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<div class="subTitle">org.apache.hadoop.hbase.client</div>
<h2 title="Class MasterRegistry" class="title">Class MasterRegistry</h2>
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<li>org.apache.hadoop.hbase.client.MasterRegistry</li>
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<dt>All Implemented Interfaces:</dt>
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<pre>@InterfaceAudience.Private
public class <a href="../../../../../src-html/org/apache/hadoop/hbase/client/MasterRegistry.html#line.82">MasterRegistry</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/client/ConnectionRegistry.html" title="interface in org.apache.hadoop.hbase.client">ConnectionRegistry</a></pre>
<div class="block">Master based registry implementation. Makes RPCs to the configured master addresses from config
<a href="../../../../../org/apache/hadoop/hbase/HConstants.html#MASTER_ADDRS_KEY">"hbase.masters"</a>.
<p/>
It supports hedged reads, set the fan out of the requests batch by
<a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY"><code>MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY</code></a> to a value greater than <code>1</code> will enable
it(the default value is <a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MASTER_REGISTRY_HEDGED_REQS_FANOUT_DEFAULT"><code>MASTER_REGISTRY_HEDGED_REQS_FANOUT_DEFAULT</code></a>).
<p/>
TODO: Handle changes to the configuration dynamically without having to restart the client.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>private static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.Callable.html" title="interface in org.apache.hadoop.hbase.client">MasterRegistry.Callable</a>&lt;<a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.Callable.html" title="type parameter in MasterRegistry.Callable">T</a>&gt;</span></code>
<div class="block">For describing the actual asynchronous rpc call.</div>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#hedgedReadFanOut">hedgedReadFanOut</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MASTER_ADDRS_CONF_SEPARATOR">MASTER_ADDRS_CONF_SEPARATOR</a></span></code>&nbsp;</td>
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<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MASTER_REGISTRY_HEDGED_REQS_FANOUT_DEFAULT">MASTER_REGISTRY_HEDGED_REQS_FANOUT_DEFAULT</a></span></code>
<div class="block">Default value for the fan out of hedged requests.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY">MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY</a></span></code>
<div class="block">Configuration key that controls the fan out of requests</div>
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<tr class="altColor">
<td class="colFirst"><code>private org.apache.hbase.thirdparty.com.google.common.collect.ImmutableMap&lt;<a href="../../../../../org/apache/hadoop/hbase/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>,org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ClientMetaService.Interface&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#masterAddr2Stub">masterAddr2Stub</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>protected <a href="../../../../../org/apache/hadoop/hbase/client/MasterAddressRefresher.html" title="class in org.apache.hadoop.hbase.client">MasterAddressRefresher</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#masterAddressRefresher">masterAddressRefresher</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcClient.html" title="interface in org.apache.hadoop.hbase.ipc">RpcClient</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#rpcClient">rpcClient</a></span></code>&nbsp;</td>
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<tr class="rowColor">
<td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ipc/RpcControllerFactory.html" title="class in org.apache.hadoop.hbase.ipc">RpcControllerFactory</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#rpcControllerFactory">rpcControllerFactory</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#rpcTimeoutMs">rpcTimeoutMs</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#MasterRegistry-org.apache.hadoop.conf.Configuration-">MasterRegistry</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<td class="colFirst"><code>private <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></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#badResponse-java.lang.String-">badResponse</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;debug)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>private &lt;T extends org.apache.hbase.thirdparty.com.google.protobuf.Message&gt;<br><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;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#call-org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ClientMetaService.Interface-org.apache.hadoop.hbase.client.MasterRegistry.Callable-">call</a></span>(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ClientMetaService.Interface&nbsp;stub,
<a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.Callable.html" title="interface in org.apache.hadoop.hbase.client">MasterRegistry.Callable</a>&lt;T&gt;&nbsp;callable)</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>private &lt;T extends org.apache.hbase.thirdparty.com.google.protobuf.Message&gt;<br><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;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#call-org.apache.hadoop.hbase.client.MasterRegistry.Callable-java.util.function.Predicate-java.lang.String-">call</a></span>(<a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.Callable.html" title="interface in org.apache.hadoop.hbase.client">MasterRegistry.Callable</a>&lt;T&gt;&nbsp;callable,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Predicate.html?is-external=true" title="class or interface in java.util.function">Predicate</a>&lt;T&gt;&nbsp;isValidResp,
<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;debug)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#close--">close</a></span>()</code>
<div class="block">Closes this instance and releases any system resources associated with it</div>
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<td class="colFirst"><code>private static <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/client/MasterRegistry.html#filterActiveMaster-org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersResponse-">filterActiveMaster</a></span>(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersResponse&nbsp;resp)</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code><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/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/client/MasterRegistry.html#getActiveMaster--">getActiveMaster</a></span>()</code>
<div class="block">Get the address of active HMaster.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code><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="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#getClusterId--">getClusterId</a></span>()</code>
<div class="block">Should only be called once.</div>
</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#getMasterAddr-org.apache.hadoop.conf.Configuration-">getMasterAddr</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf)</code>
<div class="block">Builds the default master address end point if it is not specified in the configuration.</div>
</td>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>(package private) <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="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;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#getMasters--">getMasters</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code><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;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#getMetaRegionLocations--">getMetaRegionLocations</a></span>()</code>
<div class="block">Get the location of meta region(s).</div>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>(package private) <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/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/client/MasterRegistry.html#getParsedMasterServers--">getParsedMasterServers</a></span>()</code>&nbsp;</td>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>private &lt;T extends org.apache.hbase.thirdparty.com.google.protobuf.Message&gt;<br>void</code></td>
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<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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;&nbsp;masterServers,
<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;org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.ClientMetaService.Interface&gt;&nbsp;masterStubs,
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<a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.Callable.html" title="interface in org.apache.hadoop.hbase.client">MasterRegistry.Callable</a>&lt;T&gt;&nbsp;callable,
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<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;debug,
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<div class="block">send requests concurrently to hedgedReadsFanout masters.</div>
</td>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>private static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/client/MasterRegistry.html#hasActiveMaster-org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersResponse-">hasActiveMaster</a></span>(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.GetMastersResponse&nbsp;resp)</code>&nbsp;</td>
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<td class="colFirst"><code>private static <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/ServerName.html" title="class in org.apache.hadoop.hbase">ServerName</a>&gt;</code></td>
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<div class="block">Parses the list of master addresses from the provided configuration. Supported format is comma
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>conf</code> - Configuration to parse from.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
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<div class="block">Builds the default master address end point if it is not specified in the configuration.
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Will be called in <code>HBaseTestingUtility</code>.</div>
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<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></code></dd>
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<div class="block">send requests concurrently to hedgedReadsFanout masters. If any of the request is succeeded, we
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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