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7DNS (Hadoop 0.20.1 API)
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91org.apache.hadoop.net</FONT>
92<BR>
93Class DNS</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.DNS</B>
97</PRE>
98<HR>
99<DL>
100<DT><PRE>public class <B>DNS</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></DL>
101</PRE>
102
103<P>
104A class that provides direct and reverse lookup functionalities, allowing
105 the querying of specific network interfaces or nameservers.
106<P>
107
108<P>
109<HR>
110
111<P>
112
113<!-- ======== CONSTRUCTOR SUMMARY ======== -->
114
115<A NAME="constructor_summary"><!-- --></A>
116<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
117<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
118<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
119<B>Constructor Summary</B></FONT></TH>
120</TR>
121<TR BGCOLOR="white" CLASS="TableRowColor">
122<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#DNS()">DNS</A></B>()</CODE>
123
124<BR>
125&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
126</TR>
127</TABLE>
128&nbsp;
129<!-- ========== METHOD SUMMARY =========== -->
130
131<A NAME="method_summary"><!-- --></A>
132<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
133<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
134<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
135<B>Method Summary</B></FONT></TH>
136</TR>
137<TR BGCOLOR="white" CLASS="TableRowColor">
138<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
139<CODE>static&nbsp;<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></CODE></FONT></TD>
140<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getDefaultHost(java.lang.String)">getDefaultHost</A></B>(<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>&nbsp;strInterface)</CODE>
141
142<BR>
143&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the default (first) host name associated by the default
144 nameserver with the address bound to the specified network interface</TD>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
148<CODE>static&nbsp;<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></CODE></FONT></TD>
149<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getDefaultHost(java.lang.String, java.lang.String)">getDefaultHost</A></B>(<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>&nbsp;strInterface,
150               <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>&nbsp;nameserver)</CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the default (first) host name associated by the provided
154 nameserver with the address bound to the specified network interface</TD>
155</TR>
156<TR BGCOLOR="white" CLASS="TableRowColor">
157<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
158<CODE>static&nbsp;<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></CODE></FONT></TD>
159<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getDefaultIP(java.lang.String)">getDefaultIP</A></B>(<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>&nbsp;strInterface)</CODE>
160
161<BR>
162&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the first available IP address associated with the provided
163 network interface</TD>
164</TR>
165<TR BGCOLOR="white" CLASS="TableRowColor">
166<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
167<CODE>static&nbsp;<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>[]</CODE></FONT></TD>
168<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getHosts(java.lang.String)">getHosts</A></B>(<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>&nbsp;strInterface)</CODE>
169
170<BR>
171&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all the host names associated by the default nameserver with the
172 address bound to the specified network interface</TD>
173</TR>
174<TR BGCOLOR="white" CLASS="TableRowColor">
175<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
176<CODE>static&nbsp;<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>[]</CODE></FONT></TD>
177<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getHosts(java.lang.String, java.lang.String)">getHosts</A></B>(<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>&nbsp;strInterface,
178         <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>&nbsp;nameserver)</CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all the host names associated by the provided nameserver with the
182 address bound to the specified network interface</TD>
183</TR>
184<TR BGCOLOR="white" CLASS="TableRowColor">
185<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186<CODE>static&nbsp;<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>[]</CODE></FONT></TD>
187<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#getIPs(java.lang.String)">getIPs</A></B>(<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>&nbsp;strInterface)</CODE>
188
189<BR>
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns all the IPs associated with the provided interface, if any, in
191 textual form.</TD>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
195<CODE>static&nbsp;<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></CODE></FONT></TD>
196<TD><CODE><B><A HREF="../../../../org/apache/hadoop/net/DNS.html#reverseDns(java.net.InetAddress, java.lang.String)">reverseDns</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A>&nbsp;hostIp,
197           <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>&nbsp;ns)</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the hostname associated with the specified IP address by the
201 provided nameserver.</TD>
202</TR>
203</TABLE>
204&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
205<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
206<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
207<TH ALIGN="left"><B>Methods inherited from class java.lang.<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></B></TH>
208</TR>
209<TR BGCOLOR="white" CLASS="TableRowColor">
210<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
211</TR>
212</TABLE>
213&nbsp;
214<P>
215
216<!-- ========= CONSTRUCTOR DETAIL ======== -->
217
218<A NAME="constructor_detail"><!-- --></A>
219<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
220<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
221<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
222<B>Constructor Detail</B></FONT></TH>
223</TR>
224</TABLE>
225
226<A NAME="DNS()"><!-- --></A><H3>
227DNS</H3>
228<PRE>
229public <B>DNS</B>()</PRE>
230<DL>
231</DL>
232
233<!-- ============ METHOD DETAIL ========== -->
234
235<A NAME="method_detail"><!-- --></A>
236<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
237<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
238<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
239<B>Method Detail</B></FONT></TH>
240</TR>
241</TABLE>
242
243<A NAME="reverseDns(java.net.InetAddress, java.lang.String)"><!-- --></A><H3>
244reverseDns</H3>
245<PRE>
246public static <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> <B>reverseDns</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</A>&nbsp;hostIp,
247                                <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>&nbsp;ns)
248                         throws <A HREF="http://java.sun.com/javase/6/docs/api/javax/naming/NamingException.html?is-external=true" title="class or interface in javax.naming">NamingException</A></PRE>
249<DL>
250<DD>Returns the hostname associated with the specified IP address by the
251 provided nameserver.
252<P>
253<DD><DL>
254<DT><B>Parameters:</B><DD><CODE>hostIp</CODE> - The address to reverse lookup<DD><CODE>ns</CODE> - The host name of a reachable DNS server
255<DT><B>Returns:</B><DD>The host name associated with the provided IP
256<DT><B>Throws:</B>
257<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/javax/naming/NamingException.html?is-external=true" title="class or interface in javax.naming">NamingException</A></CODE> - If a NamingException is encountered</DL>
258</DD>
259</DL>
260<HR>
261
262<A NAME="getIPs(java.lang.String)"><!-- --></A><H3>
263getIPs</H3>
264<PRE>
265public static <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>[] <B>getIPs</B>(<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>&nbsp;strInterface)
266                       throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
267<DL>
268<DD>Returns all the IPs associated with the provided interface, if any, in
269 textual form.
270<P>
271<DD><DL>
272<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)
273<DT><B>Returns:</B><DD>A string vector of all the IPs associated with the provided
274         interface
275<DT><B>Throws:</B>
276<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE> - If an UnknownHostException is encountered in querying the
277             default interface</DL>
278</DD>
279</DL>
280<HR>
281
282<A NAME="getDefaultIP(java.lang.String)"><!-- --></A><H3>
283getDefaultIP</H3>
284<PRE>
285public static <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> <B>getDefaultIP</B>(<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>&nbsp;strInterface)
286                           throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
287<DL>
288<DD>Returns the first available IP address associated with the provided
289 network interface
290<P>
291<DD><DL>
292<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)
293<DT><B>Returns:</B><DD>The IP address in text form
294<DT><B>Throws:</B>
295<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE> - If one is encountered in querying the default interface</DL>
296</DD>
297</DL>
298<HR>
299
300<A NAME="getHosts(java.lang.String, java.lang.String)"><!-- --></A><H3>
301getHosts</H3>
302<PRE>
303public static <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>[] <B>getHosts</B>(<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>&nbsp;strInterface,
304                                <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>&nbsp;nameserver)
305                         throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
306<DL>
307<DD>Returns all the host names associated by the provided nameserver with the
308 address bound to the specified network interface
309<P>
310<DD><DL>
311<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)<DD><CODE>nameserver</CODE> - The DNS host name
312<DT><B>Returns:</B><DD>A string vector of all host names associated with the IPs tied to
313         the specified interface
314<DT><B>Throws:</B>
315<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE></DL>
316</DD>
317</DL>
318<HR>
319
320<A NAME="getHosts(java.lang.String)"><!-- --></A><H3>
321getHosts</H3>
322<PRE>
323public static <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>[] <B>getHosts</B>(<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>&nbsp;strInterface)
324                         throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
325<DL>
326<DD>Returns all the host names associated by the default nameserver with the
327 address bound to the specified network interface
328<P>
329<DD><DL>
330<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)
331<DT><B>Returns:</B><DD>The list of host names associated with IPs bound to the network
332         interface
333<DT><B>Throws:</B>
334<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE> - If one is encountered while querying the deault interface</DL>
335</DD>
336</DL>
337<HR>
338
339<A NAME="getDefaultHost(java.lang.String, java.lang.String)"><!-- --></A><H3>
340getDefaultHost</H3>
341<PRE>
342public static <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> <B>getDefaultHost</B>(<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>&nbsp;strInterface,
343                                    <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>&nbsp;nameserver)
344                             throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
345<DL>
346<DD>Returns the default (first) host name associated by the provided
347 nameserver with the address bound to the specified network interface
348<P>
349<DD><DL>
350<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)<DD><CODE>nameserver</CODE> - The DNS host name
351<DT><B>Returns:</B><DD>The default host names associated with IPs bound to the network
352         interface
353<DT><B>Throws:</B>
354<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE> - If one is encountered while querying the deault interface</DL>
355</DD>
356</DL>
357<HR>
358
359<A NAME="getDefaultHost(java.lang.String)"><!-- --></A><H3>
360getDefaultHost</H3>
361<PRE>
362public static <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> <B>getDefaultHost</B>(<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>&nbsp;strInterface)
363                             throws <A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></PRE>
364<DL>
365<DD>Returns the default (first) host name associated by the default
366 nameserver with the address bound to the specified network interface
367<P>
368<DD><DL>
369<DT><B>Parameters:</B><DD><CODE>strInterface</CODE> - The name of the network interface to query (e.g. eth0)
370<DT><B>Returns:</B><DD>The default host name associated with IPs bound to the network
371         interface
372<DT><B>Throws:</B>
373<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</A></CODE> - If one is encountered while querying the deault interface</DL>
374</DD>
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