What are the Secondary NameNode’s functions?

What are the differences between an operational database and a data warehouse?

What role does Apache Hadoop’s distributed cache play?

What is Hadoop’s “Data Locality?”

Define Balancer in HDFS.

Which two messages does NameNode get from DataNode?

Expand on HDFS.

Describe the fundamental idea underlying the Apache Hadoop Framework.

Explain “rack awareness.”

Describe the HDFS Safe mode.