In this recipe, we look to configure Namenode high availability using Journal nodes, ZooKeeper, and ZooKeeper failover controller (ZKFC). This is an automatic failover, rather than the manual one discussed previously.
Before going through the recipes in this chapter, make sure you have two nodes that can be used as Namenodes. The following steps will guide you through the process of setting up Namenode HA using the Journal node.
The role of the Journal node is to keep the Namenodes in sync and prevent split brain. Journal nodes are distributed systems for storing edits.
master2. Both of these ...