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<h2 title="Class AbstractDNSToSwitchMapping" class="title">Class AbstractDNSToSwitchMapping</h2>
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<dt>All Implemented Interfaces:</dt>
<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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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">CachedDNSToSwitchMapping</a>, <a href="../../../../org/apache/hadoop/net/ScriptBasedMapping.RawScriptBasedMapping.html" title="class in org.apache.hadoop.net">ScriptBasedMapping.RawScriptBasedMapping</a></dd>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public abstract class <span class="typeNameLabel">AbstractDNSToSwitchMapping</span>
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/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>
<div class="block">This is a base class for DNS to Switch mappings. <p> It is not mandatory to
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
recommended, as it makes it easy for the Hadoop developers to add new methods
to this base class that are automatically picked up by all implementations.
<p>
This class does not extend the <code>Configured</code>
base class, and should not be changed to do so, as it causes problems
for subclasses. The constructor of the <code>Configured</code> calls
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
subclasses before they have been fully constructed.</div>
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<td class="colFirst"><code>protected </code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#AbstractDNSToSwitchMapping--">AbstractDNSToSwitchMapping</a></span>()</code>
<div class="block">Create an unconfigured instance</div>
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<td class="colFirst"><code>protected </code></td>
<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>&nbsp;conf)</code>
<div class="block">Create an instance, caching the configuration file.</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>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#dumpTopology--">dumpTopology</a></span>()</code>
<div class="block">Generate a string listing the switch mapping implementation,
the mapping for every known node and the number of nodes and
unique switches known about -each entry to a separate line.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getConf--">getConf</a></span>()</code>
<div class="block">Return the configuration used by this object.</div>
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<tr id="i2" class="altColor">
<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>&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>,<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/net/AbstractDNSToSwitchMapping.html#getSwitchMap--">getSwitchMap</a></span>()</code>
<div class="block">Get a copy of the map (for diagnostics)</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<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>&nbsp;mapping)</code>
<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
switch.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitch--">isSingleSwitch</a></span>()</code>
<div class="block">Predicate that indicates that the switch mapping is known to be
single-switch.</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitchByScriptPolicy--">isSingleSwitchByScriptPolicy</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<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>&nbsp;conf)</code>
<div class="block">Set the configuration to be used by this object.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.hadoop.net.<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a></h3>
<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>
<pre>protected&nbsp;AbstractDNSToSwitchMapping()</pre>
<div class="block">Create an unconfigured instance</div>
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<h4>AbstractDNSToSwitchMapping</h4>
<pre>protected&nbsp;AbstractDNSToSwitchMapping(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
<div class="block">Create an instance, caching the configuration file.
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
a subclass extracts information in that method, it must call it explicitly.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>conf</code> - the configuration</dd>
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<h4>getConf</h4>
<pre>public&nbsp;<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;getConf()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">Configurable</a></code></span></div>
<div class="block">Return the configuration used by this object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Configuration</dd>
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<h4>setConf</h4>
<pre>public&nbsp;void&nbsp;setConf(<a href="../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a>&nbsp;conf)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">Configurable</a></code></span></div>
<div class="block">Set the configuration to be used by this object.</div>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>conf</code> - configuration to be used</dd>
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<h4>isSingleSwitch</h4>
<pre>public&nbsp;boolean&nbsp;isSingleSwitch()</pre>
<div class="block">Predicate that indicates that the switch mapping is known to be
single-switch. The base class returns false: it assumes all mappings are
multi-rack. Subclasses may override this with methods that are more aware
of their topologies.
<p>
This method is used when parts of Hadoop need know whether to apply
single rack vs multi-rack policies, such as during block placement.
Such algorithms behave differently if they are on multi-switch systems.
</p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the mapping thinks that it is on a single switch</dd>
</dl>
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<h4>getSwitchMap</h4>
<pre>public&nbsp;<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>&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>,<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;&nbsp;getSwitchMap()</pre>
<div class="block">Get a copy of the map (for diagnostics)</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a clone of the map or null for none known</dd>
</dl>
</li>
</ul>
<a name="dumpTopology--">
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<h4>dumpTopology</h4>
<pre>public&nbsp;<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;dumpTopology()</pre>
<div class="block">Generate a string listing the switch mapping implementation,
the mapping for every known node and the number of nodes and
unique switches known about -each entry to a separate line.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a string that can be presented to the ops team or used in
debug messages.</dd>
</dl>
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<pre>protected&nbsp;boolean&nbsp;isSingleSwitchByScriptPolicy()</pre>
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<h4>isMappingSingleSwitch</h4>
<pre>public static&nbsp;boolean&nbsp;isMappingSingleSwitch(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a>&nbsp;mapping)</pre>
<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
switch.
<p>
This predicate simply assumes that all mappings not derived from
this class are multi-switch.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mapping</code> - the mapping to query</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the base class says it is single switch, or the mapping
is not derived from this class.</dd>
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