THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
Nutch 0.9 is delivered with hadoop hdfs deactivated by default, so this article does not apply.
To start with nutch 0.8 or to crawl intranets it might be a good idea to run nutch the simple way: without the hadoop distributed virtual filesystem.
The easiest way to achieve this is to edit your hadoop-default.xml file:
<property>
<name>fs.hdfs.impl</name>
<value>org.apache.hadoop.fs.LocalFileSystem</value>
<!-<value>org.apache.hadoop.dfs.DistributedFileSystem</value>->
</property>