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

What are the functions of NameNode?

1 1990

How to configure hadoop to reuse JVM for mappers?

1201

mapper or reducer?

996

How to resolve IOException: Cannot create directory

1016

Does Pig support multi-line commands?

897

How to change replication factor of files already stored in HDFS?

1003

Which one is default InputFormat in Hadoop ?

1 2346

shouldn't DFS be able to handle large volumes of data already?

1067

What is Apache Pig?

816

what is a datanode?

923

How does NameNode tackle DataNode failures?

1169

What is InputSplit and RecordReader?

960

What is the purpose of dfsadmin tool?

1246

How can you connect an application

1028

What are combiners? When should I use a combiner in my MapReduce Job?

901

Un-Answered Questions { Hadoop }

What are consumers or users?

615

What is apache spark for beginners?

287

What are the different tools used for Ambari monitoring purpose?

Explain what is “map” and what is "reducer" in hadoop?

644

What is the use of expand cqlsh command in Cassandra?

What is the jobtracker and what it performs in a hadoop cluster?

637

How do I use spark with big data?

299

Why do we need indexing?

713

What do you mean by logging in cassandra?

Can you define serde in hive?

672

What is coalesce in spark sql?

311

Why spark is faster than hive?

303

What is a spark shuffle?

334

Who divides the file into Block while storing inside hdfs in hadoop?

What happens if the number of reducers is 0 in Hadoop?

481

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