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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.hadoop.hbase.master.balancer</a></div>
<h1 title="Class MaintenanceLoadBalancer" class="title">Class MaintenanceLoadBalancer</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">org.apache.hadoop.hbase.master.balancer.MaintenanceLoadBalancer</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="../../conf/ConfigurationObserver.html" title="interface in org.apache.hadoop.hbase.conf">ConfigurationObserver</a></code>, <code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code>, <code><a href="../../Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></code></dd>
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<hr>
<div class="type-signature"><span class="annotations">@Private
</span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-38">MaintenanceLoadBalancer</a></span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
implements <a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></span></div>
<div class="block">a balancer which is only used in maintenance mode.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- =========== FIELD SUMMARY =========== -->
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<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="caption"><span>Fields</span></div>
<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Field</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>private boolean</code></div>
<div class="col-second even-row-color"><code><a href="#stopped" class="member-name-link">stopped</a></code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
<div class="inherited-list">
<h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.master.LoadBalancer">Fields inherited from interface&nbsp;org.apache.hadoop.hbase.master.<a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></h3>
<code><a href="../LoadBalancer.html#BOGUS_SERVER_NAME">BOGUS_SERVER_NAME</a>, <a href="../LoadBalancer.html#HBASE_RSGROUP_LOADBALANCER_CLASS">HBASE_RSGROUP_LOADBALANCER_CLASS</a></code></div>
</section>
</li>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">MaintenanceLoadBalancer</a>()</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
<div id="method-summary-table.tabpanel" role="tabpanel">
<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>private <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#assign(java.util.Collection,java.util.List)" class="member-name-link">assign</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../RegionPlan.html" title="class in org.apache.hadoop.hbase.master">RegionPlan</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#balanceCluster(java.util.Map)" class="member-name-link">balanceCluster</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;&gt;&nbsp;loadOfAllTable)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Perform the major balance operation for cluster.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#initialize()" class="member-name-link">initialize</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Initialize the load balancer.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>boolean</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#isStopped()" class="member-name-link">isStopped</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns True if <a href="../../Stoppable.html#stop(java.lang.String)"><code>Stoppable.stop(String)</code></a> has been closed.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#onConfigurationChange(org.apache.hadoop.conf.Configuration)" class="member-name-link">onConfigurationChange</a><wbr>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Notification that config has changed</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#postMasterStartupInitialize()" class="member-name-link">postMasterStartupInitialize</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">If balancer needs to do initialization after Master has started up, lets do that here.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#randomAssignment(org.apache.hadoop.hbase.client.RegionInfo,java.util.List)" class="member-name-link">randomAssignment</a><wbr>(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Get a random region server from the list</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#regionOffline(org.apache.hadoop.hbase.client.RegionInfo)" class="member-name-link">regionOffline</a><wbr>(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Marks the region as offline at balancer.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#regionOnline(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.ServerName)" class="member-name-link">regionOnline</a><wbr>(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Marks the region as online at balancer.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#retainAssignment(java.util.Map,java.util.List)" class="member-name-link">retainAssignment</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<wbr><a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Assign regions to the previously hosting region server</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#roundRobinAssignment(java.util.List,java.util.List)" class="member-name-link">roundRobinAssignment</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Perform a Round Robin assignment of regions.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#setClusterInfoProvider(org.apache.hadoop.hbase.master.balancer.ClusterInfoProvider)" class="member-name-link">setClusterInfoProvider</a><wbr>(<a href="ClusterInfoProvider.html" title="interface in org.apache.hadoop.hbase.master.balancer">ClusterInfoProvider</a>&nbsp;provider)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Set the cluster info provider.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#stop(java.lang.String)" class="member-name-link">stop</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;why)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Stop this service.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#updateBalancerStatus(boolean)" class="member-name-link">updateBalancerStatus</a><wbr>(boolean&nbsp;status)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#updateClusterMetrics(org.apache.hadoop.hbase.ClusterMetrics)" class="member-name-link">updateClusterMetrics</a><wbr>(<a href="../../ClusterMetrics.html" title="interface in org.apache.hadoop.hbase">ClusterMetrics</a>&nbsp;st)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Set the current cluster status.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.master.LoadBalancer">Methods inherited from interface&nbsp;org.apache.hadoop.hbase.master.<a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></h3>
<code><a href="../LoadBalancer.html#updateBalancerLoadInfo(java.util.Map)">updateBalancerLoadInfo</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ============ FIELD DETAIL =========== -->
<li>
<section class="field-details" id="field-detail">
<h2>Field Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="stopped">
<h3>stopped</h3>
<div class="member-signature"><span class="modifiers">private volatile</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-41">stopped</a></span></div>
</section>
</li>
</ul>
</section>
</li>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>MaintenanceLoadBalancer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-39">MaintenanceLoadBalancer</a></span>()</div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="stop(java.lang.String)">
<h3>stop</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-43">stop</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;why)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../../Stoppable.html#stop(java.lang.String)">Stoppable</a></code></span></div>
<div class="block">Stop this service. Implementers should favor logging errors over throwing RuntimeExceptions.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../../Stoppable.html#stop(java.lang.String)">stop</a></code>&nbsp;in interface&nbsp;<code><a href="../../Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></code></dd>
<dt>Parameters:</dt>
<dd><code>why</code> - Why we're stopping.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isStopped()">
<h3>isStopped</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-48">isStopped</a></span>()</div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../../Stoppable.html#isStopped()">Stoppable</a></code></span></div>
<div class="block">Returns True if <a href="../../Stoppable.html#stop(java.lang.String)"><code>Stoppable.stop(String)</code></a> has been closed.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../../Stoppable.html#isStopped()">isStopped</a></code>&nbsp;in interface&nbsp;<code><a href="../../Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="updateClusterMetrics(org.apache.hadoop.hbase.ClusterMetrics)">
<h3>updateClusterMetrics</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-53">updateClusterMetrics</a></span><wbr><span class="parameters">(<a href="../../ClusterMetrics.html" title="interface in org.apache.hadoop.hbase">ClusterMetrics</a>&nbsp;st)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#updateClusterMetrics(org.apache.hadoop.hbase.ClusterMetrics)">LoadBalancer</a></code></span></div>
<div class="block">Set the current cluster status. This allows a LoadBalancer to map host name to a server</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#updateClusterMetrics(org.apache.hadoop.hbase.ClusterMetrics)">updateClusterMetrics</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="setClusterInfoProvider(org.apache.hadoop.hbase.master.balancer.ClusterInfoProvider)">
<h3>setClusterInfoProvider</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-57">setClusterInfoProvider</a></span><wbr><span class="parameters">(<a href="ClusterInfoProvider.html" title="interface in org.apache.hadoop.hbase.master.balancer">ClusterInfoProvider</a>&nbsp;provider)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#setClusterInfoProvider(org.apache.hadoop.hbase.master.balancer.ClusterInfoProvider)">LoadBalancer</a></code></span></div>
<div class="block">Set the cluster info provider. Usually it is just a wrapper of master.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#setClusterInfoProvider(org.apache.hadoop.hbase.master.balancer.ClusterInfoProvider)">setClusterInfoProvider</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="balanceCluster(java.util.Map)">
<h3>balanceCluster</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../RegionPlan.html" title="class in org.apache.hadoop.hbase.master">RegionPlan</a>&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-61">balanceCluster</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../TableName.html" title="class in org.apache.hadoop.hbase">TableName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;&gt;&nbsp;loadOfAllTable)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#balanceCluster(java.util.Map)">LoadBalancer</a></code></span></div>
<div class="block">Perform the major balance operation for cluster.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#balanceCluster(java.util.Map)">balanceCluster</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt>Parameters:</dt>
<dd><code>loadOfAllTable</code> - region load of servers for all table</dd>
<dt>Returns:</dt>
<dd>a list of regions to be moved, including source and destination, or null if cluster is
already balanced</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="assign(java.util.Collection,java.util.List)">
<h3>assign</h3>
<div class="member-signature"><span class="modifiers">private</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-68">assign</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Collection.html" title="class or interface in java.util" class="external-link">Collection</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</span></div>
</section>
</li>
<li>
<section class="detail" id="roundRobinAssignment(java.util.List,java.util.List)">
<h3>roundRobinAssignment</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-81">roundRobinAssignment</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#roundRobinAssignment(java.util.List,java.util.List)">LoadBalancer</a></code></span></div>
<div class="block">Perform a Round Robin assignment of regions.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#roundRobinAssignment(java.util.List,java.util.List)">roundRobinAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt>Returns:</dt>
<dd>Map of servername to regioninfos</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="retainAssignment(java.util.Map,java.util.List)">
<h3>retainAssignment</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,<wbr><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&gt;</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-87">retainAssignment</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<wbr><a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;regions,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#retainAssignment(java.util.Map,java.util.List)">LoadBalancer</a></code></span></div>
<div class="block">Assign regions to the previously hosting region server</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#retainAssignment(java.util.Map,java.util.List)">retainAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt>Returns:</dt>
<dd>List of plans</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="randomAssignment(org.apache.hadoop.hbase.client.RegionInfo,java.util.List)">
<h3>randomAssignment</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-93">randomAssignment</a></span><wbr><span class="parameters">(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</span>
throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#randomAssignment(org.apache.hadoop.hbase.client.RegionInfo,java.util.List)">LoadBalancer</a></code></span></div>
<div class="block">Get a random region server from the list</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#randomAssignment(org.apache.hadoop.hbase.client.RegionInfo,java.util.List)">randomAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt>Parameters:</dt>
<dd><code>regionInfo</code> - Region for which this selection is being done.</dd>
<dt>Throws:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="initialize()">
<h3>initialize</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-101">initialize</a></span>()</div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#initialize()">LoadBalancer</a></code></span></div>
<div class="block">Initialize the load balancer. Must be called after setters.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#initialize()">initialize</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="regionOnline(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.ServerName)">
<h3>regionOnline</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-105">regionOnline</a></span><wbr><span class="parameters">(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="../../ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#regionOnline(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.ServerName)">LoadBalancer</a></code></span></div>
<div class="block">Marks the region as online at balancer.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#regionOnline(org.apache.hadoop.hbase.client.RegionInfo,org.apache.hadoop.hbase.ServerName)">regionOnline</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="regionOffline(org.apache.hadoop.hbase.client.RegionInfo)">
<h3>regionOffline</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-109">regionOffline</a></span><wbr><span class="parameters">(<a href="../../client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#regionOffline(org.apache.hadoop.hbase.client.RegionInfo)">LoadBalancer</a></code></span></div>
<div class="block">Marks the region as offline at balancer.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#regionOffline(org.apache.hadoop.hbase.client.RegionInfo)">regionOffline</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="onConfigurationChange(org.apache.hadoop.conf.Configuration)">
<h3>onConfigurationChange</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-113">onConfigurationChange</a></span><wbr><span class="parameters">(org.apache.hadoop.conf.Configuration&nbsp;conf)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#onConfigurationChange(org.apache.hadoop.conf.Configuration)">LoadBalancer</a></code></span></div>
<div class="block">Notification that config has changed</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../../conf/ConfigurationObserver.html#onConfigurationChange(org.apache.hadoop.conf.Configuration)">onConfigurationChange</a></code>&nbsp;in interface&nbsp;<code><a href="../../conf/ConfigurationObserver.html" title="interface in org.apache.hadoop.hbase.conf">ConfigurationObserver</a></code></dd>
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#onConfigurationChange(org.apache.hadoop.conf.Configuration)">onConfigurationChange</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="postMasterStartupInitialize()">
<h3>postMasterStartupInitialize</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-117">postMasterStartupInitialize</a></span>()</div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="../LoadBalancer.html#postMasterStartupInitialize()">LoadBalancer</a></code></span></div>
<div class="block">If balancer needs to do initialization after Master has started up, lets do that here.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#postMasterStartupInitialize()">postMasterStartupInitialize</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="updateBalancerStatus(boolean)">
<h3>updateBalancerStatus</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html#line-121">updateBalancerStatus</a></span><wbr><span class="parameters">(boolean&nbsp;status)</span></div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../LoadBalancer.html#updateBalancerStatus(boolean)">updateBalancerStatus</a></code>&nbsp;in interface&nbsp;<code><a href="../LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
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