Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

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How one can change Replication factor when Data is already stored in HDFS

Explain HDFS “Write once Read many” pattern?

Why is block size set to 128 MB in HDFS?

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

What is the importance of dfs.namenode.name.dir in HDFS?

How one can format Hadoop HDFS?

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

How to format the HDFS? How frequently it will be done?

Which one is the master node in HDFS? Can it be commodity hardware?

What happens if the block on Hadoop HDFS is corrupted?

What is a block in HDFS, why block size 64MB?

How NameNode tackle Datanode failures in HDFS?

How is indexing done in Hadoop HDFS?

How to perform the inter-cluster data copying work in HDFS?

What are the main properties of hdfs-site.xml file?

Un-Answered Questions { Big Data }

Please explain the sparse vector in Spark.

282

Can you explain apache spark?

322

What do you mean by Thrift in Cassandra?

What is REST?

247

What is apache spark and what is it used for?

328

What is Rack Awareness? What is its need in Hadoop?

532

What is big data in dbms?

600

What is the primary purpose of sqoop in the hadoop architecture?

What are best features of Apache Avro?

What is coarsegrainedexecutorbackend?

289

What are the functionalities of jobtracer?

410

What is apache spark used for?

307

How the read operation is performed on Cassandra node ?

102

Explain about the different types of trformations on dstreams?

302

What is tungsten engine in spark?

318

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