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?

197

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

159

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 }

Can You Use Apache Spark To Analyze and Access Data Stored In Cassandra Databases?

316

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

754

How data or file is written into Hadoop HDFS?

What is the use of checkpoints in spark?

326

Is it possible to leverage real-time analysis of the big data collected by Flume directly? If yes, then explain how?

148

Explain plucktuple?

617

What are the different modes available in Pig?

605

What is Sqoop Job?

How to write 'foreach' statement for tuple datatype in pig scripts?

657

What is the usage of "void close()" method?

Since the data is replicated thrice in hdfs, does it mean that any calculation done on one node will also be replicated on the other two?

Define Writable data types in MapReduce?

720

Why we need impala hadoop?

What is the use of Combiner?

1029

Differentiate between the physical plan and logical plan in Pig script?

815

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