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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-project-dist / hadoop-hdfs-client / build / source / hadoop-hdfs-project / hadoop-hdfs-client / target / api / org / apache / hadoop / hdfs / server / namenode / ha / RequestHedgingProxyProvider.html
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<div class="subTitle">org.apache.hadoop.hdfs.server.namenode.ha</div>
<h2 title="Class RequestHedgingProxyProvider" class="title">Class RequestHedgingProxyProvider&lt;T&gt;</h2>
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<li><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider</a>&lt;T&gt;</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</a>&lt;T&gt;</li>
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<ul class="inheritance">
<li>org.apache.hadoop.hdfs.server.namenode.ha.RequestHedgingProxyProvider&lt;T&gt;</li>
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<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, org.apache.hadoop.io.retry.FailoverProxyProvider&lt;T&gt;</dd>
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<pre>public class <span class="typeNameLabel">RequestHedgingProxyProvider&lt;T&gt;</span>
extends <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">ConfiguredFailoverProxyProvider</a>&lt;T&gt;</pre>
<div class="block">A FailoverProxyProvider implementation that technically does not "failover"
per-se. It constructs a wrapper proxy that sends the request to ALL
underlying proxies simultaneously. It assumes the in an HA setup, there will
be only one Active, and the active should respond faster than any configured
standbys. Once it receive a response from any one of the configured proxies,
outstanding requests to other proxies are immediately cancelled.</div>
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<h3>Nested classes/interfaces inherited from class&nbsp;org.apache.hadoop.hdfs.server.namenode.ha.<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">AbstractNNFailoverProxyProvider</a></h3>
<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.NNProxyInfo.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">AbstractNNFailoverProxyProvider.NNProxyInfo</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.NNProxyInfo.html" title="type parameter in AbstractNNFailoverProxyProvider.NNProxyInfo">T</a>&gt;</code></li>
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<h3>Nested classes/interfaces inherited from interface&nbsp;org.apache.hadoop.io.retry.FailoverProxyProvider</h3>
<code>org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo&lt;T&gt;</code></li>
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<td class="colFirst"><code>static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html#LOG">LOG</a></span></code>&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.hadoop.hdfs.server.namenode.ha.<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">ConfiguredFailoverProxyProvider</a></h3>
<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#proxies">proxies</a></code></li>
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<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#conf">conf</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#factory">factory</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#fallbackToSimpleAuth">fallbackToSimpleAuth</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#ugi">ugi</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#xface">xface</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html#RequestHedgingProxyProvider-org.apache.hadoop.conf.Configuration-java.net.URI-java.lang.Class-org.apache.hadoop.hdfs.server.namenode.ha.HAProxyFactory-">RequestHedgingProxyProvider</a></span>(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;uri,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;&nbsp;xface,
org.apache.hadoop.hdfs.server.namenode.ha.HAProxyFactory&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;&nbsp;proxyFactory)</code>&nbsp;</td>
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<td class="colFirst"><code>org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html#getProxy--">getProxy</a></span>()</code>
<div class="block">Lazily initialize the RPC proxy object.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html#performFailover-T-">performFailover</a></span>(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&nbsp;currentProxy)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.apache.hadoop.hdfs.server.namenode.ha.<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">ConfiguredFailoverProxyProvider</a></h3>
<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#close--">close</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#useLogicalURI--">useLogicalURI</a></code></li>
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<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#createProxyIfNeeded-org.apache.hadoop.hdfs.server.namenode.ha.AbstractNNFailoverProxyProvider.NNProxyInfo-">createProxyIfNeeded</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#getFallbackToSimpleAuth--">getFallbackToSimpleAuth</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#getInterface--">getInterface</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#getProxyAddresses-java.net.URI-java.lang.String-">getProxyAddresses</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#getRandomOrder-org.apache.hadoop.conf.Configuration-java.net.URI-">getRandomOrder</a>, <a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/AbstractNNFailoverProxyProvider.html#setFallbackToSimpleAuth-java.util.concurrent.atomic.AtomicBoolean-">setFallbackToSimpleAuth</a></code></li>
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<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>LOG</h4>
<pre>public static final&nbsp;org.slf4j.Logger LOG</pre>
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<a name="RequestHedgingProxyProvider-org.apache.hadoop.conf.Configuration-java.net.URI-java.lang.Class-org.apache.hadoop.hdfs.server.namenode.ha.HAProxyFactory-">
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<h4>RequestHedgingProxyProvider</h4>
<pre>public&nbsp;RequestHedgingProxyProvider(org.apache.hadoop.conf.Configuration&nbsp;conf,
<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>&nbsp;uri,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;&nbsp;xface,
org.apache.hadoop.hdfs.server.namenode.ha.HAProxyFactory&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;&nbsp;proxyFactory)</pre>
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<h4>getProxy</h4>
<pre>public&nbsp;org.apache.hadoop.io.retry.FailoverProxyProvider.ProxyInfo&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;&nbsp;getProxy()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#getProxy--">ConfiguredFailoverProxyProvider</a></code></span></div>
<div class="block">Lazily initialize the RPC proxy object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>getProxy</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.io.retry.FailoverProxyProvider&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;</code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#getProxy--">getProxy</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">ConfiguredFailoverProxyProvider</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;</code></dd>
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<h4>performFailover</h4>
<pre>public&nbsp;void&nbsp;performFailover(<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&nbsp;currentProxy)</pre>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>performFailover</code>&nbsp;in interface&nbsp;<code>org.apache.hadoop.io.retry.FailoverProxyProvider&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;</code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html#performFailover-T-">performFailover</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/ConfiguredFailoverProxyProvider.html" title="class in org.apache.hadoop.hdfs.server.namenode.ha">ConfiguredFailoverProxyProvider</a>&lt;<a href="../../../../../../../org/apache/hadoop/hdfs/server/namenode/ha/RequestHedgingProxyProvider.html" title="type parameter in RequestHedgingProxyProvider">T</a>&gt;</code></dd>
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