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| <h2 title="Class CostFunction" class="title">Class CostFunction</h2> |
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| <li>org.apache.hadoop.hbase.master.balancer.CostFunction</li> |
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| <dd><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFromRegionLoadFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFromRegionLoadFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/HeterogeneousRegionCountCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">HeterogeneousRegionCountCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LocalityBasedCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">LocalityBasedCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MoveCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">MoveCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/PrimaryRegionCountSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">PrimaryRegionCountSkewCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionCountSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionCountSkewCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaGroupingCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaGroupingCostFunction</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/TableSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">TableSkewCostFunction</a></dd> |
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| <br> |
| <pre>@InterfaceAudience.Private |
| abstract class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.26">CostFunction</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">Base class of StochasticLoadBalancer's Cost Functions.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#cluster">cluster</a></span></code> </td> |
| </tr> |
| <tr 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/CostFunction.html#COST_EPSILON">COST_EPSILON</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#multiplier">multiplier</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#CostFunction--">CostFunction</a></span>()</code> </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>protected abstract double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#cost--">cost</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) float</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#getMultiplier--">getMultiplier</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#isNeeded--">isNeeded</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#postAction-org.apache.hadoop.hbase.master.balancer.BalanceAction-">postAction</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a> action)</code> |
| <div class="block">Called once per cluster Action to give the cost function an opportunity to update it's state.</div> |
| </td> |
| </tr> |
| <tr id="i4" 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/CostFunction.html#prepare-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">prepare</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a> cluster)</code> |
| <div class="block">Called once per LB invocation to give the cost function to initialize it's state, and perform |
| any costly calculation.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#regionMoved-int-int-int-">regionMoved</a></span>(int region, |
| int oldServer, |
| int newServer)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>protected static double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#scale-double-double-double-">scale</a></span>(double min, |
| double max, |
| double value)</code> |
| <div class="block">Scale the value between 0 and 1.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>(package private) void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html#setMultiplier-float-">setMultiplier</a></span>(float m)</code> </td> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="COST_EPSILON"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>COST_EPSILON</h4> |
| <pre>public static final double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.28">COST_EPSILON</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.master.balancer.CostFunction.COST_EPSILON">Constant Field Values</a></dd> |
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| </a> |
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| <h4>multiplier</h4> |
| <pre>private float <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.30">multiplier</a></pre> |
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| <h4>cluster</h4> |
| <pre>protected <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.32">cluster</a></pre> |
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| <h3>Constructor Detail</h3> |
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| <li class="blockList"> |
| <h4>CostFunction</h4> |
| <pre><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.26">CostFunction</a>()</pre> |
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| <h4>isNeeded</h4> |
| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.34">isNeeded</a>()</pre> |
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| <h4>getMultiplier</h4> |
| <pre>float <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.38">getMultiplier</a>()</pre> |
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| <h4>setMultiplier</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.42">setMultiplier</a>(float m)</pre> |
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| <h4>prepare</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.50">prepare</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a> cluster)</pre> |
| <div class="block">Called once per LB invocation to give the cost function to initialize it's state, and perform |
| any costly calculation.</div> |
| </li> |
| </ul> |
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| </a> |
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| <h4>postAction</h4> |
| <pre>void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.59">postAction</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a> action)</pre> |
| <div class="block">Called once per cluster Action to give the cost function an opportunity to update it's state. |
| postAction() is always called at least once before cost() is called with the cluster that this |
| action is performed on.</div> |
| </li> |
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| <h4>regionMoved</h4> |
| <pre>protected void <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.81">regionMoved</a>(int region, |
| int oldServer, |
| int newServer)</pre> |
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| <a name="cost--"> |
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| <h4>cost</h4> |
| <pre>protected abstract double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.84">cost</a>()</pre> |
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| <h4>scale</h4> |
| <pre>protected static double <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/CostFunction.html#line.93">scale</a>(double min, |
| double max, |
| double value)</pre> |
| <div class="block">Scale the value between 0 and 1.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>min</code> - Min value</dd> |
| <dd><code>max</code> - The Max value</dd> |
| <dd><code>value</code> - The value to be scaled.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The scaled value.</dd> |
| </dl> |
| </li> |
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