Preparing each Node

Defines minimum requirements for each node in your cluster.

Every node contributes to the cluster, so each node must be able to run MapR and Hadoop software. Nodes must meet minimum requirements for operating system, memory and disk resources and installed software, such as Java. Including unsuitable nodes in a cluster is a major source of installation difficulty.

Table 1. Node Requirements
Component Requirements
CPU 64-bit x86
OS RedHat, Oracle Linux, CentOS, SUSE, or Ubuntu
Memory 16 GB minimum, more in production
Disk Raw, unformatted drives and no partitions
DNS Hostname, reaches all other nodes
Users Common users across all nodes; passwordless ssh (optional)
Java Must run Java 1.8
Other NTP, Syslog, PAM
Tip: For enhanced node performance and reliability, always set the MAPR_SUBNETS enivronment variable.

Use the subsequent sections as a checklist to make each candidate node suitable for its assigned roles. Install MapR software on each node that you identify as meeting the minimum requirements.