What occurs if a user submits a new job when NameNode is down?

What are the Secondary NameNode’s functions?

Explain “rack awareness.”

How do you turn off the HDFS Data Node’s Block Scanner?

List the standard port numbers on which Hadoop’s task tracker, NameNode, and job tracker operate.

What does FIFO entail?

What is big data?

What does Hadoop’s Heartbeat mean?

How can you achieve security in Hadoop?

Describe the distributed Hadoop file system.