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

Explain map-only job?

526

What is KeyValueTextInputFormat in Hadoop?

529

What happen if number of reducer is set to 0 in Hadoop?

493

What is TextInputFormat in Hadoop?

517

What is purpose of RecordWriter in Hadoop?

509

What are the most common OutputFormat in Hadoop?

549

What is LazyOutputFormat in Hadoop?

495

What is Identity reducer?

522

What is Chain Mapper?

558

What are the core methods of a Reducer?

511

What are the parameters of mappers and reducers?

489

What is the difference between TextinputFormat and KeyValueTextInputFormat class?

508

How is the splitting of file invoked in Hadoop ?

535

How many InputSplits will be made by hadoop framework?

492

Explain the usage of Context Object?

476

Un-Answered Questions { Hadoop }

What are the modules that constitute the Apache Hadoop 2.0 framework?

1006

What causes sparks?

293

Does kafka use hdfs?

498

How can you compare Hadoop and Spark in terms of ease of use?

289

Did you ever ran into a lop sided job that resulted in out of memory error

1220

What is the use of map transformation?

312

What will be the output of cast ('XYZ' as INT)?

687

Can you explain edge nodes in hadoop?

437

What is full form of rdd?

388

What are the features of Standalone (local) mode?

596

What do you know about Partition in Kafka?

659

Can we run unix shell commands from hive? Can hive queries be executed from script files? How? Give an example.

800

When is it suggested to use a combiner in a MapReduce job?

636

What is a Hive variable? What for we use it?

804

How does MapReduce framework view its input internally?

868

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