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POHadoop on MAC pseudo node : nodename nor servname provided, or not known
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  1. POHadoop on MAC pseudo node : nodename nor servname provided, or not known
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    copied!<p>I am a Hadoop newbie. I installed Hadoop on my MAC using this <a href="http://importantfish.com/how-to-run-hadoop-in-standalone-mode-using-eclipse-on-mac-os-x/">link</a></p> <p>It worked like a charm for me to begin with, but now I hit this problem when I run the same WordCount problem from Eclipse :</p> <pre><code>ERROR security.UserGroupInformation: PriviledgedActionException as:&lt;username&gt; cause:java.net.UnknownHostException: &lt;hostname&gt;: &lt;hostname&gt;: hostname nor servname provided, or not known Exception in thread "main" java.net.UnknownHostException: &lt;hostname&gt;: &lt;hostname&gt;: nodename nor servname provided, or not known at java.net.InetAddress.getLocalHost(InetAddress.java:1466) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:960) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:936) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190) at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:936) at org.apache.hadoop.mapreduce.Job.submit(Job.java:550) at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580) at WordCount.main(WordCount.java:57) Caused by: java.net.UnknownHostException: &lt;hostname&gt;: nodename nor servname provided, or not known at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method) </code></pre> <p>This is how my conf files look :</p> <p><em>core-site.xml:</em></p> <pre><code>&lt;configuration&gt; &lt;property&gt; &lt;name&gt;fs.default.name&lt;/name&gt; &lt;value&gt;hdfs://localhost:9000&lt;/value&gt; &lt;/property&gt; &lt;/configuration&gt; </code></pre> <hr> <p><em>hadoop-env.sh</em></p> <p>Has the following entry, in addition the defaults:</p> <pre><code>export HADOOP_OPTS="-Djava.security.krb5.realm=OX.AC.UK -Djava.security.krb5.kdc=kdc0.ox.ac.uk:kdc1.ox.ac.uk" </code></pre> <hr> <p><em>hdfs-site.xml</em></p> <pre><code>&lt;configuration&gt; &lt;property&gt; &lt;name&gt;dfs.replication&lt;/name&gt; &lt;value&gt;1&lt;/value&gt; &lt;/property&gt; &lt;/configuration&gt; </code></pre> <hr> <p><em>mapred-site.xml</em></p> <pre><code>&lt;configuration&gt; &lt;property&gt; &lt;name&gt;mapred.job.tracker&lt;/name&gt; &lt;value&gt;localhost:9001&lt;/value&gt; &lt;/property&gt; &lt;/configuration&gt; </code></pre> <hr> <p>I also see this in the beginning of the errors:</p> <pre><code>2013-10-11 21:03:08.795 java[7484:1903] Unable to load realm mapping info from SCDynamicStore 13/10/11 21:03:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 13/10/11 21:03:08 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same. 13/10/11 21:03:08 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String). 13/10/11 21:03:08 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-&lt;uname&gt;/mapred/staging/&lt;uname&gt;386844365/.staging/job_local386844365_0001 </code></pre> <p>Can somebody please tell me if I am doing anything wrong ? My program is the same and havent changed the defaults (which used to work)</p> <p>Thanks</p>
 

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