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<dd><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a>, <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a></dd>
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<dd><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">CachedDNSToSwitchMapping</a></dd>
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<pre>@InterfaceAudience.Public
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@InterfaceStability.Evolving
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public abstract class <span class="typeNameLabel">AbstractDNSToSwitchMapping</span>
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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>
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implements <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a>, <a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></pre>
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<div class="block">This is a base class for DNS to Switch mappings. <p> It is not mandatory to
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derive <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net"><code>DNSToSwitchMapping</code></a> implementations from it, but it is strongly
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recommended, as it makes it easy for the Hadoop developers to add new methods
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to this base class that are automatically picked up by all implementations.
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<p>
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This class does not extend the <code>Configured</code>
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base class, and should not be changed to do so, as it causes problems
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for subclasses. The constructor of the <code>Configured</code> calls
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the <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#setConf-org.apache.hadoop.conf.Configuration-"><code>setConf(Configuration)</code></a> method, which will call into the
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<td class="colFirst"><code>protected </code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#AbstractDNSToSwitchMapping--">AbstractDNSToSwitchMapping</a></span>()</code>
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<div class="block">Create an unconfigured instance</div>
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<td class="colFirst"><code>protected </code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#AbstractDNSToSwitchMapping-org.apache.hadoop.conf.Configuration-">AbstractDNSToSwitchMapping</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code>
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<div class="block">Create an instance, caching the configuration file.</div>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code><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>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#dumpTopology--">dumpTopology</a></span>()</code>
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<div class="block">Generate a string listing the switch mapping implementation,
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the mapping for every known node and the number of nodes and
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unique switches known about -each entry to a separate line.</div>
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</td>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code><a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getConf--">getConf</a></span>()</code>
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<div class="block">Return the configuration used by this object.</div>
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</td>
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<tr id="i2" class="altColor">
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<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><<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>,<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>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getSwitchMap--">getSwitchMap</a></span>()</code>
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<div class="block">Get a copy of the map (for diagnostics)</div>
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</td>
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<tr id="i3" class="rowColor">
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<td class="colFirst"><code>static boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isMappingSingleSwitch-org.apache.hadoop.net.DNSToSwitchMapping-">isMappingSingleSwitch</a></span>(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> mapping)</code>
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<div class="block">Query for a <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net"><code>DNSToSwitchMapping</code></a> instance being on a single
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switch.</div>
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</td>
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<tr id="i4" class="altColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitch--">isSingleSwitch</a></span>()</code>
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<div class="block">Predicate that indicates that the switch mapping is known to be
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single-switch.</div>
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</td>
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<tr id="i5" class="rowColor">
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<td class="colFirst"><code>protected boolean</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitchByScriptPolicy--">isSingleSwitchByScriptPolicy</a></span>()</code> </td>
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</tr>
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<tr id="i6" class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code>
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<div class="block">Set the configuration to be used by this object.</div>
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<h3>Methods inherited from interface org.apache.hadoop.net.<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a></h3>
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<code><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings--">reloadCachedMappings</a>, <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings-java.util.List-">reloadCachedMappings</a>, <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#resolve-java.util.List-">resolve</a></code></li>
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<h4>AbstractDNSToSwitchMapping</h4>
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<pre>protected AbstractDNSToSwitchMapping()</pre>
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<div class="block">Create an unconfigured instance</div>
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</li>
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<h4>AbstractDNSToSwitchMapping</h4>
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<pre>protected AbstractDNSToSwitchMapping(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre>
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<div class="block">Create an instance, caching the configuration file.
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This constructor does not call <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#setConf-org.apache.hadoop.conf.Configuration-"><code>setConf(Configuration)</code></a>; if
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a subclass extracts information in that method, it must call it explicitly.</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>conf</code> - the configuration</dd>
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</dl>
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<a name="getConf--">
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<h4>getConf</h4>
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<pre>public <a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> getConf()</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">Configurable</a></code></span></div>
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<div class="block">Return the configuration used by this object.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a></code> in interface <code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>Configuration</dd>
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</dl>
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<a name="setConf-org.apache.hadoop.conf.Configuration-">
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<h4>setConf</h4>
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<pre>public void setConf(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">Configurable</a></code></span></div>
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<div class="block">Set the configuration to be used by this object.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code> in interface <code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>conf</code> - configuration to be used</dd>
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<h4>isSingleSwitch</h4>
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<pre>public boolean isSingleSwitch()</pre>
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<div class="block">Predicate that indicates that the switch mapping is known to be
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single-switch. The base class returns false: it assumes all mappings are
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multi-rack. Subclasses may override this with methods that are more aware
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of their topologies.
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<p>
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This method is used when parts of Hadoop need know whether to apply
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single rack vs multi-rack policies, such as during block placement.
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Such algorithms behave differently if they are on multi-switch systems.
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</p></div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>true if the mapping thinks that it is on a single switch</dd>
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</dl>
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<h4>getSwitchMap</h4>
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<pre>public <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><<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>,<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>> getSwitchMap()</pre>
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<div class="block">Get a copy of the map (for diagnostics)</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>a clone of the map or null for none known</dd>
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</dl>
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</li>
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<a name="dumpTopology--">
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<h4>dumpTopology</h4>
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<pre>public <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> dumpTopology()</pre>
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<div class="block">Generate a string listing the switch mapping implementation,
|
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the mapping for every known node and the number of nodes and
|
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unique switches known about -each entry to a separate line.</div>
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<dl>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>a string that can be presented to the ops team or used in
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debug messages.</dd>
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</dl>
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</li>
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<h4>isSingleSwitchByScriptPolicy</h4>
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<pre>protected boolean isSingleSwitchByScriptPolicy()</pre>
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</li>
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<a name="isMappingSingleSwitch-org.apache.hadoop.net.DNSToSwitchMapping-">
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<h4>isMappingSingleSwitch</h4>
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<pre>public static boolean isMappingSingleSwitch(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> mapping)</pre>
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<div class="block">Query for a <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net"><code>DNSToSwitchMapping</code></a> instance being on a single
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switch.
|
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<p>
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This predicate simply assumes that all mappings not derived from
|
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this class are multi-switch.</div>
|
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
|
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<dd><code>mapping</code> - the mapping to query</dd>
|
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<dt><span class="returnLabel">Returns:</span></dt>
|
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<dd>true if the base class says it is single switch, or the mapping
|
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is not derived from this class.</dd>
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