Cognizant - Hadoop Interview Questions
- How will you protect the data at rest?
- Why cannot you use Java primitive data types in Hadoop MapReduce?
- What do you understand by a straggler in the context of MapReduce?
- A folder contains 10000 files with each file having size greater than 3GB.The files contain users, their names and date. How will you get the count of all the unique users from 10000 files using Hadoop?
- Propose a design to develop a system that can handle ingestion of both periodic data and real-time data.
- How can you backup file system metadata in Hadoop?
- Which object will you use to track the progress of a job?
- What is the difference between data and big data?
- Can we export a partitioned table to RDBMS?
- How to skip header rows from a table in Hive?
