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

Big Data Interview Questions

Questions Answers Views Company eMail

What is the role of alter keyspace?

What is hadoop, hbase, hive and cassandra? Specify similarities and differences among them.

122

Explain cassandra.

Where cassandra stores its data?

What do you mean by cassandra-cqlsh?

What is a mapreduce algorithm?

587

What is mapreduce algorithm?

560

What is hdfs block size?

How hdfs is different from traditional file systems?

How is hdfs block size different from traditional file system block size?

When the reducers are are started in a mapreduce job?

559

Where the mapper's intermediate data will be stored?

596

Which are the methods in the mapper interface?

589

What is a namenode? How many instances of namenode run on a hadoop cluster?

593

What do you mean by taskinstance?

692

Un-Answered Questions { Big Data }

What operations RDD support?

292

What is Hadoop Distributed File System- HDFS?

What is Thrift?

Is hadoop the future?

603

While writing evaluate UDF, which method has to be overridden?

538

What are the main components of spark?’

301

Explain the use of .mecia class?

738

What kind of datawarehouse application is suitable for Hive?

648

Explain how can you debug hadoop code?

439

What happens if one hadoop client renames a file or a directory containing this file while another client is still writing into it?

422

What is apache spark good for?

270

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

647

What are the problems with Hadoop 1.0?

992

What are the various libraries available on top of Apache Spark?

290

Explain Erasure Coding in Apache Hadoop?

693

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