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

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?

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?

Un-Answered Questions { Hadoop }

Is it necessary to start Hadoop to run any Apache Spark Application ?

280

Replication causes data redundancy then why is is pursued in HDFS?

What is apache mahout?

What do you know about Partition in Kafka?

659

Does the archiving of hive tables give any space saving in hdfs?

910

Explain how cassandra writes data?

What do you understand by Commit log in Cassandra?

What is heap memory in spark?

265

Is it possible to rename the output file, and if so, how?

463

Name some features of Apache Cassandra?

What does ambari shell can provide?

Explain the input type/format in mapreduce by default?

579

What is lineage graph?

460

What is a Task instance in Hadoop? Where does it run?1

853

How does pipe operation writes the result to standard output in Apache Spark?

365

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