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?

1262

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

1355

Explain the Reducer's Sort phase?

930

What can be optimum value for Reducer?

1005

When is the reducers are started in a MapReduce job?

920

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

1128

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

975

What is the Reducer used for?

982

What comes in Hadoop 2.0 and MapReduce V2 YARN

1050

Why comparison of types is important for MapReduce?

1008

What is the InputSplit in map reduce ?

1079

In which scenario Pig is better fit than MapReduce?

877

What do you mean by a bag in Pig?

1034

Different running modes for running Pig?

927

What are different modes of execution in Apache Pig?

921

Un-Answered Questions { Hadoop }

Tell something about the query language used in Cassandra Database?

How can you launch Spark jobs inside Hadoop MapReduce?

333

Does HDFS allow a client to read a file which is already opened for writing in hadoop?

What is row in hbase?

178

What are Flume events?

What is shark?

299

Give me an example of document database ?

531

How to use Apache Zookeeper command line interface?

1205

List the relational operators in pig.

673

What is MapFile?

1001

What is CTAS Table in Hive?

785

What is sparkContext?

303

What is dag spark?

345

Mention what is the difference between an rdbms and hadoop?

469

What are the various types of shared variable in apache spark?

309

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