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

Apache Hadoop (394)
MapReduce (354)
Apache Hive (345)
Apache Pig (225)

Apache Ambari (93)
Apache HCatalog (34)
Apache HDFS Hadoop Distributed File System (214)
Apache Kafka (189)

Hadoop Interview Questions

Questions Answers Views Company eMail

How is NFS different from HDFS?

Why is block size large in Hadoop?

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?

183

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

142

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?

Un-Answered Questions { Hadoop }

Differentiate between piglatin and hiveql?

535

What is pig properties?

521

Explain Spark Streaming with Socket?

303

what is SPF?

1473

Specify the different types of tables accessible in hive?

747

Define hadoop archives?

Do we need to install spark in all nodes?

270

What are the different ways of representing data in Spark?

253

How to start kafka server?

548

What does a split do?

593

What does serdes mean in apache kafka?

562

Explain what happens in text format?

536

On what basis name node distribute blocks across the data nodes in HDFS?

Establish the difference between a node, cluster & data centres in Cassandra.

141

Is hive suitable to be used for oltp systems? Why?

748

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