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| <h2 title="Class DoubleArrayCost" class="title">Class DoubleArrayCost</h2> |
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| <pre>@InterfaceAudience.Private |
| final class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.30">DoubleArrayCost</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">A helper class to compute a scaled cost using |
| <code>org.apache.commons.math3.stat.descriptive.DescriptiveStatistics#DescriptiveStatistics()</code>. |
| It assumes that this is a zero sum set of costs. It assumes that the worst case possible is all |
| of the elements in one region server and the rest having 0.</div> |
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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/master/balancer/DoubleArrayCost.html#cost">cost</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private double[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#costs">costs</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#costsChanged">costsChanged</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#DoubleArrayCost--">DoubleArrayCost</a></span>()</code> </td> |
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| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#applyCostsChange-java.util.function.Consumer-">applyCostsChange</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><double[]> consumer)</code> |
| <div class="block">We do not want to introduce a getCosts method to let upper layer get the cost array directly, |
| so here we introduce this method to take a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> as parameter, where we will pass |
| the actual cost array in, so you can change the element of the cost array in the |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> implementation.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>private static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#computeCost-double:A-">computeCost</a></span>(double[] stats)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#cost--">cost</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#getMaxSkew-double-double-">getMaxSkew</a></span>(double total, |
| double numServers)</code> |
| <div class="block">Return the max deviation of distribution |
| Compute max as if all region servers had 0 and one had the sum of all costs.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#getMinSkew-double-double-">getMinSkew</a></span>(double total, |
| double numServers)</code> |
| <div class="block">Return the min skew of distribution</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#getSum-double:A-">getSum</a></span>(double[] stats)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#prepare-int-">prepare</a></span>(int length)</code> </td> |
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| <h4>costs</h4> |
| <pre>private double[] <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.32">costs</a></pre> |
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| <h4>costsChanged</h4> |
| <pre>private boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.36">costsChanged</a></pre> |
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| <h4>cost</h4> |
| <pre>private double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.38">cost</a></pre> |
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| <h4>DoubleArrayCost</h4> |
| <pre><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.30">DoubleArrayCost</a>()</pre> |
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| <h4>prepare</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.40">prepare</a>(int length)</pre> |
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| <h4>applyCostsChange</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.55">applyCostsChange</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function">Consumer</a><double[]> consumer)</pre> |
| <div class="block">We do not want to introduce a getCosts method to let upper layer get the cost array directly, |
| so here we introduce this method to take a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> as parameter, where we will pass |
| the actual cost array in, so you can change the element of the cost array in the |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html?is-external=true" title="class or interface in java.util.function"><code>Consumer</code></a> implementation. |
| <p/> |
| Usually, in prepare method, you need to fill all the elements of the cost array, while in |
| regionMoved method, you just need to update the element for the effect region servers.</div> |
| </li> |
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| <h4>cost</h4> |
| <pre>double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.60">cost</a>()</pre> |
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| <pre>private static double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.68">computeCost</a>(double[] stats)</pre> |
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| <pre>private static double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.84">getSum</a>(double[] stats)</pre> |
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| <h4>getMinSkew</h4> |
| <pre>public static double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.96">getMinSkew</a>(double total, |
| double numServers)</pre> |
| <div class="block">Return the min skew of distribution</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>total</code> - is total number of regions</dd> |
| </dl> |
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| <h4>getMaxSkew</h4> |
| <pre>public static double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html#line.116">getMaxSkew</a>(double total, |
| double numServers)</pre> |
| <div class="block">Return the max deviation of distribution |
| Compute max as if all region servers had 0 and one had the sum of all costs. This must be |
| a zero sum cost for this to make sense.</div> |
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