5. Installing Apache Hadoop YARN

A cluster-wide installation of Hadoop 2 YARN is necessary to harness the parallel processing capability of the Hadoop ecosystem. HDFS and YARN form the core components of Hadoop version 2. The familiar MapReduce process is still part of YARN, but it has become its own application framework. The installation methods described in this chapter enable you to fully install the base components needed for YARN functionality. Recall that in YARN, the JobTracker has been replaced by the ResourceManager and the per-node TaskTrackers have been replaced by the NodeManager. The basic HDFS installation using a NameNode and DataNodes remains unchanged.

We describe two methods of installation here: a script-based install and ...

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