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<h2 title="Class AsyncMetaRegionLocator" class="title">Class AsyncMetaRegionLocator</h2>
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<pre>@InterfaceAudience.Private
class <a href="../../../../../src-html/org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#line.37">AsyncMetaRegionLocator</a>
extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">The asynchronous locator for meta region.</div>
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<td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicReference.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicReference</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/RegionLocations.html" title="class in org.apache.hadoop.hbase">RegionLocations</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#metaRegionLocations">metaRegionLocations</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#AsyncMetaRegionLocator-org.apache.hadoop.hbase.client.ConnectionRegistry-">AsyncMetaRegionLocator</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/ConnectionRegistry.html" title="interface in org.apache.hadoop.hbase.client">ConnectionRegistry</a>&nbsp;registry)</code>&nbsp;</td>
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<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#addLocationToCache-org.apache.hadoop.hbase.HRegionLocation-">addLocationToCache</a></span>(<a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>&nbsp;loc)</code>&nbsp;</td>
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<td class="colFirst"><code>(package private) void</code></td>
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<td class="colFirst"><code>(package private) <a href="../../../../../org/apache/hadoop/hbase/RegionLocations.html" title="class in org.apache.hadoop.hbase">RegionLocations</a></code></td>
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<div class="block">Get the region locations for meta region.</div>
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<td class="colFirst"><code>private void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#removeLocationFromCache-org.apache.hadoop.hbase.HRegionLocation-">removeLocationFromCache</a></span>(<a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>&nbsp;loc)</code>&nbsp;</td>
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<td class="colFirst"><code>(package private) void</code></td>
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<pre>private final&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicReference.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicReference</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/RegionLocations.html" title="class in org.apache.hadoop.hbase">RegionLocations</a>&gt; <a href="../../../../../src-html/org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#line.41">metaRegionLocations</a></pre>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CompletableFuture.html?is-external=true" title="class or interface in java.util.concurrent">CompletableFuture</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/RegionLocations.html" title="class in org.apache.hadoop.hbase">RegionLocations</a>&gt;&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#line.59">getRegionLocations</a>(int&nbsp;replicaId,
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<div class="block">Get the region locations for meta region. If the location for the given replica is not
available in the cached locations, then fetch from the HBase cluster.
<p/>
The <code>replicaId</code> parameter is important. If the region replication config for meta
region is changed, then the cached region locations may not have the locations for new
replicas. If we do not check the location for the given replica, we will always return the
cached region locations and cause an infinite loop.</div>
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<pre>int&nbsp;<a href="../../../../../src-html/org/apache/hadoop/hbase/client/AsyncMetaRegionLocator.html#line.142">getNumberOfCachedRegionLocations</a>()</pre>
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