Big Data Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Big Data Interview Questions

Questions Answers Views Company eMail

Why rack awareness algorithm is used in hadoop?

Can you change the block size of hdfs files?

What is an identity mapper and identity reducer?

670

What are the advantages of using mapreduce with hadoop?

646

What do you know about nlineinputformat?

753

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

723

What is the role of recordreader in hadoop mapreduce?

798

What happens when the node running the map task fails before the map output has been sent to the reducer?

703

Define speculative execution?

771

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

716

What are the advantages of using map side join in mapreduce?

705

What is a map side join?

739

What is a combiner and where you should use it?

730

When should you use sequencefileinputformat?

721

What is the purpose of textinputformat?

751

Un-Answered Questions { Big Data }

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

What is your favourite tool in the hadoop ecosystem?

1019

What file systems does spark support?

1802

What is compaction in hbase?

175

What is sc parallelize?

372

What is distributed cache in spark?

368

What MapReduce framework consists of?

1158

What is document store db?

What is inputsplit in hadoop? Explain.

841

What is the difference between hive and spark?

324

Can you explain spark graphx?

305

How Cassandra provide High availability feature?

What is the difference between like and rlike operators in hive?

802

In Map Reduce why map write output to Local Disk instead of HDFS?

959

How to specify more than one directory as input to the MapReduce Job?

754

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