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 nlineoutputformat?

683

Explain why do we need hadoop?

672

Explain the features of pseudo mode?

707

What do shuffling do?

679

Explain the basic difference between traditional rdbms and hadoop?

660

Explain what if rack 2 and datanode fails?

642

Define a job tracker?

710

Explain the features of fully distributed mode?

629

What are the characteristics of hadoop framework?

670

Explain how can we change the split size if our commodity hardware has less storage space?

654

Explain how is hadoop different from other data processing tools?

733

Define a datanode?

654

Is secondary namenode a substitute to the namenode?

687

What is a secondary namenode?

632

What is unstructured data?

671

Un-Answered Questions { Big Data }

How much is flume worth?

How data or file is written into HDFS?

Whether Pig Latin language is case-sensitive or not?

660

What are the transformations in spark?

285

Mention what is the difference between an rdbms and hadoop?

424

Clarify Memtable?

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

716

Explain the term paired RDD in Apache Spark?

404

How do ‘map’ and ‘reduce’ work?

659

how can you check whether Namenode is working beside using the jps command?

672

What is the problem with small files in Hadoop?

527

Can you tell us how many daemon processes run on a hadoop system?

595

What is the best practice on deciding the number of column families for HBase table?

168

After increasing the replication level, I still see that data is under replicated. What could be wrong?

465

What are the Data types in Pig?

917

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