class="sourceLineNo">159</span> int rIndex = 0;<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> double qCount = total * quantiles[0];<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> long cum = 0L;<a name="line.161"></a> |
| <span class="sourceLineNo">162</span><a name="line.162"></a> |
| <span class="sourceLineNo">163</span> long[] res = new long[quantiles.length];<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> countsLoop: for (int i = 0; i < counts.length; i++) {<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> // mn and mx define a value range<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> long mn, mx;<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> if (i == 0) {<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> mn = this.min.get();<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> mx = this.binsMin;<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> } else if (i == counts.length - 1) {<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> mn = this.bins10XMax;<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> mx = this.max.get();<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> } else if (i == counts.length - 2) {<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> mn = this.binsMax;<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> mx = this.bins10XMax;<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> } else {<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> mn = this.binsMin + (i - 1) * (this.binsMax - this.binsMin) / (this.counts.length - 3);<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> mx = this.binsMin + i * (this.binsMax - this.binsMin) / (this.counts.length - 3);<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> }<a name="line.179"></a> |
| <span class="sourceLineNo">180</span><a name="line.180"></a> |
| <span class="sourceLineNo">181</span> if (mx < this.min.get()) {<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> continue;<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> }<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> if (mn > this.max.get()) {<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> break;<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> }<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> mn = Math.max(mn, this.min.get());<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> mx = Math.min(mx, this.max.get());<a name="line.188"></a> |
| <span class="sourceLineNo">189</span><a name="line.189"></a> |
| <span class="sourceLineNo">190</span> // lastCum/cum are the corresponding counts to mn/mx<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> double lastCum = cum;<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> cum += counts[i];<a name="line.192"></a> |
| <span class="sourceLineNo">193</span><a name="line.193"></a> |
| <span class="sourceLineNo">194</span> // fill the results for qCount is within current range.<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> while (qCount <= cum) {<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> if (cum == lastCum) {<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> res[rIndex] = mn;<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> } else {<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> res[rIndex] = (long) ((qCount - lastCum) * (mx - mn) / (cum - lastCum) + mn);<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> }<a name="line.200"></a> |
| <span class="sourceLineNo">201</span><a name="line.201"></a> |
| <span class="sourceLineNo">202</span> // move to next quantile<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> rIndex++;<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> if (rIndex >= quantiles.length) {<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> break countsLoop;<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> }<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> qCount = total * quantiles[rIndex];<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> }<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> }<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> // In case quantiles contains values >= 100%<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> for (; rIndex < quantiles.length; rIndex++) {<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> res[rIndex] = this.max.get();<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> }<a name="line.213"></a> |
| <span class="sourceLineNo">214</span><a name="line.214"></a> |
| <span class="sourceLineNo">215</span> return res;<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> }<a name="line.216"></a> |
| <span class="sourceLineNo">217</span><a name="line.217"></a> |
| <span class="sourceLineNo">218</span> long getNumAtOrBelow(long val) {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> return Arrays.stream(counts).mapToLong(c -> c.sum()).limit(getIndex(val) + 1).sum();<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> }<a name="line.220"></a> |
| <span class="sourceLineNo">221</span><a name="line.221"></a> |
| <span class="sourceLineNo">222</span> public long getMin() {<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> long min = this.min.get();<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> return min == Long.MAX_VALUE ? 0 : min; // in case it is not initialized<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> }<a name="line.225"></a> |
| <span class="sourceLineNo">226</span><a name="line.226"></a> |
| <span class="sourceLineNo">227</span> public long getMean() {<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> long count = this.count.sum();<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> long total = this.total.sum();<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> if (count == 0) {<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> return 0;<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> }<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> return total / count;<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> }<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> }<a name="line.235"></a> |
| <span class="sourceLineNo">236</span><a name="line.236"></a> |
| <span class="sourceLineNo">237</span> // The bins counting values. It is replaced with a new one in calling of reset().<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> private volatile Bins bins;<a name="line.238"></a> |
| <span class="sourceLineNo">239</span><a name="line.239"></a> |
| <span class="sourceLineNo">240</span> /**<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> * Constructor.<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> */<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> public FastLongHistogram() {<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> this(DEFAULT_NBINS);<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> }<a name="line.245"></a> |
| <span class="sourceLineNo">246</span><a name="line.246"></a> |
| <span class="sourceLineNo">247</span> /**<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> * Constructor.<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> * results but with lower efficiency, and vice versus.<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> */<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> public FastLongHistogram(int numOfBins) {<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> this.bins = new Bins(numOfBins);<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> }<a name="line.254"></a> |
| <span class="sourceLineNo">255</span><a name="line.255"></a> |
| <span class="sourceLineNo">256</span> /**<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> * Constructor setting the bins assuming a uniform distribution within a range.<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> * results but with lower efficiency, and vice versus.<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> * @param min lower bound of the region, inclusive.<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> * @param max higher bound of the region, inclusive.<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> */<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> public FastLongHistogram(int numOfBins, long min, long max) {<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> this(numOfBins);<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> Bins bins = new Bins(numOfBins);<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> bins.add(min, 1);<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> bins.add(max, 1);<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> this.bins = new Bins(bins, numOfBins, 0.01, 0.999);<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> }<a name="line.269"></a> |
| <span class="sourceLineNo">270</span><a name="line.270"></a> |
| <span class="sourceLineNo">271</span> /**<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> * Adds a value to the histogram.<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> */<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> public void add(long value, long count) {<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> this.bins.add(value, count);<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> }<a name="line.276"></a> |
| <span class="sourceLineNo">277</span><a name="line.277"></a> |
| <span class="sourceLineNo">278</span> /**<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> * Computes the quantiles give the ratios.<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> */<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> public long[] getQuantiles(double[] quantiles) {<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> return this.bins.getQuantiles(quantiles);<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> }<a name="line.283"></a> |
| <span class="sourceLineNo">284</span><a name="line.284"></a> |
| <span class="sourceLineNo">285</span> public long[] getQuantiles() {<a name="line.285"></a> |
| <span class="sourceLineNo">286</span> return this.bins.getQuantiles(DEFAULT_QUANTILES);<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> }<a name="line.287"></a> |
| <span class="sourceLineNo">288</span><a name="line.288"></a> |
| <span class="sourceLineNo">289</span> public long getMin() {<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> return this.bins.getMin();<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> }<a name="line.291"></a> |
| <span class="sourceLineNo">292</span><a name="line.292"></a> |
| <span class="sourceLineNo">293</span> public long getMax() {<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> return this.bins.max.get();<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> }<a name="line.295"></a> |
| <span class="sourceLineNo">296</span><a name="line.296"></a> |
| <span class="sourceLineNo">297</span> public long getCount() {<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> return this.bins.count.sum();<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> }<a name="line.299"></a> |
| <span class="sourceLineNo">300</span><a name="line.300"></a> |
| <span class="sourceLineNo">301</span> public long getMean() {<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> return this.bins.getMean();<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> }<a name="line.303"></a> |
| <span class="sourceLineNo">304</span><a name="line.304"></a> |
| <span class="sourceLineNo">305</span> public long getNumAtOrBelow(long value) {<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> return this.bins.getNumAtOrBelow(value);<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> }<a name="line.307"></a> |
| <span class="sourceLineNo">308</span><a name="line.308"></a> |
| <span class="sourceLineNo">309</span> /**<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> * Resets the histogram for new counting.<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> */<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> public Snapshot snapshotAndReset() {<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> final Bins oldBins = this.bins;<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> this.bins = new Bins(this.bins, this.bins.counts.length - 3, 0.01, 0.99);<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> final long[] percentiles = oldBins.getQuantiles(DEFAULT_QUANTILES);<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> final long count = oldBins.count.sum();<a name="line.316"></a> |
| <span class="sourceLineNo">317</span><a name="line.317"></a> |
| <span class="sourceLineNo">318</span> return new Snapshot() {<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> @Override<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> public long[] getQuantiles(double[] quantiles) {<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> return oldBins.getQuantiles(quantiles);<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> }<a name="line.322"></a> |
| <span class="sourceLineNo">323</span><a name="line.323"></a> |
| <span class="sourceLineNo">324</span> @Override<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> public long[] getQuantiles() {<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> return percentiles;<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> }<a name="line.327"></a> |
| <span class="sourceLineNo">328</span><a name="line.328"></a> |
| <span class="sourceLineNo">329</span> @Override<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> public long getCount() {<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> return count;<a name="line.331"></a> |
| <span class="sourceLineNo">332</span> }<a name="line.332"></a> |
| <span class="sourceLineNo">333</span><a name="line.333"></a> |
| <span class="sourceLineNo">334</span> @Override<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> public long getCountAtOrBelow(long val) {<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> return oldBins.getNumAtOrBelow(val);<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> }<a name="line.337"></a> |
| <span class="sourceLineNo">338</span><a name="line.338"></a> |
| <span class="sourceLineNo">339</span> @Override<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> public long get25thPercentile() {<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> return percentiles[0];<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> }<a name="line.342"></a> |
| <span class="sourceLineNo">343</span><a name="line.343"></a> |
| <span class="sourceLineNo">344</span> @Override<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> public long get75thPercentile() {<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> return percentiles[2];<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> }<a name="line.347"></a> |
| <span class="sourceLineNo">348</span><a name="line.348"></a> |
| <span class="sourceLineNo">349</span> @Override<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> public long get90thPercentile() {<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> return percentiles[3];<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> }<a name="line.352"></a> |
| <span class="sourceLineNo">353</span><a name="line.353"></a> |
| <span class="sourceLineNo">354</span> @Override<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> public long get95thPercentile() {<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> return percentiles[4];<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> }<a name="line.357"></a> |
| <span class="sourceLineNo">358</span><a name="line.358"></a> |
| <span class="sourceLineNo">359</span> @Override<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> public long get98thPercentile() {<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> return percentiles[5];<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> }<a name="line.362"></a> |
| <span class="sourceLineNo">363</span><a name="line.363"></a> |
| <span class="sourceLineNo">364</span> @Override<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> public long get99thPercentile() {<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> return percentiles[6];<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> }<a name="line.367"></a> |
| <span class="sourceLineNo">368</span><a name="line.368"></a> |
| <span class="sourceLineNo">369</span> @Override<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> public long get999thPercentile() {<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> return percentiles[7];<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> }<a name="line.372"></a> |
| <span class="sourceLineNo">373</span><a name="line.373"></a> |
| <span class="sourceLineNo">374</span> @Override<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> public long getMedian() {<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> return percentiles[1];<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> }<a name="line.377"></a> |
| <span class="sourceLineNo">378</span><a name="line.378"></a> |
| <span class="sourceLineNo">379</span> @Override<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> public long getMax() {<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> return oldBins.max.get();<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> }<a name="line.382"></a> |
| <span class="sourceLineNo">383</span><a name="line.383"></a> |
| <span class="sourceLineNo">384</span> @Override<a name="line.384"></a> |
| <span class="sourceLineNo">385</span> public long getMean() {<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> return oldBins.getMean();<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> }<a name="line.387"></a> |
| <span class="sourceLineNo">388</span><a name="line.388"></a> |
| <span class="sourceLineNo">389</span> @Override<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> public long getMin() {<a name="line.390"></a> |
| <span class="sourceLineNo">391</span> return oldBins.getMin();<a name="line.391"></a> |
| <span class="sourceLineNo">392</span> }<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> };<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> }<a name="line.394"></a> |
| <span class="sourceLineNo">395</span>}<a name="line.395"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
