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 <div class="subTitle">org.apache.hadoop.hbase.master.balancer</div>
 <h2 title="Class StochasticLoadBalancer" class="title">Class StochasticLoadBalancer</h2>
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 <li><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer</a></li>
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 <ul class="inheritance">
 <li>org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer</li>
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 <pre>@InterfaceAudience.LimitedPrivate(value="Configuration")
 public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#line.105">StochasticLoadBalancer</a>
 extends <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">BaseLoadBalancer</a></pre>
 <div class="block"><p>
  This is a best effort load balancer. Given a Cost function F(C) =&gt; x It will randomly try and
  mutate the cluster to Cprime. If F(Cprime) &lt; F(C) then the new cluster state becomes the plan.
  It includes costs functions to compute the cost of:
  </p>
  <ul>
  <li>Region Load</li>
  <li>Table Load</li>
  <li>Data Locality</li>
  <li>Memstore Sizes</li>
  <li>Storefile Sizes</li>
  </ul>
  <p>
  Every cost function returns a number between 0 and 1 inclusive; where 0 is the lowest cost best
  solution, and 1 is the highest possible cost and the worst solution. The computed costs are
  scaled by their respective multipliers:
  </p>
  <ul>
  <li>hbase.master.balancer.stochastic.regionLoadCost</li>
  <li>hbase.master.balancer.stochastic.moveCost</li>
  <li>hbase.master.balancer.stochastic.tableLoadCost</li>
  <li>hbase.master.balancer.stochastic.localityCost</li>
  <li>hbase.master.balancer.stochastic.memstoreSizeCost</li>
  <li>hbase.master.balancer.stochastic.storefileSizeCost</li>
  </ul>
  <p>
  You can also add custom Cost function by setting the the following configuration value:
  </p>
  <ul>
  <li>hbase.master.balancer.stochastic.additionalCostFunctions</li>
  </ul>
  <p>
  All custom Cost Functions needs to extends <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer"><code>CostFunction</code></a>
  </p>
  <p>
  In addition to the above configurations, the balancer can be tuned by the following configuration
  values:
  </p>
  <ul>
  <li>hbase.master.balancer.stochastic.maxMoveRegions which controls what the max number of regions
  that can be moved in a single invocation of this balancer.</li>
  <li>hbase.master.balancer.stochastic.stepsPerRegion is the coefficient by which the number of
  regions is multiplied to try and get the number of times the balancer will mutate all
  servers.</li>
  <li>hbase.master.balancer.stochastic.maxSteps which controls the maximum number of times that the
  balancer will try and mutate all the servers. The balancer will use the minimum of this value and
  the above computation.</li>
  </ul>
  <p>
  This balancer is best used with hbase.master.loadbalance.bytable set to false so that the
  balancer gets the full picture of all loads on the cluster.
  </p></div>
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 <th class="colFirst" scope="col">Modifier and Type</th>
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 <th class="colFirst" scope="col">Modifier and Type</th>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a>&gt;</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/master/balancer/StochasticLoadBalancer.html#curFunctionCosts">curFunctionCosts</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private double</code></td>
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 <td class="colFirst"><code>protected static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#DEFAULT_KEEP_REGION_LOADS">DEFAULT_KEEP_REGION_LOADS</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static long</code></td>
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 <td class="colFirst"><code>protected static int</code></td>
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 <td class="colFirst"><code>protected static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#DEFAULT_MIN_COST_NEED_BALANCE">DEFAULT_MIN_COST_NEED_BALANCE</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#DEFAULT_RUN_MAX_STEPS">DEFAULT_RUN_MAX_STEPS</a></span></code>&nbsp;</td>
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 <tr class="altColor">
 <td class="colFirst"><code>protected static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#DEFAULT_STEPS_PER_REGION">DEFAULT_STEPS_PER_REGION</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#KEEP_REGION_LOADS">KEEP_REGION_LOADS</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html?is-external=true" title="class or interface in java.util">Deque</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerRegionLoad.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerRegionLoad</a>&gt;&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#loads">loads</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LocalityBasedCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">LocalityBasedCandidateGenerator</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#localityCandidateGenerator">localityCandidateGenerator</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ServerLocalityCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">ServerLocalityCostFunction</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#localityCost">localityCost</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>private static org.slf4j.Logger</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#LOG">LOG</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></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>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#minCostNeedBalance">minCostNeedBalance</a></span></code>&nbsp;</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/master/balancer/StochasticLoadBalancer.html#numRegionLoadsToRemember">numRegionLoadsToRemember</a></span></code>&nbsp;</td>
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 <tr class="rowColor">
 <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#OVERALL_COST_FUNCTION_NAME">OVERALL_COST_FUNCTION_NAME</a></span></code>&nbsp;</td>
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#rackLocalityCost">rackLocalityCost</a></span></code>&nbsp;</td>
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#regionReplicaHostCostFunction">regionReplicaHostCostFunction</a></span></code>&nbsp;</td>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>private boolean</code></td>
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 <td class="colFirst"><code>protected static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
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 <td class="colFirst"><code>private double[]</code></td>
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 <code><a href="../../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#BOGUS_SERVER_NAME">BOGUS_SERVER_NAME</a>, <a href="../../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#HBASE_RSGROUP_LOADBALANCER_CLASS">HBASE_RSGROUP_LOADBALANCER_CLASS</a></code></li>
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 <h3>Constructor Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
 <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colOne" scope="col">Constructor and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#StochasticLoadBalancer--">StochasticLoadBalancer</a></span>()</code>
 <div class="block">The constructor that pass a MetricsStochasticBalancer to BaseLoadBalancer to replace its
  default MetricsBalancer</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#StochasticLoadBalancer-org.apache.hadoop.hbase.master.balancer.MetricsStochasticBalancer-">StochasticLoadBalancer</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsStochasticBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">MetricsStochasticBalancer</a>&nbsp;metricsStochasticBalancer)</code>&nbsp;</td>
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 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#addCostFunction-org.apache.hadoop.hbase.master.balancer.CostFunction-">addCostFunction</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a>&nbsp;costFunction)</code>&nbsp;</td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#areSomeRegionReplicasColocated-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">areSomeRegionReplicasColocated</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;c)</code>&nbsp;</td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/RegionPlan.html" title="class in org.apache.hadoop.hbase.master">RegionPlan</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#balanceTable-org.apache.hadoop.hbase.TableName-java.util.Map-">balanceTable</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
             <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;&nbsp;loadOfOneTable)</code>
 <div class="block">Given the cluster state this will try and approach an optimal balance.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#calculateMaxSteps-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">calculateMaxSteps</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster)</code>&nbsp;</td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>(package private) static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#composeAttributeName-java.lang.String-java.lang.String-">composeAttributeName</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;tableName,
                     <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;costFunctionName)</code>
 <div class="block">A helper function to compose the attribute name from tablename and costfunction name</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>(package private) double</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#computeCost-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-double-">computeCost</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster,
            double&nbsp;previousCost)</code>
 <div class="block">This is the main cost function.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">CandidateGenerator</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#createCandidateGenerators--">createCandidateGenerators</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>private static <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#createCostFunction-java.lang.Class-org.apache.hadoop.conf.Configuration-">createCostFunction</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;? extends <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a>&gt;&nbsp;clazz,
                   org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/RegionPlan.html" title="class in org.apache.hadoop.hbase.master">RegionPlan</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#createRegionPlans-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">createRegionPlans</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster)</code>
 <div class="block">Create all of the RegionPlan's needed to move from the initial cluster state to the desired
  state.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#functionCost--">functionCost</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#getBalanceReason-double-double-">getBalanceReason</a></span>(double&nbsp;total,
                 double&nbsp;sumMultiplier)</code>&nbsp;</td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">CandidateGenerator</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#getCandidateGenerators--">getCandidateGenerators</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#getCostFunctionNames--">getCostFunctionNames</a></span>()</code>
 <div class="block">Get the names of the cost functions</div>
 </td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>protected <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">CandidateGenerator</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#getRandomGenerator--">getRandomGenerator</a></span>()</code>
 <div class="block">Select the candidate generator to use based on the cost of cost functions.</div>
 </td>
 </tr>
 <tr id="i14" 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/StochasticLoadBalancer.html#initCosts-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">initCosts</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster)</code>&nbsp;</td>
 </tr>
 <tr id="i15" 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/StochasticLoadBalancer.html#loadConf-org.apache.hadoop.conf.Configuration-">loadConf</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#loadCustomCostFunctions-org.apache.hadoop.conf.Configuration-">loadCustomCostFunctions</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>(package private) boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#needsBalance-org.apache.hadoop.hbase.TableName-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">needsBalance</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
             <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster)</code>&nbsp;</td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#nextAction-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-">nextAction</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster)</code>&nbsp;</td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#sendRegionPlansToRingBuffer-java.util.List-double-double-java.lang.String-long-">sendRegionPlansToRingBuffer</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/RegionPlan.html" title="class in org.apache.hadoop.hbase.master">RegionPlan</a>&gt;&nbsp;plans,
                            double&nbsp;currentCost,
                            double&nbsp;initCost,
                            <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;initFunctionTotalCosts,
                            long&nbsp;step)</code>&nbsp;</td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#sendRejectionReasonToRingBuffer-java.util.function.Supplier-java.util.List-">sendRejectionReasonToRingBuffer</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Supplier.html?is-external=true" title="class or interface in java.util.function">Supplier</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;&nbsp;reason,
                                <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a>&gt;&nbsp;costFunctions)</code>&nbsp;</td>
 </tr>
 <tr id="i21" 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/StochasticLoadBalancer.html#setRackManager-org.apache.hadoop.hbase.master.RackManager-">setRackManager</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/RackManager.html" title="class in org.apache.hadoop.hbase.master">RackManager</a>&nbsp;rackManager)</code>&nbsp;</td>
 </tr>
 <tr id="i22" class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#totalCostsPerFunc--">totalCostsPerFunc</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i23" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#updateBalancerLoadInfo-java.util.Map-">updateBalancerLoadInfo</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;&gt;&nbsp;loadOfAllTable)</code>
 <div class="block">In some scenarios, Balancer needs to update internal status or information according to the
  current tables load</div>
 </td>
 </tr>
 <tr id="i24" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#updateBalancerTableLoadInfo-org.apache.hadoop.hbase.TableName-java.util.Map-">updateBalancerTableLoadInfo</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>&nbsp;tableName,
                            <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;&nbsp;loadOfOneTable)</code>&nbsp;</td>
 </tr>
 <tr id="i25" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#updateClusterMetrics-org.apache.hadoop.hbase.ClusterMetrics-">updateClusterMetrics</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/ClusterMetrics.html" title="interface in org.apache.hadoop.hbase">ClusterMetrics</a>&nbsp;st)</code>
 <div class="block">Set the current cluster status.</div>
 </td>
 </tr>
 <tr id="i26" 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/StochasticLoadBalancer.html#updateCostsAndWeightsWithAction-org.apache.hadoop.hbase.master.balancer.BalancerClusterState-org.apache.hadoop.hbase.master.balancer.BalanceAction-">updateCostsAndWeightsWithAction</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster,
                                <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a>&nbsp;action)</code>
 <div class="block">Update both the costs of costfunctions and the weights of candidate generators</div>
 </td>
 </tr>
 <tr id="i27" 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/StochasticLoadBalancer.html#updateMetricsSize-int-">updateMetricsSize</a></span>(int&nbsp;size)</code>
 <div class="block">Update the number of metrics that are reported to JMX</div>
 </td>
 </tr>
 <tr id="i28" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#updateRegionLoad--">updateRegionLoad</a></span>()</code>
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 <pre>void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#line.748">updateCostsAndWeightsWithAction</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster,
                                      <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a>&nbsp;action)</pre>
 <div class="block">Update both the costs of costfunctions and the weights of candidate generators</div>
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#line.766">getCostFunctionNames</a>()</pre>
 <div class="block">Get the names of the cost functions</div>
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 <pre>double&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#line.786">computeCost</a>(<a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a>&nbsp;cluster,
                    double&nbsp;previousCost)</pre>
 <div class="block">This is the main cost function. It will compute a cost associated with a proposed cluster
  state. All different costs will be combined with their multipliers to produce a double cost.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cluster</code> - The state of the cluster</dd>
 <dd><code>previousCost</code> - the previous cost. This is used as an early out.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a double of a cost associated with the proposed cluster state. This cost is an
          aggregate of all individual cost functions.</dd>
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 <pre>static&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html#line.814">composeAttributeName</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;tableName,
                                    <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;costFunctionName)</pre>
 <div class="block">A helper function to compose the attribute name from tablename and costfunction name</div>
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