TecMint published part 5 of their Hadoop guide. Here the links to the previous parts: Best Practices for Deploying Hadoop Server on CentOS or RHEL 7 - Part 1, Setting Up Hadoop Pre-requisites and Security Hardening - Part 2, How to Install and Configure Cloudera Manager on CentOS/RHEL 7 - Part 3, and How to Install CDH and Configure Service Placements on CentOS/RHEL 7 - Part 4.
How to Set Up High Availability for Namenode - Part 5
Hadoop has two core components which are HDFS and YARN. HDFS is for storing the Data, YARN is for processing the Data. HDFS is Hadoop Distributed File System, it has Namenode as Master Service
