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91org.apache.hadoop.net</FONT>
92<BR>
93Class CachedDNSToSwitchMapping</H2>
94<PRE>
95<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.net.CachedDNSToSwitchMapping</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A></DD>
100</DL>
101<DL>
102<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/hadoop/net/ScriptBasedMapping.html" title="class in org.apache.hadoop.net">ScriptBasedMapping</A></DD>
103</DL>
104<HR>
105<DL>
106<DT><PRE>public class <B>CachedDNSToSwitchMapping</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A></DL>
107</PRE>
108
109<P>
110A cached implementation of DNSToSwitchMapping that takes an
111 raw DNSToSwitchMapping and stores the resolved network location in
112 a cache. The following calls to a resolved network location
113 will get its location from the cache.
114<P>
115
116<P>
117<HR>
118
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130<CODE>protected &nbsp;<A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A></CODE></FONT></TD>
131<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#rawMapping">rawMapping</A></B></CODE>
132
133<BR>
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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144<B>Constructor Summary</B></FONT></TH>
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146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#CachedDNSToSwitchMapping(org.apache.hadoop.net.DNSToSwitchMapping)">CachedDNSToSwitchMapping</A></B>(<A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A>&nbsp;rawMapping)</CODE>
148
149<BR>
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160<B>Method Summary</B></FONT></TH>
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164<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&gt;</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/CachedDNSToSwitchMapping.html#resolve(java.util.List)">resolve</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&gt;&nbsp;names)</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Resolves a list of DNS-names/IP-addresses and returns back a list of
169 switch information (network paths).</TD>
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193
194<A NAME="rawMapping"><!-- --></A><H3>
195rawMapping</H3>
196<PRE>
197protected <A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A> <B>rawMapping</B></PRE>
198<DL>
199<DL>
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211</TABLE>
212
213<A NAME="CachedDNSToSwitchMapping(org.apache.hadoop.net.DNSToSwitchMapping)"><!-- --></A><H3>
214CachedDNSToSwitchMapping</H3>
215<PRE>
216public <B>CachedDNSToSwitchMapping</B>(<A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A>&nbsp;rawMapping)</PRE>
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229
230<A NAME="resolve(java.util.List)"><!-- --></A><H3>
231resolve</H3>
232<PRE>
233public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&gt; <B>resolve</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&gt;&nbsp;names)</PRE>
234<DL>
235<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#resolve(java.util.List)">DNSToSwitchMapping</A></CODE></B></DD>
236<DD>Resolves a list of DNS-names/IP-addresses and returns back a list of
237 switch information (network paths). One-to-one correspondence must be
238 maintained between the elements in the lists.
239 Consider an element in the argument list - x.y.com. The switch information
240 that is returned must be a network path of the form /foo/rack,
241 where / is the root, and 'foo' is the switch where 'rack' is connected.
242 Note the hostname/ip-address is not part of the returned path.
243 The network topology of the cluster would determine the number of
244 components in the network path.
245<P>
246<DD><DL>
247<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html#resolve(java.util.List)">resolve</A></CODE> in interface <CODE><A HREF="../../../../org/apache/hadoop/net/DNSToSwitchMapping.html" title="interface in org.apache.hadoop.net">DNSToSwitchMapping</A></CODE></DL>
248</DD>
249<DD><DL>
250
251<DT><B>Returns:</B><DD>list of resolved network paths</DL>
252</DD>
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