http://git-wip-us.apache.org/repos/asf/hbase-site/blob/044b3379/apidocs/src-html/org/apache/hadoop/hbase/util/Counter.html ---------------------------------------------------------------------- diff --git a/apidocs/src-html/org/apache/hadoop/hbase/util/Counter.html b/apidocs/src-html/org/apache/hadoop/hbase/util/Counter.html index 01ae315..3cb1f0b 100644 --- a/apidocs/src-html/org/apache/hadoop/hbase/util/Counter.html +++ b/apidocs/src-html/org/apache/hadoop/hbase/util/Counter.html @@ -34,188 +34,190 @@ <span class="sourceLineNo">026</span><a name="line.26"></a> <span class="sourceLineNo">027</span>/**<a name="line.27"></a> <span class="sourceLineNo">028</span> * High scalable counter. Thread safe.<a name="line.28"></a> -<span class="sourceLineNo">029</span> */<a name="line.29"></a> -<span class="sourceLineNo">030</span>@InterfaceAudience.Public<a name="line.30"></a> -<span class="sourceLineNo">031</span>@InterfaceStability.Evolving<a name="line.31"></a> -<span class="sourceLineNo">032</span>public class Counter {<a name="line.32"></a> -<span class="sourceLineNo">033</span> private static final int MAX_CELLS_LENGTH = 1 << 20;<a name="line.33"></a> -<span class="sourceLineNo">034</span><a name="line.34"></a> -<span class="sourceLineNo">035</span> private static class Cell {<a name="line.35"></a> -<span class="sourceLineNo">036</span> // Pads are added around the value to avoid cache-line contention with<a name="line.36"></a> -<span class="sourceLineNo">037</span> // another cell's value. The cache-line size is expected to be equal to or<a name="line.37"></a> -<span class="sourceLineNo">038</span> // less than about 128 Bytes (= 64 Bits * 16).<a name="line.38"></a> -<span class="sourceLineNo">039</span><a name="line.39"></a> -<span class="sourceLineNo">040</span> @SuppressWarnings("unused")<a name="line.40"></a> -<span class="sourceLineNo">041</span> volatile long p0, p1, p2, p3, p4, p5, p6;<a name="line.41"></a> -<span class="sourceLineNo">042</span> volatile long value;<a name="line.42"></a> -<span class="sourceLineNo">043</span> @SuppressWarnings("unused")<a name="line.43"></a> -<span class="sourceLineNo">044</span> volatile long q0, q1, q2, q3, q4, q5, q6;<a name="line.44"></a> -<span class="sourceLineNo">045</span><a name="line.45"></a> -<span class="sourceLineNo">046</span> static final AtomicLongFieldUpdater<Cell> valueUpdater =<a name="line.46"></a> -<span class="sourceLineNo">047</span> AtomicLongFieldUpdater.newUpdater(Cell.class, "value");<a name="line.47"></a> -<span class="sourceLineNo">048</span><a name="line.48"></a> -<span class="sourceLineNo">049</span> Cell() {}<a name="line.49"></a> +<span class="sourceLineNo">029</span> * @deprecated use {@link java.util.concurrent.atomic.LongAdder} instead.<a name="line.29"></a> +<span class="sourceLineNo">030</span> */<a name="line.30"></a> +<span class="sourceLineNo">031</span>@InterfaceAudience.Public<a name="line.31"></a> +<span class="sourceLineNo">032</span>@InterfaceStability.Evolving<a name="line.32"></a> +<span class="sourceLineNo">033</span>@Deprecated<a name="line.33"></a> +<span class="sourceLineNo">034</span>public class Counter {<a name="line.34"></a> +<span class="sourceLineNo">035</span> private static final int MAX_CELLS_LENGTH = 1 << 20;<a name="line.35"></a> +<span class="sourceLineNo">036</span><a name="line.36"></a> +<span class="sourceLineNo">037</span> private static class Cell {<a name="line.37"></a> +<span class="sourceLineNo">038</span> // Pads are added around the value to avoid cache-line contention with<a name="line.38"></a> +<span class="sourceLineNo">039</span> // another cell's value. The cache-line size is expected to be equal to or<a name="line.39"></a> +<span class="sourceLineNo">040</span> // less than about 128 Bytes (= 64 Bits * 16).<a name="line.40"></a> +<span class="sourceLineNo">041</span><a name="line.41"></a> +<span class="sourceLineNo">042</span> @SuppressWarnings("unused")<a name="line.42"></a> +<span class="sourceLineNo">043</span> volatile long p0, p1, p2, p3, p4, p5, p6;<a name="line.43"></a> +<span class="sourceLineNo">044</span> volatile long value;<a name="line.44"></a> +<span class="sourceLineNo">045</span> @SuppressWarnings("unused")<a name="line.45"></a> +<span class="sourceLineNo">046</span> volatile long q0, q1, q2, q3, q4, q5, q6;<a name="line.46"></a> +<span class="sourceLineNo">047</span><a name="line.47"></a> +<span class="sourceLineNo">048</span> static final AtomicLongFieldUpdater<Cell> valueUpdater =<a name="line.48"></a> +<span class="sourceLineNo">049</span> AtomicLongFieldUpdater.newUpdater(Cell.class, "value");<a name="line.49"></a> <span class="sourceLineNo">050</span><a name="line.50"></a> -<span class="sourceLineNo">051</span> Cell(long initValue) {<a name="line.51"></a> -<span class="sourceLineNo">052</span> value = initValue;<a name="line.52"></a> -<span class="sourceLineNo">053</span> }<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span> long get() {<a name="line.55"></a> -<span class="sourceLineNo">056</span> return value;<a name="line.56"></a> -<span class="sourceLineNo">057</span> }<a name="line.57"></a> -<span class="sourceLineNo">058</span><a name="line.58"></a> -<span class="sourceLineNo">059</span> boolean add(long delta) {<a name="line.59"></a> -<span class="sourceLineNo">060</span> long current = value;<a name="line.60"></a> -<span class="sourceLineNo">061</span> return valueUpdater.compareAndSet(this, current, current + delta);<a name="line.61"></a> -<span class="sourceLineNo">062</span> }<a 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name="line.53"></a> +<span class="sourceLineNo">054</span> value = initValue;<a name="line.54"></a> +<span class="sourceLineNo">055</span> }<a name="line.55"></a> +<span class="sourceLineNo">056</span><a name="line.56"></a> +<span class="sourceLineNo">057</span> long get() {<a name="line.57"></a> +<span class="sourceLineNo">058</span> return value;<a name="line.58"></a> +<span class="sourceLineNo">059</span> }<a name="line.59"></a> +<span class="sourceLineNo">060</span><a name="line.60"></a> +<span class="sourceLineNo">061</span> boolean add(long delta) {<a name="line.61"></a> +<span class="sourceLineNo">062</span> long current = value;<a name="line.62"></a> +<span class="sourceLineNo">063</span> return valueUpdater.compareAndSet(this, current, current + delta);<a name="line.63"></a> +<span class="sourceLineNo">064</span> }<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> private static class Container {<a name="line.67"></a> +<span class="sourceLineNo">068</span> /** The length should be a power of 2. */<a name="line.68"></a> +<span class="sourceLineNo">069</span> final Cell[] cells;<a name="line.69"></a> +<span class="sourceLineNo">070</span><a name="line.70"></a> +<span class="sourceLineNo">071</span> /** True if a new extended container is going to replace this. */<a name="line.71"></a> +<span class="sourceLineNo">072</span> final AtomicBoolean demoted = new AtomicBoolean();<a name="line.72"></a> +<span class="sourceLineNo">073</span><a name="line.73"></a> +<span class="sourceLineNo">074</span> Container(Cell cell) {<a name="line.74"></a> +<span class="sourceLineNo">075</span> this(new Cell[] { cell });<a name="line.75"></a> +<span class="sourceLineNo">076</span> }<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> * @param cells the length should be a power of 2<a name="line.79"></a> +<span class="sourceLineNo">080</span> */<a name="line.80"></a> +<span class="sourceLineNo">081</span> Container(Cell[] cells) {<a name="line.81"></a> +<span class="sourceLineNo">082</span> this.cells = cells;<a name="line.82"></a> +<span class="sourceLineNo">083</span> }<a name="line.83"></a> +<span class="sourceLineNo">084</span> }<a name="line.84"></a> <span class="sourceLineNo">085</span><a name="line.85"></a> -<span class="sourceLineNo">086</span> public Counter() {<a name="line.86"></a> -<span class="sourceLineNo">087</span> this(new Cell());<a name="line.87"></a> -<span class="sourceLineNo">088</span> }<a name="line.88"></a> -<span class="sourceLineNo">089</span><a name="line.89"></a> -<span class="sourceLineNo">090</span> public Counter(long initValue) {<a name="line.90"></a> -<span class="sourceLineNo">091</span> this(new Cell(initValue));<a name="line.91"></a> -<span 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-<span class="sourceLineNo">103</span> // would be a good hash fcn, but actually on SunOS 5.8 it is pretty lousy<a name="line.103"></a> -<span class="sourceLineNo">104</span> // in the low bits.<a name="line.104"></a> -<span class="sourceLineNo">105</span><a name="line.105"></a> -<span class="sourceLineNo">106</span> h ^= (h >>> 20) ^ (h >>> 12); // Bit spreader, borrowed from Doug Lea<a name="line.106"></a> -<span class="sourceLineNo">107</span> h ^= (h >>> 7) ^ (h >>> 4);<a name="line.107"></a> -<span class="sourceLineNo">108</span> return h;<a name="line.108"></a> -<span class="sourceLineNo">109</span> }<a name="line.109"></a> -<span class="sourceLineNo">110</span><a name="line.110"></a> -<span class="sourceLineNo">111</span> private static class IndexHolder {<a name="line.111"></a> -<span class="sourceLineNo">112</span> int index = hash();<a name="line.112"></a> -<span class="sourceLineNo">113</span> }<a name="line.113"></a> -<span class="sourceLineNo">114</span><a name="line.114"></a> -<span class="sourceLineNo">115</span> private final ThreadLocal<IndexHolder> indexHolderThreadLocal =<a name="line.115"></a> -<span class="sourceLineNo">116</span> new ThreadLocal<IndexHolder>() {<a name="line.116"></a> -<span class="sourceLineNo">117</span> @Override<a name="line.117"></a> -<span class="sourceLineNo">118</span> protected IndexHolder initialValue() {<a name="line.118"></a> -<span class="sourceLineNo">119</span> return new IndexHolder();<a name="line.119"></a> -<span class="sourceLineNo">120</span> }<a name="line.120"></a> -<span class="sourceLineNo">121</span> };<a name="line.121"></a> -<span class="sourceLineNo">122</span><a name="line.122"></a> -<span class="sourceLineNo">123</span> public void add(long delta) {<a name="line.123"></a> -<span class="sourceLineNo">124</span> Container container = containerRef.get();<a name="line.124"></a> -<span class="sourceLineNo">125</span> Cell[] cells = container.cells;<a name="line.125"></a> -<span class="sourceLineNo">126</span> int mask = cells.length - 1;<a name="line.126"></a> -<span class="sourceLineNo">127</span><a name="line.127"></a> -<span class="sourceLineNo">128</span> IndexHolder indexHolder = indexHolderThreadLocal.get();<a name="line.128"></a> -<span class="sourceLineNo">129</span> int baseIndex = indexHolder.index;<a name="line.129"></a> -<span class="sourceLineNo">130</span> if(cells[baseIndex & mask].add(delta)) {<a name="line.130"></a> -<span class="sourceLineNo">131</span> return;<a name="line.131"></a> -<span class="sourceLineNo">132</span> }<a name="line.132"></a> -<span class="sourceLineNo">133</span><a name="line.133"></a> -<span class="sourceLineNo">134</span> int index = baseIndex + 1;<a name="line.134"></a> -<span class="sourceLineNo">135</span> while(true) {<a name="line.135"></a> -<span class="sourceLineNo">136</span> if(cells[index & mask].add(delta)) {<a name="line.136"></a> -<span class="sourceLineNo">137</span> break;<a name="line.137"></a> -<span class="sourceLineNo">138</span> }<a name="line.138"></a> -<span class="sourceLineNo">139</span> index++;<a name="line.139"></a> -<span class="sourceLineNo">140</span> }<a name="line.140"></a> -<span class="sourceLineNo">141</span><a name="line.141"></a> -<span class="sourceLineNo">142</span> indexHolder.index = index;<a name="line.142"></a> +<span class="sourceLineNo">086</span> private final AtomicReference<Container> containerRef;<a name="line.86"></a> +<span class="sourceLineNo">087</span><a name="line.87"></a> +<span class="sourceLineNo">088</span> public Counter() {<a name="line.88"></a> +<span class="sourceLineNo">089</span> this(new Cell());<a name="line.89"></a> +<span class="sourceLineNo">090</span> }<a name="line.90"></a> +<span class="sourceLineNo">091</span><a name="line.91"></a> +<span class="sourceLineNo">092</span> public Counter(long initValue) {<a name="line.92"></a> +<span class="sourceLineNo">093</span> this(new Cell(initValue));<a name="line.93"></a> +<span 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class="sourceLineNo">128</span> int mask = cells.length - 1;<a name="line.128"></a> +<span class="sourceLineNo">129</span><a name="line.129"></a> +<span class="sourceLineNo">130</span> IndexHolder indexHolder = indexHolderThreadLocal.get();<a name="line.130"></a> +<span class="sourceLineNo">131</span> int baseIndex = indexHolder.index;<a name="line.131"></a> +<span class="sourceLineNo">132</span> if(cells[baseIndex & mask].add(delta)) {<a name="line.132"></a> +<span class="sourceLineNo">133</span> return;<a name="line.133"></a> +<span class="sourceLineNo">134</span> }<a name="line.134"></a> +<span class="sourceLineNo">135</span><a name="line.135"></a> +<span class="sourceLineNo">136</span> int index = baseIndex + 1;<a name="line.136"></a> +<span class="sourceLineNo">137</span> while(true) {<a name="line.137"></a> +<span class="sourceLineNo">138</span> if(cells[index & mask].add(delta)) {<a name="line.138"></a> +<span class="sourceLineNo">139</span> break;<a name="line.139"></a> +<span 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http://git-wip-us.apache.org/repos/asf/hbase-site/blob/044b3379/apidocs/src-html/org/apache/hadoop/hbase/util/FastLongHistogram.html ---------------------------------------------------------------------- diff --git a/apidocs/src-html/org/apache/hadoop/hbase/util/FastLongHistogram.html b/apidocs/src-html/org/apache/hadoop/hbase/util/FastLongHistogram.html index c9ecead..7778113 100644 --- a/apidocs/src-html/org/apache/hadoop/hbase/util/FastLongHistogram.html +++ b/apidocs/src-html/org/apache/hadoop/hbase/util/FastLongHistogram.html @@ -25,305 +25,297 @@ <span class="sourceLineNo">017</span> */<a name="line.17"></a> <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.util;<a name="line.18"></a> <span class="sourceLineNo">019</span><a name="line.19"></a> -<span class="sourceLineNo">020</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.20"></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><a name="line.22"></a> -<span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.24"></a> -<span class="sourceLineNo">025</span><a name="line.25"></a> -<span class="sourceLineNo">026</span>/**<a name="line.26"></a> -<span class="sourceLineNo">027</span> * FastLongHistogram is a thread-safe class that estimate distribution of data and computes the<a name="line.27"></a> -<span class="sourceLineNo">028</span> * quantiles.<a name="line.28"></a> -<span class="sourceLineNo">029</span> */<a name="line.29"></a> -<span class="sourceLineNo">030</span>@InterfaceAudience.Public<a name="line.30"></a> -<span class="sourceLineNo">031</span>@InterfaceStability.Evolving<a name="line.31"></a> -<span class="sourceLineNo">032</span>public class FastLongHistogram {<a name="line.32"></a> -<span class="sourceLineNo">033</span><a name="line.33"></a> -<span class="sourceLineNo">034</span> /**<a name="line.34"></a> -<span class="sourceLineNo">035</span> * Default number of bins.<a name="line.35"></a> -<span class="sourceLineNo">036</span> */<a name="line.36"></a> -<span class="sourceLineNo">037</span> public static final int DEFAULT_NBINS = 255;<a name="line.37"></a> -<span class="sourceLineNo">038</span><a name="line.38"></a> -<span class="sourceLineNo">039</span> public static final double[] DEFAULT_QUANTILES =<a name="line.39"></a> -<span class="sourceLineNo">040</span> new double[]{0.25, 0.5, 0.75, 0.90, 0.95, 0.98, 0.99, 0.999};<a name="line.40"></a> -<span class="sourceLineNo">041</span><a name="line.41"></a> -<span class="sourceLineNo">042</span> /**<a name="line.42"></a> -<span class="sourceLineNo">043</span> * Bins is a class containing a list of buckets(or bins) for estimation histogram of some data.<a name="line.43"></a> -<span class="sourceLineNo">044</span> */<a name="line.44"></a> -<span class="sourceLineNo">045</span> private static class Bins {<a name="line.45"></a> -<span class="sourceLineNo">046</span> private final Counter[] counts;<a name="line.46"></a> -<span class="sourceLineNo">047</span> // inclusive<a name="line.47"></a> -<span class="sourceLineNo">048</span> private final long binsMin;<a name="line.48"></a> -<span class="sourceLineNo">049</span> // exclusive<a name="line.49"></a> -<span class="sourceLineNo">050</span> private final long binsMax;<a name="line.50"></a> -<span class="sourceLineNo">051</span> private final long bins10XMax;<a name="line.51"></a> -<span class="sourceLineNo">052</span> private final AtomicLong min = new AtomicLong(Long.MAX_VALUE);<a name="line.52"></a> -<span class="sourceLineNo">053</span> private final AtomicLong max = new AtomicLong(0L);<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span> private final Counter count = new Counter(0);<a name="line.55"></a> -<span class="sourceLineNo">056</span> private final Counter total = new Counter(0);<a name="line.56"></a> -<span class="sourceLineNo">057</span><a name="line.57"></a> -<span class="sourceLineNo">058</span> // set to true when any of data has been inserted to the Bins. It is set after the counts are<a name="line.58"></a> -<span class="sourceLineNo">059</span> // updated.<a name="line.59"></a> -<span class="sourceLineNo">060</span> private final AtomicBoolean hasData = new AtomicBoolean(false);<a name="line.60"></a> -<span class="sourceLineNo">061</span><a name="line.61"></a> -<span class="sourceLineNo">062</span> /**<a name="line.62"></a> -<span class="sourceLineNo">063</span> * The constructor for creating a Bins without any prior data.<a name="line.63"></a> -<span class="sourceLineNo">064</span> */<a name="line.64"></a> -<span class="sourceLineNo">065</span> public Bins(int numBins) {<a name="line.65"></a> -<span class="sourceLineNo">066</span> counts = createCounters(numBins + 3);<a name="line.66"></a> -<span class="sourceLineNo">067</span> this.binsMin = 1L;<a name="line.67"></a> -<span class="sourceLineNo">068</span><a name="line.68"></a> -<span class="sourceLineNo">069</span> // These two numbers are total guesses<a name="line.69"></a> -<span class="sourceLineNo">070</span> // and should be treated as highly suspect.<a name="line.70"></a> -<span class="sourceLineNo">071</span> this.binsMax = 1000;<a name="line.71"></a> -<span class="sourceLineNo">072</span> this.bins10XMax = binsMax * 10;<a name="line.72"></a> -<span class="sourceLineNo">073</span> }<a name="line.73"></a> -<span class="sourceLineNo">074</span><a name="line.74"></a> -<span class="sourceLineNo">075</span> /**<a name="line.75"></a> -<span class="sourceLineNo">076</span> * The constructor for creating a Bins with last Bins.<a name="line.76"></a> -<span class="sourceLineNo">077</span> */<a name="line.77"></a> -<span class="sourceLineNo">078</span> public Bins(Bins last, int numOfBins, double minQ, double maxQ) {<a name="line.78"></a> -<span class="sourceLineNo">079</span> long[] values = last.getQuantiles(new double[] { minQ, maxQ });<a name="line.79"></a> -<span class="sourceLineNo">080</span> long wd = values[1] - values[0] + 1;<a name="line.80"></a> -<span class="sourceLineNo">081</span> // expand minQ and maxQ in two ends back assuming uniform distribution<a name="line.81"></a> -<span class="sourceLineNo">082</span> this.binsMin = Math.max(0L, (long) (values[0] - wd * minQ));<a name="line.82"></a> -<span class="sourceLineNo">083</span> long binsMax = (long) (values[1] + wd * (1 - maxQ)) + 1;<a name="line.83"></a> -<span class="sourceLineNo">084</span> // make sure each of bins is at least of width 1<a name="line.84"></a> -<span class="sourceLineNo">085</span> this.binsMax = Math.max(binsMax, this.binsMin + numOfBins);<a name="line.85"></a> -<span class="sourceLineNo">086</span> this.bins10XMax = Math.max((long) (values[1] + (binsMax - 1) * 9), this.binsMax + 1);<a name="line.86"></a> -<span class="sourceLineNo">087</span><a name="line.87"></a> -<span class="sourceLineNo">088</span> this.counts = createCounters(numOfBins + 3);<a name="line.88"></a> -<span class="sourceLineNo">089</span> }<a name="line.89"></a> -<span class="sourceLineNo">090</span><a name="line.90"></a> -<span class="sourceLineNo">091</span> private Counter[] createCounters(int num) {<a name="line.91"></a> -<span class="sourceLineNo">092</span> Counter[] counters = new Counter[num];<a name="line.92"></a> -<span class="sourceLineNo">093</span> for (int i = 0; i < num; i++) {<a name="line.93"></a> -<span class="sourceLineNo">094</span> counters[i] = new Counter();<a name="line.94"></a> -<span class="sourceLineNo">095</span> }<a name="line.95"></a> -<span class="sourceLineNo">096</span> return counters;<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 + (int) ((value - this.binsMin) * (this.counts.length - 3) /<a name="line.108"></a> -<span class="sourceLineNo">109</span> (this.binsMax - this.binsMin));<a name="line.109"></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><a name="line.24"></a> +<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.26"></a> +<span class="sourceLineNo">027</span><a name="line.27"></a> +<span class="sourceLineNo">028</span>/**<a name="line.28"></a> +<span class="sourceLineNo">029</span> * FastLongHistogram is a thread-safe class that estimate distribution of data and computes the<a name="line.29"></a> +<span class="sourceLineNo">030</span> * quantiles.<a name="line.30"></a> +<span class="sourceLineNo">031</span> */<a name="line.31"></a> +<span class="sourceLineNo">032</span>@InterfaceAudience.Public<a name="line.32"></a> +<span class="sourceLineNo">033</span>@InterfaceStability.Evolving<a name="line.33"></a> +<span class="sourceLineNo">034</span>public class FastLongHistogram {<a name="line.34"></a> +<span class="sourceLineNo">035</span><a name="line.35"></a> +<span class="sourceLineNo">036</span> /**<a name="line.36"></a> +<span class="sourceLineNo">037</span> * Default number of bins.<a name="line.37"></a> +<span class="sourceLineNo">038</span> */<a name="line.38"></a> +<span class="sourceLineNo">039</span> public static final int DEFAULT_NBINS = 255;<a name="line.39"></a> +<span class="sourceLineNo">040</span><a name="line.40"></a> +<span class="sourceLineNo">041</span> public static final double[] DEFAULT_QUANTILES =<a name="line.41"></a> +<span class="sourceLineNo">042</span> new double[]{0.25, 0.5, 0.75, 0.90, 0.95, 0.98, 0.99, 0.999};<a name="line.42"></a> +<span class="sourceLineNo">043</span><a name="line.43"></a> +<span class="sourceLineNo">044</span> /**<a name="line.44"></a> +<span class="sourceLineNo">045</span> * Bins is a class containing a list of buckets(or bins) for estimation histogram of some data.<a name="line.45"></a> +<span class="sourceLineNo">046</span> */<a name="line.46"></a> +<span class="sourceLineNo">047</span> private static class Bins {<a name="line.47"></a> +<span class="sourceLineNo">048</span> private final LongAdder[] counts;<a name="line.48"></a> +<span class="sourceLineNo">049</span> // inclusive<a name="line.49"></a> +<span class="sourceLineNo">050</span> private final long binsMin;<a name="line.50"></a> +<span class="sourceLineNo">051</span> // exclusive<a name="line.51"></a> +<span class="sourceLineNo">052</span> private final long binsMax;<a name="line.52"></a> +<span class="sourceLineNo">053</span> private final long bins10XMax;<a name="line.53"></a> +<span class="sourceLineNo">054</span> private final AtomicLong min = new AtomicLong(Long.MAX_VALUE);<a name="line.54"></a> +<span class="sourceLineNo">055</span> private final AtomicLong max = new AtomicLong(0L);<a name="line.55"></a> +<span class="sourceLineNo">056</span><a name="line.56"></a> +<span class="sourceLineNo">057</span> private final LongAdder count = new LongAdder();<a name="line.57"></a> +<span class="sourceLineNo">058</span> private final LongAdder total = new LongAdder();<a name="line.58"></a> +<span class="sourceLineNo">059</span><a name="line.59"></a> +<span class="sourceLineNo">060</span> // set to true when any of data has been inserted to the Bins. It is set after the counts are<a name="line.60"></a> +<span class="sourceLineNo">061</span> // updated.<a name="line.61"></a> +<span class="sourceLineNo">062</span> private volatile boolean hasData = false;<a name="line.62"></a> +<span class="sourceLineNo">063</span><a name="line.63"></a> +<span class="sourceLineNo">064</span> /**<a name="line.64"></a> +<span class="sourceLineNo">065</span> * The constructor for creating a Bins without any prior data.<a name="line.65"></a> +<span class="sourceLineNo">066</span> */<a name="line.66"></a> +<span class="sourceLineNo">067</span> public Bins(int numBins) {<a name="line.67"></a> +<span class="sourceLineNo">068</span> counts = createCounters(numBins);<a name="line.68"></a> +<span class="sourceLineNo">069</span> this.binsMin = 1L;<a name="line.69"></a> +<span class="sourceLineNo">070</span><a name="line.70"></a> +<span class="sourceLineNo">071</span> // These two numbers are total guesses<a name="line.71"></a> +<span class="sourceLineNo">072</span> // and should be treated as highly suspect.<a name="line.72"></a> +<span class="sourceLineNo">073</span> this.binsMax = 1000;<a name="line.73"></a> +<span class="sourceLineNo">074</span> this.bins10XMax = binsMax * 10;<a name="line.74"></a> +<span class="sourceLineNo">075</span> }<a name="line.75"></a> +<span class="sourceLineNo">076</span><a name="line.76"></a> +<span class="sourceLineNo">077</span> /**<a name="line.77"></a> +<span class="sourceLineNo">078</span> * The constructor for creating a Bins with last Bins.<a name="line.78"></a> +<span class="sourceLineNo">079</span> */<a name="line.79"></a> +<span class="sourceLineNo">080</span> public Bins(Bins last, int numBins, double minQ, double maxQ) {<a name="line.80"></a> +<span class="sourceLineNo">081</span> long[] values = last.getQuantiles(new double[] { minQ, maxQ });<a name="line.81"></a> +<span class="sourceLineNo">082</span> long wd = values[1] - values[0] + 1;<a name="line.82"></a> +<span class="sourceLineNo">083</span> // expand minQ and maxQ in two ends back assuming uniform distribution<a name="line.83"></a> +<span class="sourceLineNo">084</span> this.binsMin = Math.max(0L, (long) (values[0] - wd * minQ));<a name="line.84"></a> +<span class="sourceLineNo">085</span> long binsMax = (long) (values[1] + wd * (1 - maxQ)) + 1;<a name="line.85"></a> +<span class="sourceLineNo">086</span> // make sure each of bins is at least of width 1<a name="line.86"></a> +<span class="sourceLineNo">087</span> this.binsMax = Math.max(binsMax, this.binsMin + numBins);<a name="line.87"></a> +<span class="sourceLineNo">088</span> this.bins10XMax = Math.max((long) (values[1] + (binsMax - 1) * 9), this.binsMax + 1);<a name="line.88"></a> +<span class="sourceLineNo">089</span><a name="line.89"></a> +<span class="sourceLineNo">090</span> this.counts = createCounters(numBins);<a name="line.90"></a> +<span class="sourceLineNo">091</span> }<a name="line.91"></a> +<span class="sourceLineNo">092</span><a name="line.92"></a> +<span class="sourceLineNo">093</span> private LongAdder[] createCounters(int numBins) {<a name="line.93"></a> +<span class="sourceLineNo">094</span> return Stream.generate(LongAdder::new).limit(numBins + 3).toArray(LongAdder[]::new);<a name="line.94"></a> +<span class="sourceLineNo">095</span> }<a name="line.95"></a> +<span class="sourceLineNo">096</span><a name="line.96"></a> +<span class="sourceLineNo">097</span> private int getIndex(long value) {<a name="line.97"></a> +<span class="sourceLineNo">098</span> if (value < this.binsMin) {<a name="line.98"></a> +<span class="sourceLineNo">099</span> return 0;<a name="line.99"></a> +<span class="sourceLineNo">100</span> } else if (value > this.bins10XMax) {<a name="line.100"></a> +<span class="sourceLineNo">101</span> return this.counts.length - 1;<a name="line.101"></a> +<span class="sourceLineNo">102</span> } else if (value >= this.binsMax) {<a name="line.102"></a> +<span class="sourceLineNo">103</span> return this.counts.length - 2;<a name="line.103"></a> +<span class="sourceLineNo">104</span> }<a name="line.104"></a> +<span class="sourceLineNo">105</span> // compute the position<a name="line.105"></a> +<span class="sourceLineNo">106</span> return 1 + (int) ((value - this.binsMin) * (this.counts.length - 3) /<a name="line.106"></a> +<span class="sourceLineNo">107</span> (this.binsMax - this.binsMin));<a name="line.107"></a> +<span class="sourceLineNo">108</span><a name="line.108"></a> +<span class="sourceLineNo">109</span> }<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.set(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> public long[] getQuantiles(double[] quantiles) {<a name="line.141"></a> -<span class="sourceLineNo">142</span> if (!this.hasData.get()) {<a name="line.142"></a> -<span class="sourceLineNo">143</span> // No data yet.<a name="line.143"></a> -<span class="sourceLineNo">144</span> return new long[quantiles.length];<a name="line.144"></a> -<span class="sourceLineNo">145</span> }<a name="line.145"></a> -<span class="sourceLineNo">146</span><a name="line.146"></a> -<span class="sourceLineNo">147</span> // Make a snapshot of lowerCounter, higherCounter and bins.counts to counts.<a name="line.147"></a> -<span class="sourceLineNo">148</span> // This is not synchronized, but since the counter are accumulating, the result is a good<a name="line.148"></a> -<span class="sourceLineNo">149</span> // estimation of a snapshot.<a name="line.149"></a> -<span class="sourceLineNo">150</span> long[] counts = new long[this.counts.length];<a name="line.150"></a> -<span class="sourceLineNo">151</span> long total = 0L;<a name="line.151"></a> -<span class="sourceLineNo">152</span> for (int i = 0; i < this.counts.length; i++) {<a name="line.152"></a> -<span class="sourceLineNo">153</span> counts[i] = this.counts[i].get();<a name="line.153"></a> -<span class="sourceLineNo">154</span> total += counts[i];<a name="line.154"></a> -<span class="sourceLineNo">155</span> }<a name="line.155"></a> -<span class="sourceLineNo">156</span><a name="line.156"></a> -<span class="sourceLineNo">157</span> int rIndex = 0;<a name="line.157"></a> -<span class="sourceLineNo">158</span> double qCount = total * quantiles[0];<a name="line.158"></a> -<span class="sourceLineNo">159</span> long cum = 0L;<a name="line.159"></a> -<span class="sourceLineNo">160</span><a name="line.160"></a> 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It is replaced with a new one in calling of reset().<a name="line.227"></a> -<span class="sourceLineNo">228</span> private volatile Bins bins;<a name="line.228"></a> -<span class="sourceLineNo">229</span><a name="line.229"></a> -<span class="sourceLineNo">230</span> /**<a name="line.230"></a> -<span class="sourceLineNo">231</span> * Constructor.<a name="line.231"></a> -<span class="sourceLineNo">232</span> */<a name="line.232"></a> -<span class="sourceLineNo">233</span> public FastLongHistogram() {<a name="line.233"></a> -<span class="sourceLineNo">234</span> this(DEFAULT_NBINS);<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> /**<a name="line.237"></a> -<span class="sourceLineNo">238</span> * Constructor.<a name="line.238"></a> -<span class="sourceLineNo">239</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.239"></a> -<span class="sourceLineNo">240</span> * results but with lower efficiency, and vice versus.<a name="line.240"></a> -<span class="sourceLineNo">241</span> */<a name="line.241"></a> -<span class="sourceLineNo">242</span> public FastLongHistogram(int numOfBins) {<a name="line.242"></a> -<span class="sourceLineNo">243</span> this.bins = new Bins(numOfBins);<a name="line.243"></a> -<span class="sourceLineNo">244</span> }<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> * Constructor setting the bins assuming a uniform distribution within a range.<a name="line.247"></a> -<span class="sourceLineNo">248</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.248"></a> -<span class="sourceLineNo">249</span> * results but with lower efficiency, and vice versus.<a name="line.249"></a> -<span class="sourceLineNo">250</span> * @param min lower bound of the region, inclusive.<a name="line.250"></a> -<span class="sourceLineNo">251</span> * @param max higher bound of the region, inclusive.<a name="line.251"></a> -<span class="sourceLineNo">252</span> */<a name="line.252"></a> -<span class="sourceLineNo">253</span> public FastLongHistogram(int numOfBins, long min, long max) {<a name="line.253"></a> -<span class="sourceLineNo">254</span> this(numOfBins);<a name="line.254"></a> -<span class="sourceLineNo">255</span> Bins bins = new Bins(numOfBins);<a name="line.255"></a> -<span class="sourceLineNo">256</span> bins.add(min, 1);<a name="line.256"></a> -<span class="sourceLineNo">257</span> bins.add(max, 1);<a name="line.257"></a> -<span class="sourceLineNo">258</span> this.bins = new Bins(bins, numOfBins, 0.01, 0.999);<a name="line.258"></a> -<span class="sourceLineNo">259</span> }<a name="line.259"></a> -<span class="sourceLineNo">260</span><a name="line.260"></a> -<span class="sourceLineNo">261</span> private FastLongHistogram(Bins bins) {<a name="line.261"></a> -<span class="sourceLineNo">262</span> this.bins = bins;<a name="line.262"></a> -<span class="sourceLineNo">263</span> }<a name="line.263"></a> -<span class="sourceLineNo">264</span><a name="line.264"></a> -<span class="sourceLineNo">265</span> /**<a name="line.265"></a> -<span class="sourceLineNo">266</span> * Adds a value to the histogram.<a name="line.266"></a> -<span class="sourceLineNo">267</span> */<a name="line.267"></a> -<span class="sourceLineNo">268</span> public void add(long value, long count) {<a name="line.268"></a> -<span class="sourceLineNo">269</span> this.bins.add(value, count);<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> /**<a name="line.272"></a> -<span class="sourceLineNo">273</span> * Computes the quantiles give the ratios.<a name="line.273"></a> -<span class="sourceLineNo">274</span> */<a name="line.274"></a> -<span class="sourceLineNo">275</span> public long[] getQuantiles(double[] quantiles) {<a name="line.275"></a> -<span class="sourceLineNo">276</span> return this.bins.getQuantiles(quantiles);<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> public long[] getQuantiles() {<a name="line.279"></a> -<span class="sourceLineNo">280</span> return this.bins.getQuantiles(DEFAULT_QUANTILES);<a name="line.280"></a> -<span class="sourceLineNo">281</span> }<a name="line.281"></a> -<span class="sourceLineNo">282</span><a name="line.282"></a> -<span class="sourceLineNo">283</span> public long getMin() {<a name="line.283"></a> -<span class="sourceLineNo">284</span> long min = this.bins.min.get();<a name="line.284"></a> -<span class="sourceLineNo">285</span> return min == Long.MAX_VALUE ? 0 : min; // in case it is not initialized<a name="line.285"></a> +<span class="sourceLineNo">111</span> /**<a name="line.111"></a> +<span class="sourceLineNo">112</span> * Adds a value to the histogram.<a name="line.112"></a> +<span class="sourceLineNo">113</span> */<a name="line.113"></a> +<span class="sourceLineNo">114</span> public void add(long value, long count) {<a name="line.114"></a> +<span class="sourceLineNo">115</span> if (value < 0) {<a name="line.115"></a> +<span class="sourceLineNo">116</span> // The whole computation is completely thrown off if there are negative numbers<a name="line.116"></a> +<span class="sourceLineNo">117</span> //<a name="line.117"></a> +<span class="sourceLineNo">118</span> // Normally we would throw an IllegalArgumentException however this is the metrics<a name="line.118"></a> +<span class="sourceLineNo">119</span> // system and it should be completely safe at all times.<a name="line.119"></a> +<span class="sourceLineNo">120</span> // So silently throw it away.<a name="line.120"></a> +<span class="sourceLineNo">121</span> return;<a name="line.121"></a> +<span class="sourceLineNo">122</span> }<a name="line.122"></a> +<span class="sourceLineNo">123</span> AtomicUtils.updateMin(min, value);<a name="line.123"></a> +<span class="sourceLineNo">124</span> AtomicUtils.updateMax(max, value);<a name="line.124"></a> +<span class="sourceLineNo">125</span><a name="line.125"></a> +<span class="sourceLineNo">126</span> this.count.add(count);<a name="line.126"></a> +<span class="sourceLineNo">127</span> this.total.add(value * count);<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> int pos = getIndex(value);<a name="line.129"></a> +<span class="sourceLineNo">130</span> this.counts[pos].add(count);<a name="line.130"></a> +<span class="sourceLineNo">131</span><a name="line.131"></a> +<span class="sourceLineNo">132</span> // hasData needs to be updated as last<a name="line.132"></a> +<span class="sourceLineNo">133</span> this.hasData = true;<a name="line.133"></a> +<span class="sourceLineNo">134</span> }<a name="line.134"></a> +<span class="sourceLineNo">135</span><a name="line.135"></a> +<span class="sourceLineNo">136</span> /**<a name="line.136"></a> +<span class="sourceLineNo">137</span> * Computes the quantiles give the ratios.<a name="line.137"></a> +<span class="sourceLineNo">138</span> */<a name="line.138"></a> +<span class="sourceLineNo">139</span> public long[] getQuantiles(double[] quantiles) {<a name="line.139"></a> +<span class="sourceLineNo">140</span> if (!hasData) {<a name="line.140"></a> +<span class="sourceLineNo">141</span> // No data yet.<a name="line.141"></a> +<span class="sourceLineNo">142</span> return new long[quantiles.length];<a name="line.142"></a> +<span class="sourceLineNo">143</span> }<a name="line.143"></a> +<span class="sourceLineNo">144</span><a name="line.144"></a> +<span class="sourceLineNo">145</span> // Make a snapshot of lowerCounter, higherCounter and bins.counts to counts.<a name="line.145"></a> +<span class="sourceLineNo">146</span> // This is not synchronized, but since the counter are accumulating, the result is a good<a name="line.146"></a> +<span class="sourceLineNo">147</span> // estimation of a snapshot.<a name="line.147"></a> +<span class="sourceLineNo">148</span> long[] counts = new long[this.counts.length];<a name="line.148"></a> +<span class="sourceLineNo">149</span> long total = 0L;<a name="line.149"></a> +<span class="sourceLineNo">150</span> for (int i = 0; i < this.counts.length; i++) {<a name="line.150"></a> +<span class="sourceLineNo">151</span> counts[i] = this.counts[i].sum();<a name="line.151"></a> +<span class="sourceLineNo">152</span> total += counts[i];<a name="line.152"></a> +<span class="sourceLineNo">153</span> }<a name="line.153"></a> +<span class="sourceLineNo">154</span><a name="line.154"></a> +<span class="sourceLineNo">155</span> int rIndex = 0;<a name="line.155"></a> +<span class="sourceLineNo">156</span> double qCount = total * quantiles[0];<a name="line.156"></a> +<span class="sourceLineNo">157</span> long cum = 0L;<a name="line.157"></a> +<span class="sourceLineNo">158</span><a name="line.158"></a> +<span class="sourceLineNo">159</span> long[] res = new long[quantiles.length];<a name="line.159"></a> +<span class="sourceLineNo">160</span> countsLoop: for (int i = 0; i < counts.length; i++) {<a name="line.160"></a> +<span class="sourceLineNo">161</span> // mn and mx define a value range<a name="line.161"></a> +<span class="sourceLineNo">162</span> long mn, mx;<a name="line.162"></a> +<span class="sourceLineNo">163</span> if (i == 0) {<a name="line.163"></a> +<span class="sourceLineNo">164</span> mn = this.min.get();<a name="line.164"></a> +<span class="sourceLineNo">165</span> mx = this.binsMin;<a name="line.165"></a> +<span class="sourceLineNo">166</span> } else if (i == counts.length - 1) {<a name="line.166"></a> +<span class="sourceLineNo">167</span> mn = this.bins10XMax;<a name="line.167"></a> +<span class="sourceLineNo">168</span> mx = this.max.get();<a name="line.168"></a> +<span class="sourceLineNo">169</span> } else if (i == counts.length - 2) {<a name="line.169"></a> +<span class="sourceLineNo">170</span> mn = this.binsMax;<a name="line.170"></a> +<span class="sourceLineNo">171</span> mx = this.bins10XMax;<a name="line.171"></a> +<span class="sourceLineNo">172</span> } else {<a name="line.172"></a> +<span class="sourceLineNo">173</span> mn = this.binsMin + (i - 1) * (this.binsMax - this.binsMin) / (this.counts.length - 3);<a name="line.173"></a> +<span class="sourceLineNo">174</span> mx = this.binsMin + i * (this.binsMax - this.binsMin) / (this.counts.length - 3);<a name="line.174"></a> +<span class="sourceLineNo">175</span> }<a name="line.175"></a> +<span class="sourceLineNo">176</span><a name="line.176"></a> +<span class="sourceLineNo">177</span> if (mx < this.min.get()) {<a name="line.177"></a> +<span class="sourceLineNo">178</span> continue;<a name="line.178"></a> +<span class="sourceLineNo">179</span> }<a name="line.179"></a> +<span class="sourceLineNo">180</span> if (mn > this.max.get()) {<a name="line.180"></a> +<span class="sourceLineNo">181</span> break;<a name="line.181"></a> +<span class="sourceLineNo">182</span> }<a name="line.182"></a> +<span class="sourceLineNo">183</span> mn = Math.max(mn, this.min.get());<a name="line.183"></a> +<span class="sourceLineNo">184</span> mx = Math.min(mx, this.max.get());<a name="line.184"></a> +<span class="sourceLineNo">185</span><a name="line.185"></a> +<span class="sourceLineNo">186</span> // lastCum/cum are the corresponding counts to mn/mx<a name="line.186"></a> +<span class="sourceLineNo">187</span> double lastCum = cum;<a name="line.187"></a> +<span class="sourceLineNo">188</span> cum += counts[i];<a name="line.188"></a> +<span class="sourceLineNo">189</span><a name="line.189"></a> +<span class="sourceLineNo">190</span> // fill the results for qCount is within current range.<a name="line.190"></a> +<span class="sourceLineNo">191</span> while (qCount <= cum) {<a name="line.191"></a> +<span class="sourceLineNo">192</span> if (cum == lastCum) {<a name="line.192"></a> +<span class="sourceLineNo">193</span> res[rIndex] = mn;<a name="line.193"></a> +<span class="sourceLineNo">194</span> } else {<a name="line.194"></a> +<span class="sourceLineNo">195</span> res[rIndex] = (long) ((qCount - lastCum) * (mx - mn) / (cum - lastCum) + mn);<a name="line.195"></a> +<span class="sourceLineNo">196</span> }<a name="line.196"></a> +<span class="sourceLineNo">197</span><a name="line.197"></a> +<span class="sourceLineNo">198</span> // move to next quantile<a name="line.198"></a> +<span class="sourceLineNo">199</span> rIndex++;<a name="line.199"></a> +<span class="sourceLineNo">200</span> if (rIndex >= quantiles.length) {<a name="line.200"></a> +<span class="sourceLineNo">201</span> break countsLoop;<a name="line.201"></a> +<span class="sourceLineNo">202</span> }<a name="line.202"></a> +<span class="sourceLineNo">203</span> qCount = total * quantiles[rIndex];<a name="line.203"></a> +<span class="sourceLineNo">204</span> }<a name="line.204"></a> +<span class="sourceLineNo">205</span> }<a name="line.205"></a> +<span class="sourceLineNo">206</span> // In case quantiles contains values >= 100%<a name="line.206"></a> +<span class="sourceLineNo">207</span> for (; rIndex < quantiles.length; rIndex++) {<a name="line.207"></a> +<span class="sourceLineNo">208</span> res[rIndex] = this.max.get();<a name="line.208"></a> +<span class="sourceLineNo">209</span> }<a name="line.209"></a> +<span class="sourceLineNo">210</span><a name="line.210"></a> +<span class="sourceLineNo">211</span> return res;<a name="line.211"></a> +<span class="sourceLineNo">212</span> }<a name="line.212"></a> +<span class="sourceLineNo">213</span><a name="line.213"></a> +<span class="sourceLineNo">214</span> long getNumAtOrBelow(long val) {<a name="line.214"></a> +<span class="sourceLineNo">215</span> return Arrays.stream(counts).mapToLong(c -> c.sum()).limit(getIndex(val) + 1).sum();<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><a name="line.218"></a> +<span class="sourceLineNo">219</span> // The bins counting values. It is replaced with a new one in calling of reset().<a name="line.219"></a> +<span class="sourceLineNo">220</span> private volatile Bins bins;<a name="line.220"></a> +<span class="sourceLineNo">221</span><a name="line.221"></a> +<span class="sourceLineNo">222</span> /**<a name="line.222"></a> +<span class="sourceLineNo">223</span> * Constructor.<a name="line.223"></a> +<span class="sourceLineNo">224</span> */<a name="line.224"></a> +<span class="sourceLineNo">225</span> public FastLongHistogram() {<a name="line.225"></a> +<span class="sourceLineNo">226</span> this(DEFAULT_NBINS);<a name="line.226"></a> +<span class="sourceLineNo">227</span> }<a name="line.227"></a> +<span class="sourceLineNo">228</span><a name="line.228"></a> +<span class="sourceLineNo">229</span> /**<a name="line.229"></a> +<span class="sourceLineNo">230</span> * Constructor.<a name="line.230"></a> +<span class="sourceLineNo">231</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.231"></a> +<span class="sourceLineNo">232</span> * results but with lower efficiency, and vice versus.<a name="line.232"></a> +<span class="sourceLineNo">233</span> */<a name="line.233"></a> +<span class="sourceLineNo">234</span> public FastLongHistogram(int numOfBins) {<a name="line.234"></a> +<span class="sourceLineNo">235</span> this.bins = new Bins(numOfBins);<a name="line.235"></a> +<span class="sourceLineNo">236</span> }<a name="line.236"></a> +<span class="sourceLineNo">237</span><a name="line.237"></a> +<span class="sourceLineNo">238</span> /**<a name="line.238"></a> +<span class="sourceLineNo">239</span> * Constructor setting the bins assuming a uniform distribution within a range.<a name="line.239"></a> +<span class="sourceLineNo">240</span> * @param numOfBins the number of bins for the histogram. A larger value results in more precise<a name="line.240"></a> +<span class="sourceLineNo">241</span> * results but with lower efficiency, and vice versus.<a name="line.241"></a> +<span class="sourceLineNo">242</span> * @param min lower bound of the region, inclusive.<a name="line.242"></a> +<span class="sourceLineNo">243</span> * @param max higher bound of the region, inclusive.<a name="line.243"></a> +<span class="sourceLineNo">244</span> */<a name="line.244"></a> +<span class="sourceLineNo">245</span> public FastLongHistogram(int numOfBins, long min, long max) {<a name="line.245"></a> +<span class="sourceLineNo">246</span> this(numOfBins);<a name="line.246"></a> +<span class="sourceLineNo">247</span> Bins bins = new Bins(numOfBins);<a name="line.247"></a> +<span class="sourceLineNo">248</span> bins.add(min, 1);<a name="line.248"></a> +<span class="sourceLineNo">249</span> bins.add(max, 1);<a name="line.249"></a> +<span class="sourceLineNo">250</span> this.bins = new Bins(bins, numOfBins, 0.01, 0.999);<a name="line.250"></a> +<span class="sourceLineNo">251</span> }<a name="line.251"></a> +<span class="sourceLineNo">252</span><a name="line.252"></a> +<span class="sourceLineNo">253</span> private FastLongHistogram(Bins bins) {<a name="line.253"></a> +<span class="sourceLineNo">254</span> this.bins = bins;<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> /**<a name="line.257"></a> +<span class="sourceLineNo">258</span> * Adds a value to the histogram.<a name="line.258"></a> +<span class="sourceLineNo">259</span> */<a name="line.259"></a> +<span class="sourceLineNo">260</span> public void add(long value, long count) {<a name="line.260"></a> +<span class="sourceLineNo">261</span> this.bins.add(value, count);<a name="line.261"></a> +<span class="sourceLineNo">262</span> }<a name="line.262"></a> +<span class="sourceLineNo">263</span><a name="line.263"></a> +<span class="sourceLineNo">264</span> /**<a name="line.264"></a> +<span class="sourceLineNo">265</span> * Computes the quantiles give the ratios.<a name="line.265"></a> +<span class="sourceLineNo">266</span> */<a name="line.266"></a> +<span class="sourceLineNo">267</span> public long[] getQuantiles(double[] quantiles) {<a name="line.267"></a> +<span class="sourceLineNo">268</span> return this.bins.getQuantiles(quantiles);<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> public long[] getQuantiles() {<a name="line.271"></a> +<span class="sourceLineNo">272</span> return this.bins.getQuantiles(DEFAULT_QUANTILES);<a name="line.272"></a> +<span class="sourceLineNo">273</span> }<a name="line.273"></a> +<span class="sourceLineNo">274</span><a name="line.274"></a> +<span class="sourceLineNo">275</span> public long getMin() {<a name="line.275"></a> +<span class="sourceLineNo">276</span> long min = this.bins.min.get();<a name="line.276"></a> +<span class="sourceLineNo">277</span> return min == Long.MAX_VALUE ? 0 : min; // in case it is not initialized<a name="line.277"></a> +<span class="sourceLineNo">278</span> }<a name="line.278"></a> +<span class="sourceLineNo">279</span><a name="line.279"></a> +<span class="sourceLineNo">280</span> public long getMax() {<a name="line.280"></a> +<span class="sourceLineNo">281</span> return this.bins.max.get();<a name="line.281"></a> +<span class="sourceLineNo">282</span> }<a name="line.282"></a> +<span class="sourceLineNo">283</span><a name="line.283"></a> +<span class="sourceLineNo">284</span> public long getCount() {<a name="line.284"></a> +<span class="sourceLineNo">285</span> return this.bins.count.sum();<a name="line.285"></a> <span class="sourceLineNo">286</span> }<a name="line.286"></a> <span class="sourceLineNo">287</span><a name="line.287"></a> -<span class="sourceLineNo">288</span> public long getMax() {<a name="line.288"></a> -<span class="sourceLineNo">289</span> return this.bins.max.get();<a name="line.289"></a> -<span class="sourceLineNo">290</span> }<a name="line.290"></a> -<span class="sourceLineNo">291</span><a name="line.291"></a> -<span class="sourceLineNo">292</span> public long getCount() {<a name="line.292"></a> -<span class="sourceLineNo">293</span> return this.bins.count.get();<a name="line.293"></a> -<span class="sourceLineNo">294</span> }<a name="line.294"></a> -<span class="sourceLineNo">295</span><a name="line.295"></a> -<span class="sourceLineNo">296</span> public long getMean() {<a name="line.296"></a> -<span class="sourceLineNo">297</span> Bins bins = this.bins;<a name="line.297"></a> -<span class="sourceLineNo">298</span> long count = bins.count.get();<a name="line.298"></a> -<span class="sourceLineNo">299</span> long total = bins.total.get();<a name="line.299"></a> -<span class="sourceLineNo">300</span> if (count == 0) {<a name="line.300"></a> -<span class="sourceLineNo">301</span> return 0;<a name="line.301"></a> -<span class="sourceLineNo">302</span> }<a name="line.302"></a> -<span class="sourceLineNo">303</span> return total / count;<a name="line.303"></a> -<span class="sourceLineNo">304</span> }<a name="line.304"></a> -<span class="sourceLineNo">305</span><a name="line.305"></a> -<span class="sourceLineNo">306</span> public long getNumAtOrBelow(long value) {<a name="line.306"></a> -<span class="sourceLineNo">307</span> return this.bins.getNumAtOrBelow(value);<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> /**<a name="line.310"></a> -<span class="sourceLineNo">311</span> * Resets the histogram for new counting.<a name="line.311"></a> -<span class="sourceLineNo">312</span> */<a name="line.312"></a> -<span class="sourceLineNo">313</span> public FastLongHistogram reset() {<a name="line.313"></a> -<span class="sourceLineNo">314</span> Bins oldBins = this.bins;<a name="line.314"></a> -<span class="sourceLineNo">315</span> this.bins = new Bins(this.bins, this.bins.counts.length - 3, 0.01, 0.99);<a name="line.315"></a> -<span class="sourceLineNo">316</span> return new FastLongHistogram(oldBins);<a name="line.316"></a> -<span class="sourceLineNo">317</span> }<a name="line.317"></a> -<span class="sourceLineNo">318</span>}<a name="line.318"></a> +<span class="sourceLineNo">288</span> public long getMean() {<a name="line.288"></a> +<span class="sourceLineNo">289</span> Bins bins = this.bins;<a name="line.289"></a> +<span class="sourceLineNo">290</span> long count = bins.count.sum();<a name="line.290"></a> +<span class="sourceLineNo">291</span> long total = bins.total.sum();<a name="line.291"></a> +<span class="sourceLineNo">292</span> if (count == 0) {<a name="line.292"></a> +<span class="sourceLineNo">293</span> return 0;<a name="line.293"></a> +<span class="sourceLineNo">294</span> }<a name="line.294"></a> +<span class="sourceLineNo">295</span> return total / count;<a name="line.295"></a> +<span class="sourceLineNo">296</span> }<a name="line.296"></a> +<span class="sourceLineNo">297</span><a name="line.297"></a> +<span class="sourceLineNo">298</span> public long getNumAtOrBelow(long value) {<a name="line.298"></a> +<span class="sourceLineNo">299</span> return this.bins.getNumAtOrBelow(value);<a name="line.299"></a> +<span class="sourceLineNo">300</span> }<a name="line.300"></a> +<span class="sourceLineNo">301</span><a name="line.301"></a> +<span class="sourceLineNo">302</span> /**<a name="line.302"></a> +<span class="sourceLineNo">303</span> * Resets the histogram for new counting.<a name="line.303"></a> +<span class="sourceLineNo">304</span> */<a name="line.304"></a> +<span class="sourceLineNo">305</span> public FastLongHistogram reset() {<a name="line.305"></a> +<span class="sourceLineNo">306</span> Bins oldBins = this.bins;<a name="line.306"></a> +<span class="sourceLineNo">307</span> this.bins = new Bins(this.bins, this.bins.counts.length - 3, 0.01, 0.99);<a name="line.307"></a> +<span class="sourceLineNo">308</span> return new FastLongHistogram(oldBins);<a name="line.308"></a> +<span class="sourceLineNo">309</span> }<a name="line.309"></a> +<span class="sourceLineNo">310</span>}<a name="line.310"></a>