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

How to optimize MapReduce Job?

657

In MapReduce how to change the name of the output file from part-r-00000?

629

In MapReduce Data Flow, when Combiner is called?

659

Differentiate Reducer and Combiner in Hadoop MapReduce?

687

What is the key- value pair in MapReduce?

793

A number of combiners can be changed or not in MapReduce?

655

How to write a custom partitioner for a Hadoop MapReduce job?

657

What is the need of MapReduce in Hadoop?

635

What does a 'MapReduce Partitioner' do?

689

What is the difference between Reducer and Combiner in Hadoop MapReduce?

685

What is Data Locality in Hadoop?

675

What is KeyValueTextInputFormat in Hadoop MapReduce?

815

What is Mapper in Hadoop MapReduce?

745

How to set mappers and reducers for MapReduce jobs?

636

How to sort intermediate output based on values in MapReduce?

660

Un-Answered Questions { Hadoop }

How does HDFS ensure Data Integrity of data blocks stored in HDFS?

What is spark mapvalues?

284

What is a bag in Pig Latin?

867

What are advantages of Spark over MapReduce?

700

Mention how many operational commands in hbase?

290

How to keep HDFS cluster balanced?

1101

What is zeromq?

529

Define partitions in apache spark.

2176

What is the abstraction of Spark Streaming?

263

Explain different transformation on DStream?

284

In how many ways can we use Spark over Hadoop?

326

What is the default file format to import data using Apache Sqoop?

What is the difference between spark and apache spark?

321

What are the two ways to create rdd in spark?

324

Explain what happens in textinformat ?

753

For More Un-Answered { Hadoop } Questions Click Here