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 slaves limited to 4000 in hadoop version 1?

487

What is heartbeat in hadoop?

426

Explain small file problem in hadoop

421

How to create the directory when name node is in safe mode?

547

Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

449

Ideally what should be the block size in hadoop?

461

What happen when namenode enters in safemode in hadoop?

431

What is shuffleing in mapreduce?

648

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

679

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

826

Describe what happens to a mapreduce job from submission to output?

667

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?

712

What are mapreduce new and old apis while writing map reduce program?. Explain how it works

656

Give some points of pig for hadoop ?

555

How does master slave architecture in the hadoop?

815

Un-Answered Questions { Big Data }

Can you define rdd lineage?

278

Explain HCatReader?

If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

451

Define HDFS and talk about their respective components?

What is fluming?

161

What is sqoop in Hadoop ?

684

Explain avrostorage function?

628

Differentiate between static and dynamic cql tables.

What is the sequencefileinputformat in hadoop?

713

What is the Use of Cassandra Database ?

Did edmond berger invent the spark plug?

377

How can one copy a file into HDFS with a different block size to that of existing block size configuration?

Define a daemon?

669

What is the full form of fsck?

702

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

595

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