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

Hadoop Interview Questions

Questions Answers Views Company eMail

What is the difference between Input Split and an HDFS Block?

What is NameNode and DataNode in HDFS?

Why HDFS stores data using commodity hardware despite the higher chance of failures?

What are file permissions in HDFS and how HDFS check permissions for files or directory?

How data or file is written into HDFS?

What is throughput? How does HDFS get a good throughput?

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

List the various HDFS daemons in HDFS cluster?

What is the difference between NAS and HDFS?

If data is present in HDFS and RF is defined, then how can we change Replication Factor?

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

What is the optimal block size in HDFS?

What do you mean by metadata in HDFS?

Data node block size in HDFS, why 64MB?

What happens if the block in HDFS is corrupted?

Un-Answered Questions { Hadoop }

How to resolve ioexception: cannot create directory, while formatting namenode in hadoop?

770

What are the relation operations in Pig? Explain any two with examples?

759

What is a dstream in apache spark?

2049

Name some internal daemons used in spark?

379

What are the options-process for upgrading zookeeper?

Mention what is the maximum size of the message does kafka server can receive?

573

What is difference between Column and Super Column?

What are the modes in which Apache Hadoop run?

840

What is a partition in Hive?

954

What happens when the node running the map task fails before the map output has been sent to the reducer?

697

Does kafka use hdfs?

529

what is composite type in cassandra?

Explain hdfs?

On which port does ssh work?

790

What are input format, input split & record reader and what they do?

671

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