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

Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

1260

What is the Hadoop MapReduce API contract for a key and value Class?

1350

Explain the Reducer's Sort phase?

926

What can be optimum value for Reducer?

1003

When is the reducers are started in a MapReduce job?

918

What is the input type/format in MapReduce by default?

1124

What is the default value of map and reduce max attempts?

972

What is the Reducer used for?

978

What comes in Hadoop 2.0 and MapReduce V2 YARN

1046

Why comparison of types is important for MapReduce?

1005

What is the InputSplit in map reduce ?

1075

In which scenario Pig is better fit than MapReduce?

877

What do you mean by a bag in Pig?

1032

Different running modes for running Pig?

925

What are different modes of execution in Apache Pig?

918

Un-Answered Questions { Hadoop }

What is a secondary namenode?

673

Why do we perform partitioning in Hive?

792

Name three features of using Apache Spark

300

What is namenode?

518

Is nosql follow relational db model?

504

List commonly used machine learning algorithm?

300

Explain the input type/format in mapreduce by default?

622

What do you understand by column family?

100

What is a distributed cache in mapreduce framework?

660

What is the inputsplit in map reduce software?

674

Explain Catalyst framework?

373

Difference between Sqoop and Cassandra?

What do you mean by a bag in Pig?

1032

what is Bloom Filter is used for in Cassandra?

118

Does spark run mapreduce?

316

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