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.

132

Explain cassandra.

Where cassandra stores its data?

What do you mean by cassandra-cqlsh?

What is a mapreduce algorithm?

710

What is mapreduce algorithm?

644

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?

657

Where the mapper's intermediate data will be stored?

686

Which are the methods in the mapper interface?

690

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

697

What do you mean by taskinstance?

802

Un-Answered Questions { Big Data }

Explain how Hive Deserialize and serialize the data?

787

What is mllib?

296

Is it possible to provide multiple input to Hadoop? If yes then how?

555

Why do we need a password-less ssh in fully distributed environment?

762

What is the key difference between NameNode and DataNode in Hadoop?

537

Explain how HDFS communicates with Linux native file system?

What is the difference between an inputsplit and a block?

687

Can you explain logistic regression?

471

What are the relational operators available related to loading and storing in pig language?

666

Explain about the execution pl of a pig script?
or
differentiate between the logical and physical plan of an apache pig script?

548

Define the consistency levels for read operations in Cassandra?

What problem does Apache Flume solve?

101

What are the uses and applications of mahout ?

What is the use of coordinator node in read?

What are Paired RDD?

331

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