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.

126

Explain cassandra.

Where cassandra stores its data?

What do you mean by cassandra-cqlsh?

What is a mapreduce algorithm?

642

What is mapreduce algorithm?

591

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?

596

Where the mapper's intermediate data will be stored?

639

Which are the methods in the mapper interface?

635

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

643

What do you mean by taskinstance?

750

Un-Answered Questions { Big Data }

Explain the need for MapReduce while programming in Apache Pig?

774

What is the purpose of dfsadmin tool?

1247

What are the use cases of Apache Pig?

798

Does impala support generic jdbc?

what is the typical block size of an HDFS block?

916

Whats is distributed cache in hadoop?

678

What is an "Accumulator"?

283

Explain the functionalities of ganglia in ambari?

Explain countByValue() operation in Apache Spark RDD?

265

Mention what job does the conf class do?

424

what is composite type in cassandra?

What are the actions followed by hadoop?

466

What are the different ways you can use to secure a cluster using Ambari?

Does sqoop use mapreduce?

What is the use of foreach operation in Pig scripts?

594

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