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?

995

How to resolve IOException: Cannot create directory

1015

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 2345

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?

1168

What is InputSplit and RecordReader?

959

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 mapreduce new and old apis while writing map reduce program?. Explain how it works

651

Explain about the different complex data types in Pig?

652

Explain Reliability and Failure Handling in Apache Flume?

106

In a very huge text file, you want to just check if a particular keyword exists. How would you do this using Spark?

404

Define the consistency levels for read operations in Cassandra?

What is the core of the job in MapReduce framework?

849

Define data centre?

110

Can multiple clients write into an HDFS file concurrently in hadoop?

What is the row key?

157

How to specify more than one directory as input to the MapReduce Job?

697

Does google use hadoop?

672

What do sorting and shuffling do?

696

List the advantage of Parquet files?

301

What do you mean by metadata in HDFS?

What is graph db?

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