Cognizant Hadoop Interview Questions
- What Hadoop components will you use to design a Craiglist based architecture?
- Why cannot you use Java primitive data types in Hadoop MapReduce?
- Can HDFS blocks be broken?
- Does Hadoop replace data warehousing systems?
- How will you protect the data at rest?
- Propose a design to develop a system that can handle ingestion of both periodic data and real-time data.
- 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?
- File could be replicated to 0 Nodes, instead of 1. Have you ever come across this message? What does it mean?
- How do reducers communicate with each other?
- How can you backup file system metadata in Hadoop?
- What do you understand by a straggler in the context of MapReduce
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