I've a Hbase cluster setup with 3 nodes: A NameNode and 2 DataNodes.
The NameNode is a server with 4GB memory and 20GB hard disk while each DataNode has 8GB memory and 100GB hard disk.
I'm using
Apache Hadoop version: 2.7.2 and
Apache Hbase version: 1.2.4
I've seen some people mentioned about a Secondary NameNode.
My questions are,
- What is the impact of not having a Secondary NameNode in my setup?
- Is it possible to use one of the DataNodes as the Secondary NameNode?
- If possible how can I do it? (I inserted only the NameNode in /etc/hadoop/masters file.)