Infosys Hadoop Interview questions
- Why Hadoop? (Compare to RDBMS)
- What would happen if NameNode failed? How do you bring it up?
- What details are in the “fsimage” file?
- What is SecondaryNameNode?
- Explain the MapReduce processing framework? (start to end)
- What is Combiner? Where does it fit and give an example? Preferably from your project.
- What is Partitioner? Why do you need it and give an example? Preferably from your project.
- Oozie – What are the nodes?
- What are the actions in Action Node?
- Explain your Pig project?
- What log file loaders did you use in Pig?
- Hive Joining? What did you join?
- Explain Partitioning & Bucketing (based on your project)?
- Why do we need bucketing?
- Did you write any Hive UDFs?
- Filter – What did you filter out?
- HBase?
- Flume?
- Sqoop?
- Zookeeper?