[Lucene-hadoop Wiki] Update of "GettingStartedWithHadoop" by NigelDaley

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The following page has been changed by NigelDaley:
http://wiki.apache.org/lucene-hadoop/GettingStartedWithHadoop

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  The {{{$HADOOP_INSTALL/hadoop/conf}}} directory contains some configuration files for Hadoop. These are:
  
-  * {{{hadoop-env.sh}}} - This file contains some environment variable settings used by Hadoop. You can use these to affect some aspects of Hadoop daemon behavior, such as where log files are stored, the maximum amount of heap used etc. The only variable you should need to change in this file is {{{JAVA_HOME}}}, which specifies the path to the Java installation used by Hadoop.
+  * {{{hadoop-env.sh}}} - This file contains some environment variable settings used by Hadoop. You can use these to affect some aspects of Hadoop daemon behavior, such as where log files are stored, the maximum amount of heap used etc. The only variable you should need to change in this file is {{{JAVA_HOME}}}, which specifies the path to the Java 1.5.x installation used by Hadoop.
   * {{{slaves}}} - This file lists the hosts, one per line, where the Hadoop slave daemons (datanodes and tasktrackers) will run. By default this contains the single entry {{{localhost}}}
   * {{{hadoop-default.xml}}} - This file contains generic default settings for Hadoop daemons and Map/Reduce jobs. '''Do not modify this file.'''
   * {{{mapred-default.xml}}} - This file contains site specific settings for the Hadoop Map/Reduce daemons and jobs. The file is empty by default. Putting configuration properties in this file will override Map/Reduce settings in the {{{hadoop-default.xml}}} file. Use this file to tailor the behavior of Map/Reduce on your site.