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| <h2 title="Interface DNSToSwitchMapping" class="title">Interface DNSToSwitchMapping</h2> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public interface <a href="../../../../src-html/org/apache/hadoop/net/DNSToSwitchMapping.html#line.32">DNSToSwitchMapping</a></pre> |
| <div class="block">An interface that must be implemented to allow pluggable |
| DNS-name/IP-address to RackID resolvers.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings()">reloadCachedMappings</a></strong>()</code> |
| <div class="block">Reload all of the cached mappings.</div> |
| </td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#reloadCachedMappings(java.util.List)">reloadCachedMappings</a></strong>(<a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/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> |
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| <td class="colFirst"><code><a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#resolve(java.util.List)">resolve</a></strong>(<a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/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> |
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| <h4>resolve</h4> |
| <pre><a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> <a href="../../../../src-html/org/apache/hadoop/net/DNSToSwitchMapping.html#line.53">resolve</a>(<a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> names)</pre> |
| <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="strong">Parameters:</span></dt><dd><code>names</code> - the list of hosts to resolve (can be empty)</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>list of resolved network paths. |
| If <i>names</i> is empty, the returned list is also empty</dd></dl> |
| </li> |
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| <a name="reloadCachedMappings()"> |
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| <h4>reloadCachedMappings</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/net/DNSToSwitchMapping.html#line.61">reloadCachedMappings</a>()</pre> |
| <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> |
| </li> |
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| <h4>reloadCachedMappings</h4> |
| <pre>void <a href="../../../../src-html/org/apache/hadoop/net/DNSToSwitchMapping.html#line.69">reloadCachedMappings</a>(<a href="http://download.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://download.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>> names)</pre> |
| <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> |
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