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<div class="subTitle">org.apache.hadoop.net</div>
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<h2 title="Class ScriptBasedMapping" class="title">Class ScriptBasedMapping</h2>
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<li><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">org.apache.hadoop.net.AbstractDNSToSwitchMapping</a></li>
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<li><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">org.apache.hadoop.net.CachedDNSToSwitchMapping</a></li>
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<ul class="inheritance">
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<li>org.apache.hadoop.net.ScriptBasedMapping</li>
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<pre>@InterfaceAudience.Public
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@InterfaceStability.Evolving
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public class <span class="typeNameLabel">ScriptBasedMapping</span>
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extends <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">CachedDNSToSwitchMapping</a></pre>
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<div class="block">This class implements the <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net"><code>DNSToSwitchMapping</code></a> interface using a
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script configured via the
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<a href="../../../../org/apache/hadoop/fs/CommonConfigurationKeysPublic.html#NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY"><code>CommonConfigurationKeysPublic.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY</code></a> option.
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<p>
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It contains a static class <code>RawScriptBasedMapping</code> that performs
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the work: reading the configuration parameters, executing any defined
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script, handling errors and such like. The outer
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class extends <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net"><code>CachedDNSToSwitchMapping</code></a> to cache the delegated
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queries.
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<p>
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This DNS mapper's <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#isSingleSwitch--"><code>CachedDNSToSwitchMapping.isSingleSwitch()</code></a> predicate returns
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true if and only if a script is defined.</div>
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<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>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#NO_SCRIPT">NO_SCRIPT</a></span></code>
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<div class="block">Text used in the <a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#toString--"><code>toString()</code></a> method if there is no string
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"no script"</div>
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<h3>Fields inherited from class org.apache.hadoop.net.<a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">CachedDNSToSwitchMapping</a></h3>
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<code><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#rawMapping">rawMapping</a></code></li>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#ScriptBasedMapping--">ScriptBasedMapping</a></span>()</code>
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<div class="block">Create an instance with the default configuration.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#ScriptBasedMapping-org.apache.hadoop.conf.Configuration-">ScriptBasedMapping</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 from the given configuration</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#ScriptBasedMapping-org.apache.hadoop.net.DNSToSwitchMapping-">ScriptBasedMapping</a></span>(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> rawMap)</code>
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<div class="block">Create an instance from the given raw mapping</div>
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</td>
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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/ScriptBasedMapping.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="i1" class="rowColor">
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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/ScriptBasedMapping.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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<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/ScriptBasedMapping.html#toString--">toString</a></span>()</code> </td>
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<h3>Methods inherited from class org.apache.hadoop.net.<a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">CachedDNSToSwitchMapping</a></h3>
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<code><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#getSwitchMap--">getSwitchMap</a>, <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#isSingleSwitch--">isSingleSwitch</a>, <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#reloadCachedMappings--">reloadCachedMappings</a>, <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#reloadCachedMappings-java.util.List-">reloadCachedMappings</a>, <a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#resolve-java.util.List-">resolve</a></code></li>
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<h3>Methods inherited from class org.apache.hadoop.net.<a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></h3>
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<code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#dumpTopology--">dumpTopology</a>, <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isMappingSingleSwitch-org.apache.hadoop.net.DNSToSwitchMapping-">isMappingSingleSwitch</a>, <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitchByScriptPolicy--">isSingleSwitchByScriptPolicy</a></code></li>
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<pre>public static final <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> NO_SCRIPT</pre>
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<div class="block">Text used in the <a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#toString--"><code>toString()</code></a> method if there is no string
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"no script"</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../constant-values.html#org.apache.hadoop.net.ScriptBasedMapping.NO_SCRIPT">Constant Field Values</a></dd>
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</dl>
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</a>
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<h3>Constructor Detail</h3>
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<a name="ScriptBasedMapping--">
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<h4>ScriptBasedMapping</h4>
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<pre>public ScriptBasedMapping()</pre>
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<div class="block">Create an instance with the default configuration.
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<p>
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Calling <a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.html#setConf-org.apache.hadoop.conf.Configuration-"><code>setConf(Configuration)</code></a> will trigger a
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re-evaluation of the configuration settings and so be used to
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set up the mapping script.</div>
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<h4>ScriptBasedMapping</h4>
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<pre>public ScriptBasedMapping(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> rawMap)</pre>
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<div class="block">Create an instance from the given raw mapping</div>
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<dl>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>rawMap</code> - raw DNSTOSwithMapping</dd>
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</dl>
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</li>
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</ul>
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<h4>ScriptBasedMapping</h4>
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<pre>public ScriptBasedMapping(<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 from the given configuration</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> - configuration</dd>
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</dl>
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<h3>Method Detail</h3>
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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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<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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<dd><code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getConf--">getConf</a></code> in class <code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</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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<h4>toString</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> toString()</pre>
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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">Set the configuration to be used by this object..
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<p>
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This will get called in the superclass constructor, so a check is needed
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to ensure that the raw mapping is defined before trying to relaying a null
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configuration.
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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="overrideSpecifyLabel">Overrides:</span></dt>
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<dd><code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code> in class <code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>conf</code> - input Configuration.</dd>
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