What are the different types of Znodes?

981

What other technologies have you used in hadoop sta ck?

984

How is security achieved in Apache Hadoop?

909

How to Administering Hadoop?

902

Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?

748

What are active and passive "NameNodes"?

1465

Can the balancer be run while Hadoop is in use?

975

What is oozie in hadoop?

672

Explain what if rack 2 and datanode fails?

636

Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

762

How blocks are distributed among all data nodes for a particular chunk of data?

1090

What is a task instance in hadoop? Where does it run?

615

What will be the consideration while we do Hardware Planning for Master in Hadoop architecture?

1075

What are the four characteristics of Big Data?

715

What is the difference between Apache Hadoop and RDBMS?

807