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 command to change the replication factor ?

509

What is JobTracker?

441

How many datanodes can run on a single Hadoop cluster?

458

What are some typical functions of Job Tracker?

433

What is TaskTracker?

489

Give a brief overview of Hadoop history?

422

How Big is ‘Big Data’?

431

How can you set an arbitrary number of mappers to be created for a job in Hadoop?

461

How many job tracker processes can run on a single Hadoop cluster?

479

What are some of the characteristics of Hadoop framework?

444

Where are Hadoop’s configuration files located?

512

Can you give a detailed overview about the Big Data being generated by Facebook?

442

How to remove safemode of namenode forcefully in HDFS?

Who divides the file into Block while storing inside hdfs in hadoop?

What are file permissions in HDFS? how does HDFS check permissions for files/directory?

Un-Answered Questions { Big Data }

What is flume instagram?

Explain what does the conf.setMapper Class do in MapReduce?

661

What are tokens in cassandra?

What is the difference between Cassandra and Hadoop ?

How hdfs is different from traditional file systems?

Explain the hdfs architecture and list the various hdfs daemons in hdfs cluster?

Are there any problems which can only be solved by MapReduce and cannot be solved by PIG? In which kind of scenarios MR jobs will be more useful than PIG?

787

Can you define serde in hive?

685

Explain the Reducer's reduce phase?

1068

How can one write custom record reader?

492

What is the role of a MapReduce partitioner?

815

Define memtable?

What do you understand by Lazy Evaluation?

376

What are the limitations of Spark?

294

What do you mean by “data centre” in cassandra?

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