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?

1187

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

1255

Explain the Reducer's Sort phase?

851

What can be optimum value for Reducer?

916

When is the reducers are started in a MapReduce job?

835

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

1049

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

901

What is the Reducer used for?

893

What comes in Hadoop 2.0 and MapReduce V2 YARN

973

Why comparison of types is important for MapReduce?

924

What is the InputSplit in map reduce ?

998

In which scenario Pig is better fit than MapReduce?

797

What do you mean by a bag in Pig?

947

Different running modes for running Pig?

866

What are different modes of execution in Apache Pig?

844

Un-Answered Questions { Hadoop }

How does reducebykey work in spark?

247

How can I restart namenode?

673

What are the various libraries available on top of Apache Spark?

296

Is kafka part of hadoop?

475

Explain mappartitions() and mappartitionswithindex()?

416

What is closing out ledgers?

Give me an example of document database ?

438

What is the function of "MLlib"?

294

What kind of datawarehouse application is suitable for Hive?

654

What is the message broker?

450

How data transfer happens from HDFS to Hive?

771

How to set property in apache tajo?

What Mapper does?

950

What is the role of recordreader in hadoop mapreduce?

707

How can the columns of a table in hive be written to a file?

679

For More Un-Answered { Hadoop } Questions Click Here