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 do you mean by the High Availability of a NameNode in Hadoop HDFS?

How does HDFS ensure Data Integrity of data blocks stored in HDFS?

What is the difference between RDBMS with Hadoop MapReduce?

852

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

713

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

824

What is a Speculative Execution in Hadoop MapReduce?

714

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

713

In MapReduce, ideally how many mappers should be configured on a slave?

713

What counter in Hadoop MapReduce?

702

What is SequenceFileInputFormat in Hadoop MapReduce?

676

How many Mappers run for a MapReduce job in Hadoop?

662

How many Mappers run for a MapReduce job?

664

How do Hadoop MapReduce works?

791

What is a Distributed Cache in Hadoop?

708

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

691

Un-Answered Questions { Big Data }

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

787

What is the difference between Primary, Partition and Cassandra ?

Define "Transformations" in Spark

355

Which command do we use to show the version?

164

Is the following approach correct? Is the sqrt Of Sum Of Sq a valid reducer?

487

What is a record reader?

456

can you explain about configuration files?

how would you modify that solution to only count the number of unique words in all the documents?

1014

How to set which framework would be used to run mapreduce program?

756

What is wal and hlog in hbase?

319

How can a developer utilize hive?

735

Give the data storage units in Cassandra?

What is javardd spark?

388

How to start a kafka server?

664

Which one would you recommend for hbase table design approach – tall-narrow or flat wide?

335

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