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 combiners are and when you should use a combiner in a mapreduce job?

598

Explain what is “map” and what is "reducer" in hadoop?

644

Explain what does the conf.setmapper class do?

611

Explain what are the basic parameters of a mapper?

804

Mention what is the next step after mapper or maptask?

632

Explain what is shuffling in mapreduce?

627

Explain what is distributed cache in mapreduce framework?

616

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

731

Explain what is the function of mapreduce partitioner?

640

Explain what is heartbeat in hdfs?

Explain what is a difference between an input split and hdfs block?

Explain how indexing in hdfs is done?

Mention what is the best way to copy files between hdfs clusters?

Mention what is the difference between hdfs and nas?

What is a difference between an input split and hdfs block?

Un-Answered Questions { Big Data }

What is a cell in hbase?

179

What will you do when NameNode is down?

1004

What do you mean by Persistence?

318

What does reduce action do?

278

How to change replication factor of files already stored in HDFS?

1003

What are the configuration parameters in the 'MapReduce' program?

671

Can you explain speculative execution?

418

What features from relational databases or hive are not available in impala?

What do you understand by unit and ()in scala?

494

What are the most common OutputFormat in Hadoop?

549

What kinds of impala queries or data are best suited for hbase?

Clarify the NoSQL Database?

What is the Repository?

Is bigger than spark driver maxresultsize?

296

How Cassandra provide High availability feature?

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