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| <h2 title="Class RollingStatCalculator" class="title">Class RollingStatCalculator</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RollingStatCalculator.html#line.36">RollingStatCalculator</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">This class maintains mean and variation for any sequence of input provided to it. |
| It is initialized with number of rolling periods which basically means the number of past |
| inputs whose data will be considered to maintain mean and variation. |
| It will use O(N) memory to maintain these statistics, where N is number of look up periods it |
| was initialized with. |
| If zero is passed during initialization then it will maintain mean and variance from the |
| start. It will use O(1) memory only. But note that since it will maintain mean / variance |
| from the start the statistics may behave like constants and may ignore short trends. |
| All operations are O(1) except the initialization which is O(N).</div> |
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| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#currentIndexPosition">currentIndexPosition</a></span></code> </td> |
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| <td class="colFirst"><code>private double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#currentSqrSum">currentSqrSum</a></span></code> </td> |
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| <td class="colFirst"><code>private double</code></td> |
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| <td class="colFirst"><code>private long[]</code></td> |
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| <td class="colFirst"><code>private long</code></td> |
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| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#rollingPeriod">rollingPeriod</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#RollingStatCalculator-int-">RollingStatCalculator</a></span>(int rollingPeriod)</code> |
| <div class="block">Creates a RollingStatCalculator with given number of rolling periods.</div> |
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| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#getDeviation--">getDeviation</a></span>()</code> </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#getMean--">getMean</a></span>()</code> </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#insertDataValue-long-">insertDataValue</a></span>(long data)</code> |
| <div class="block">Inserts given data value to array of data values to be considered for statistics calculation</div> |
| </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RollingStatCalculator.html#removeData-long-">removeData</a></span>(long data)</code> |
| <div class="block">Update the statistics after removing the given data value</div> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RollingStatCalculator.html#line.50">RollingStatCalculator</a>(int rollingPeriod)</pre> |
| <div class="block">Creates a RollingStatCalculator with given number of rolling periods.</div> |
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| <dd><code>rollingPeriod</code> - </dd> |
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| <div class="block">Inserts given data value to array of data values to be considered for statistics calculation</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - </dd> |
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| <div class="block">Update the statistics after removing the given data value</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - </dd> |
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| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>mean of the data values that are in the current list of data values</dd> |
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| <dd>deviation of the data values that are in the current list of data values</dd> |
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| <dt><span class="returnLabel">Returns:</span></dt> |
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