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Expand Up @@ -27,7 +27,7 @@ This document does not cover advanced topics such as [Security](./SecureMode.htm
Prerequisites
-------------

* Install Java. See the [Hadoop Wiki](http://wiki.apache.org/hadoop/HadoopJavaVersions) for known good versions.
* Install Java. See the [Hadoop Wiki](https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+Java+Versions) for known good versions.
* Download a stable version of Hadoop from Apache mirrors.

Installation
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Expand Up @@ -39,7 +39,7 @@ $H3 Required Software

Required software for Linux include:

1. Java™ must be installed. Recommended Java versions are described at [HadoopJavaVersions](http://wiki.apache.org/hadoop/HadoopJavaVersions).
1. Java™ must be installed. Recommended Java versions are described at [HadoopJavaVersions](https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+Java+Versions).

2. ssh must be installed and sshd must be running to use the Hadoop scripts that manage remote Hadoop daemons if the optional start and stop scripts are to be used. Additionally, it is recommmended that pdsh also be installed for better ssh resource management.

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