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

Can we set the number of reducers to zero in MapReduce?

703

Where sorting is done on mapper node or reducer node in MapReduce?

684

Which Sorting algorithm is used in Hadoop MapReduce?

606

What is the need of MapReduce?

636

How to configure the number of the Combiner in MapReduce?

628

How to change a number of mappers running on a slave in MapReduce?

792

Is it mandatory to set input and output type/format in MapReduce?

744

How to set the number of mappers for a MapReduce job?

693

Define Writable data types in Hadoop MapReduce?

645

What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?

708

What is shuffling and sorting in Hadoop MapReduce?

638

Define the Use of MapReduce?

676

Whether the output of mapper or output of partitioner written on local disk?

672

How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

707

Explain the process of spilling in MapReduce?

604

Un-Answered Questions { Hadoop }

What is secondary namenode? Is it a substitute or back up node for the namenode?

Explain the architecture of Hadoop Pig?

762

What is azure spark?

298

What is lambda architecture spark?

319

When NameNode enter in Safe Mode?

What do you mean by consistency in Cassandra?

188

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

498

If there is certain data that we want to use again and again in different transformations, what should improve the performance?

307

What is the use of Bloom Filter in Cassandra?

125

How jobtracker assign tasks to the tasktracker?

420

Why Flume?

180

What is hdfs spark?

287

Name some independent extensions that contribute to the Ambari codebase?

Explain how RDDs work with Scala in Spark

344

What is Spark Driver?

308

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