Hadoop configuration

Extensibility
Teradata Employee

Hadoop configuration

I am at beginner level in Hadoop. I want to know best configuration of hadoop components on multiple nodes i-e in my case there are 4 nodes.

Also want to know the multiple instance of some components ie zookeper and other components in hadoop. 

If I switch off one data node will my data be saved ? 

If I switched off namenode will I transfer to Secondary namenode?

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