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

Big Data Interview Questions

Questions Answers Views Company eMail

Distinguish HDFS Block and Input Unit?

What are the difference between of the “HDFS Block” and “Input Split”?

What happens when two users try to access to the same file in HDFS?

Does the HDFS go wrong? If so, how?

Why is HDFS only suitable for large data sets and not the correct tool to use for many small files?

What happens when two clients try to access the same file on HDFS?

185

What are the different file permissions in the HDFS for files or directory levels?

146

How to read file in HDFS?

When NameNode enter in Safe Mode?

Write command to copy a file from HDFS to linux(local).

How to create directory in HDFS?

How to Delete directory from HDFS?

What are the main features of hdfssite.xml?

Write the command to copy a file from linux to hdfs?

How to copy file from HDFS to local?

Un-Answered Questions { Big Data }

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

635

How to Delete file from HDFS?

Define various running modes of apache spark?

282

Is it possible to create cartesian join between 2 tables, using hive?

681

Is client the end user in HDFS?

978

What is Reducer in Hadoop?

549

What is the work of hive/hcatalog?

749

Wherever (Different Directory) I run the hive query, it creates new metastore_db, please explain the reason for it?

747

I have a row or key cache hit rate of 0.XX123456789 reported by JMX. Is that XX% or 0.XX% ?

What is active and passive NameNode in HDFS?

228

Why do we use ‘filters’ Pig scripts?

613

What is spark etl?

296

What is a block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?

What do you understand by snitches?

How kafka communicate with clients and servers?

520

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