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<div class="subTitle">org.apache.hadoop.hbase.rsgroup</div>
<h2 title="Class RSGroupBasedLoadBalancer" class="title">Class RSGroupBasedLoadBalancer</h2>
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<ul class="inheritance">
<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<li>org.apache.hadoop.hbase.rsgroup.RSGroupBasedLoadBalancer</li>
</ul>
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<div class="description">
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/hadoop/hbase/conf/ConfigurationObserver.html" title="interface in org.apache.hadoop.hbase.conf">ConfigurationObserver</a>, <a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a>, <a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></dd>
</dl>
<hr>
<br>
<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.71">RSGroupBasedLoadBalancer</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>
implements <a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></pre>
<div class="block">GroupBasedLoadBalancer, used when Region Server Grouping is configured (HBase-6721) It does
region balance based on a table's group membership.
<p/>
Most assignment methods contain two exclusive code paths: Online - when the group table is online
and Offline - when it is unavailable.
<p/>
During Offline, assignments are assigned based on cached information in zookeeper. If unavailable
(ie bootstrap) then regions are assigned randomly.
<p/>
Once the GROUP table has been assigned, the balancer switches to Online and will then start
providing appropriate assignments for user tables.</div>
</li>
</ul>
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<h3>Field Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<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>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/rsgroup/RSGroupBasedLoadBalancer.html#FALLBACK_GROUP_ENABLE_KEY">FALLBACK_GROUP_ENABLE_KEY</a></span></code>
<div class="block">Set this key to <code>true</code> to allow region fallback.</div>
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</tr>
<tr class="rowColor">
<td class="colFirst"><code>private boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#fallbackEnabled">fallbackEnabled</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/favored/FavoredNodesManager.html" title="class in org.apache.hadoop.hbase.favored">FavoredNodesManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#favoredNodesManager">favoredNodesManager</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#internalBalancer">internalBalancer</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#LOG">LOG</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#masterServices">masterServices</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/master/balancer/ClusterInfoProvider.html" title="interface in org.apache.hadoop.hbase.master.balancer">ClusterInfoProvider</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#provider">provider</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupInfoManager.html" title="interface in org.apache.hadoop.hbase.rsgroup">RSGroupInfoManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#rsGroupInfoManager">rsGroupInfoManager</a></span></code>&nbsp;</td>
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<h3>Fields inherited from interface&nbsp;org.apache.hadoop.hbase.master.<a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></h3>
<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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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#RSGroupBasedLoadBalancer--">RSGroupBasedLoadBalancer</a></span>()</code>
<div class="block">Used by reflection in <a href="../../../../../org/apache/hadoop/hbase/master/balancer/LoadBalancerFactory.html" title="class in org.apache.hadoop.hbase.master.balancer"><code>LoadBalancerFactory</code></a>.</div>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</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><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/rsgroup/RSGroupBasedLoadBalancer.html#balanceCluster-java.util.Map-">balanceCluster</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">Balance by RSGroup.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;<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;,<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;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#correctAssignments-java.util.Map-">correctAssignments</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;existingAssignments)</code>&nbsp;</td>
</tr>
<tr id="i2" 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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#filterOfflineServers-org.apache.hadoop.hbase.rsgroup.RSGroupInfo-java.util.List-">filterOfflineServers</a></span>(<a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupInfo.html" title="class in org.apache.hadoop.hbase.rsgroup">RSGroupInfo</a>&nbsp;RSGroupInfo,
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;onlineServers)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#filterServers-java.util.Set-java.util.List-">filterServers</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/net/Address.html" title="class in org.apache.hadoop.hbase.net">Address</a>&gt;&nbsp;servers,
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;onlineServers)</code>
<div class="block">Filter servers based on the online servers.</div>
</td>
</tr>
<tr id="i4" 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/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a>&lt;<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;,<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#generateGroupAssignments-java.util.List-java.util.List-">generateGroupAssignments</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/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#getFallBackCandidates-java.util.List-">getFallBackCandidates</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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/favored/FavoredNodesManager.html" title="class in org.apache.hadoop.hbase.favored">FavoredNodesManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#getFavoredNodesManager--">getFavoredNodesManager</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#getInternalBalancer--">getInternalBalancer</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#initialize--">initialize</a></span>()</code>
<div class="block">Initialize the load balancer.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#isFallbackEnabled--">isFallbackEnabled</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#isOnline--">isOnline</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#isStopped--">isStopped</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#onConfigurationChange-org.apache.hadoop.conf.Configuration-">onConfigurationChange</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>
<div class="block">Notification that config has changed</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#postMasterStartupInitialize--">postMasterStartupInitialize</a></span>()</code>
<div class="block">If balancer needs to do initialization after Master has started up, lets do that here.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#randomAssignment-org.apache.hadoop.hbase.client.RegionInfo-java.util.List-">randomAssignment</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;region,
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<div class="block">Get a random region server from the list</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#regionOffline-org.apache.hadoop.hbase.client.RegionInfo-">regionOffline</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo)</code>
<div class="block">Marks the region as offline at balancer.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#regionOnline-org.apache.hadoop.hbase.client.RegionInfo-org.apache.hadoop.hbase.ServerName-">regionOnline</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&nbsp;regionInfo,
<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&nbsp;sn)</code>
<div class="block">Marks the region as online at balancer.</div>
</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><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;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#retainAssignment-java.util.Map-java.util.List-">retainAssignment</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/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;regions,
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<div class="block">Assign regions to the previously hosting region server</div>
</td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#roundRobinAssignment-java.util.List-java.util.List-">roundRobinAssignment</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/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>&gt;&nbsp;regions,
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<div class="block">Perform a Round Robin assignment of regions.</div>
</td>
</tr>
<tr id="i19" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#setClusterInfoProvider-org.apache.hadoop.hbase.master.balancer.ClusterInfoProvider-">setClusterInfoProvider</a></span>(<a href="../../../../../org/apache/hadoop/hbase/master/balancer/ClusterInfoProvider.html" title="interface in org.apache.hadoop.hbase.master.balancer">ClusterInfoProvider</a>&nbsp;provider)</code>
<div class="block">Set the cluster info provider.</div>
</td>
</tr>
<tr id="i20" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#setMasterServices-org.apache.hadoop.hbase.master.MasterServices-">setMasterServices</a></span>(<a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a>&nbsp;masterServices)</code>&nbsp;</td>
</tr>
<tr id="i21" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#stop-java.lang.String-">stop</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;why)</code>
<div class="block">Stop this service.</div>
</td>
</tr>
<tr id="i22" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#updateBalancerStatus-boolean-">updateBalancerStatus</a></span>(boolean&nbsp;status)</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/rsgroup/RSGroupBasedLoadBalancer.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;sm)</code>
<div class="block">Set the current cluster status.</div>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.72">LOG</a></pre>
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<div class="block">Set this key to <code>true</code> to allow region fallback.
Fallback to the default rsgroup first, then fallback to any group if no online servers in
default rsgroup.
Please keep balancer switch on at the same time, which is relied on to correct misplaced
regions</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../constant-values.html#org.apache.hadoop.hbase.rsgroup.RSGroupBasedLoadBalancer.FALLBACK_GROUP_ENABLE_KEY">Constant Field Values</a></dd>
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<pre>private volatile&nbsp;boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.89">fallbackEnabled</a></pre>
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<pre>@InterfaceAudience.Private
public&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.95">RSGroupBasedLoadBalancer</a>()</pre>
<div class="block">Used by reflection in <a href="../../../../../org/apache/hadoop/hbase/master/balancer/LoadBalancerFactory.html" title="class in org.apache.hadoop.hbase.master.balancer"><code>LoadBalancerFactory</code></a>.</div>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.99">updateClusterMetrics</a>(<a href="../../../../../org/apache/hadoop/hbase/ClusterMetrics.html" title="interface in org.apache.hadoop.hbase">ClusterMetrics</a>&nbsp;sm)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/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>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#updateClusterMetrics-org.apache.hadoop.hbase.ClusterMetrics-">updateClusterMetrics</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.104">setMasterServices</a>(<a href="../../../../../org/apache/hadoop/hbase/master/MasterServices.html" title="interface in org.apache.hadoop.hbase.master">MasterServices</a>&nbsp;masterServices)</pre>
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<h4>balanceCluster</h4>
<pre>public&nbsp;<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;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.112">balanceCluster</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/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)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Balance by RSGroup.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#balanceCluster-java.util.Map-">balanceCluster</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>loadOfAllTable</code> - region load of servers for all table</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a list of regions to be moved, including source and destination, or null if cluster is
already balanced</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>@NonNull
public&nbsp;<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;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.162">roundRobinAssignment</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;&nbsp;regions,
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/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>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#roundRobinAssignment-java.util.List-java.util.List-">roundRobinAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Map of servername to regioninfos</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<pre>@NonNull
public&nbsp;<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;<a href="../../../../../src-html/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.html#line.178">retainAssignment</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/client/RegionInfo.html" title="interface in org.apache.hadoop.hbase.client">RegionInfo</a>,<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;regions,
<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;servers)
throws <a href="../../../../../org/apache/hadoop/hbase/HBaseIOException.html" title="class in org.apache.hadoop.hbase">HBaseIOException</a></pre>
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<div class="block">Assign regions to the previously hosting region server</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#retainAssignment-java.util.Map-java.util.List-">retainAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>List of plans</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/hadoop/hbase/HBaseIOException.html" title="class in org.apache.hadoop.hbase">HBaseIOException</a></code></dd>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/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>
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#randomAssignment-org.apache.hadoop.hbase.client.RegionInfo-java.util.List-">randomAssignment</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>region</code> - Region for which this selection is being done.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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throws <a href="../../../../../org/apache/hadoop/hbase/HBaseIOException.html" title="class in org.apache.hadoop.hbase">HBaseIOException</a></pre>
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<div class="block">Filter servers based on the online servers.
<p/>
servers is actually a TreeSet (see <a href="../../../../../org/apache/hadoop/hbase/rsgroup/RSGroupInfo.html" title="class in org.apache.hadoop.hbase.rsgroup"><code>RSGroupInfo</code></a>), having
its contains()'s time complexity as O(logn), which is good enough.
<p/>
TODO: consider using HashSet to pursue O(1) for contains() throughout the calling chain if
needed.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>servers</code> - the servers</dd>
<dd><code>onlineServers</code> - List of servers which are online.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the list</dd>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#initialize--">LoadBalancer</a></code></span></div>
<div class="block">Initialize the load balancer. Must be called after setters.</div>
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#initialize--">initialize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/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>
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<div class="block">Marks the region as offline at balancer.</div>
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html#regionOffline-org.apache.hadoop.hbase.client.RegionInfo-">regionOffline</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master">LoadBalancer</a></code></dd>
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<div class="block">Stop this service.
Implementers should favor logging errors over throwing RuntimeExceptions.</div>
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<dd><code><a href="../../../../../org/apache/hadoop/hbase/Stoppable.html#stop-java.lang.String-">stop</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/hadoop/hbase/Stoppable.html" title="interface in org.apache.hadoop.hbase">Stoppable</a></code></dd>
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<div class="block">If balancer needs to do initialization after Master has started up, lets do that here.</div>
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