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?

864

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?

957

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 }

Explain what is the role of the zookeeper?

490

What type of data hadoop can handle ?

425

What is Rack Awareness? What is its need in Hadoop?

532

Is it possible to use same metastore by multiple users, in case of embedded hive?

659

What are the three layers where the hadoop components are actually supported by ambari?

How the SSTable is different from other relational tables?

While loading data into a hive table using the load data clause, how do you specify it is a hdfs file and not a local file ?

734

What are the particular functionalities of Ganglia in Ambari?

Can I run Apache Spark without Hadoop?

291

What is a "Parquet" in Spark?

316

what is the default replication factor in HDFS?

1017

What happens to existing data in my cluster when I add new nodes?

230

Hadoop sqoop is which type of tool?

How does job tracker schedule a job for the task tracker?

454

Explain the difference between nas and hdfs?

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