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?

1214

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

1292

Explain the Reducer's Sort phase?

884

What can be optimum value for Reducer?

947

When is the reducers are started in a MapReduce job?

862

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

1070

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

932

What is the Reducer used for?

923

What comes in Hadoop 2.0 and MapReduce V2 YARN

1003

Why comparison of types is important for MapReduce?

956

What is the InputSplit in map reduce ?

1026

In which scenario Pig is better fit than MapReduce?

835

What do you mean by a bag in Pig?

987

Different running modes for running Pig?

890

What are different modes of execution in Apache Pig?

880

Un-Answered Questions { Hadoop }

How many job tracker processes can run on a single Hadoop cluster?

474

Is ambari python clients can be used to make the good use of ambari api’s?

What are the consistency levels for write operations in Cassandra?

Define Spark-SQL?

281

According to IBM, what are the three characteristics of Big Data?

434

Explain how Hive Deserialize and serialize the data?

737

how you can reduce churn in ISR? When does broker leave the ISR?

619

What is javardd?

294

Does google use spark?

279

How Mapper is instantiated in a running job?

993

Can impala do user-defined functions (udfs)?

What are the modes in which Hadoop run?

504

What operations does rdd support?

278

What are the major areas where Ambari helps the system administrators to do?

What are the functionalities of jobtracker?

672

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