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?

195

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

157

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 }

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

Explain what is sqoop in Hadoop ?

775

How NameNode tackle Datanode failures in Hadoop?

512

How can you start a consumer in kafka?

577

How do you handle compression in pig?

603

What combiners is and when you should use a combiner in a MapReduce Job?

674

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

Why do we need spark?

294

What is dataframe api?

336

Explain Cqlsh?

What is spark driver application?

281

What is meant by in-memory processing in Spark?

323

What is a bag in pig?

676

Does spark use yarn?

270

What is your favourite tool in the hadoop ecosystem?

1008

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