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| <h2 title="Class CachedDNSToSwitchMapping" class="title">Class CachedDNSToSwitchMapping</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>org.apache.hadoop.net.CachedDNSToSwitchMapping</li> |
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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/ScriptBasedMapping.html" title="class in org.apache.hadoop.net">ScriptBasedMapping</a>, <a href="../../../../org/apache/hadoop/net/TableMapping.html" title="class in org.apache.hadoop.net">TableMapping</a></dd> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class <span class="typeNameLabel">CachedDNSToSwitchMapping</span> |
| extends <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></pre> |
| <div class="block">A cached implementation of DNSToSwitchMapping that takes an |
| raw DNSToSwitchMapping and stores the resolved network location in |
| a cache. The following calls to a resolved network location |
| will get its location from the cache.</div> |
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| <td class="colFirst"><code>protected <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#rawMapping">rawMapping</a></span></code> |
| <div class="block">The uncached mapping</div> |
| </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#CachedDNSToSwitchMapping-org.apache.hadoop.net.DNSToSwitchMapping-">CachedDNSToSwitchMapping</a></span>(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> rawMapping)</code> |
| <div class="block">cache a raw DNS mapping</div> |
| </td> |
| </tr> |
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| <tr id="i0" 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><<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> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#getSwitchMap--">getSwitchMap</a></span>()</code> |
| <div class="block">Get the (host x switch) map.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#isSingleSwitch--">isSingleSwitch</a></span>()</code> |
| <div class="block">Delegate the switch topology query to the raw mapping, via |
| <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isMappingSingleSwitch-org.apache.hadoop.net.DNSToSwitchMapping-"><code>AbstractDNSToSwitchMapping.isMappingSingleSwitch(DNSToSwitchMapping)</code></a></div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#reloadCachedMappings--">reloadCachedMappings</a></span>()</code> |
| <div class="block">Reload all of the cached mappings.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#reloadCachedMappings-java.util.List-">reloadCachedMappings</a></span>(<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><<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>> names)</code> |
| <div class="block">Reload cached mappings on specific nodes.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><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><<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/CachedDNSToSwitchMapping.html#resolve-java.util.List-">resolve</a></span>(<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><<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>> names)</code> |
| <div class="block">Resolves a list of DNS-names/IP-addresses and returns back a list of |
| switch information (network paths).</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <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/CachedDNSToSwitchMapping.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/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></h3> |
| <code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#dumpTopology--">dumpTopology</a>, <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getConf--">getConf</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>, <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</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#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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| <!-- ============ FIELD DETAIL =========== --> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="rawMapping"> |
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| </a> |
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| <h4>rawMapping</h4> |
| <pre>protected final <a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> rawMapping</pre> |
| <div class="block">The uncached mapping</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| <h3>Constructor Detail</h3> |
| <a name="CachedDNSToSwitchMapping-org.apache.hadoop.net.DNSToSwitchMapping-"> |
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| <h4>CachedDNSToSwitchMapping</h4> |
| <pre>public CachedDNSToSwitchMapping(<a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</a> rawMapping)</pre> |
| <div class="block">cache a raw DNS mapping</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rawMapping</code> - the raw mapping to cache</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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| <a name="resolve-java.util.List-"> |
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| <h4>resolve</h4> |
| <pre>public <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><<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>> resolve(<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><<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>> names)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#resolve-java.util.List-">DNSToSwitchMapping</a></code></span></div> |
| <div class="block">Resolves a list of DNS-names/IP-addresses and returns back a list of |
| switch information (network paths). One-to-one correspondence must be |
| maintained between the elements in the lists. |
| Consider an element in the argument list - x.y.com. The switch information |
| that is returned must be a network path of the form /foo/rack, |
| where / is the root, and 'foo' is the switch where 'rack' is connected. |
| Note the hostname/ip-address is not part of the returned path. |
| The network topology of the cluster would determine the number of |
| components in the network path. |
| <p> |
| |
| If a name cannot be resolved to a rack, the implementation |
| should return <code>NetworkTopology.DEFAULT_RACK</code>. This |
| is what the bundled implementations do, though it is not a formal requirement</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>names</code> - the list of hosts to resolve (can be empty)</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>list of resolved network paths. |
| If <i>names</i> is empty, the returned list is also empty</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSwitchMap--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSwitchMap</h4> |
| <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> |
| <div class="block">Get the (host x switch) map.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#getSwitchMap--">getSwitchMap</a></code> in class <code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a copy of the cached map of hosts to rack</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="toString--"> |
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| <h4>toString</h4> |
| <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> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><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></code> in class <code><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></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isSingleSwitch--"> |
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| <h4>isSingleSwitch</h4> |
| <pre>public boolean isSingleSwitch()</pre> |
| <div class="block">Delegate the switch topology query to the raw mapping, via |
| <a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isMappingSingleSwitch-org.apache.hadoop.net.DNSToSwitchMapping-"><code>AbstractDNSToSwitchMapping.isMappingSingleSwitch(DNSToSwitchMapping)</code></a></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html#isSingleSwitch--">isSingleSwitch</a></code> in class <code><a href="../../../../org/apache/hadoop/net/AbstractDNSToSwitchMapping.html" title="class in org.apache.hadoop.net">AbstractDNSToSwitchMapping</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true iff the raw mapper is considered single-switch.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="reloadCachedMappings--"> |
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| </a> |
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| <h4>reloadCachedMappings</h4> |
| <pre>public void reloadCachedMappings()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings--">DNSToSwitchMapping</a></code></span></div> |
| <div class="block">Reload all of the cached mappings. |
| |
| If there is a cache, this method will clear it, so that future accesses |
| will get a chance to see the new data.</div> |
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| <a name="reloadCachedMappings-java.util.List-"> |
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| <h4>reloadCachedMappings</h4> |
| <pre>public void reloadCachedMappings(<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><<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>> names)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings-java.util.List-">DNSToSwitchMapping</a></code></span></div> |
| <div class="block">Reload cached mappings on specific nodes. |
| |
| If there is a cache on these nodes, this method will clear it, so that |
| future accesses will see updated data.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>names</code> - input names.</dd> |
| </dl> |
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