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?

752

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

729

Which Sorting algorithm is used in Hadoop MapReduce?

640

What is the need of MapReduce?

690

How to configure the number of the Combiner in MapReduce?

667

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

837

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

790

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

754

Define Writable data types in Hadoop MapReduce?

687

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

755

What is shuffling and sorting in Hadoop MapReduce?

681

Define the Use of MapReduce?

722

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

720

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

734

Explain the process of spilling in MapReduce?

647

Un-Answered Questions { Hadoop }

Explain HCatStorer APIs?

What are the relational operators available related to Grouping and joining in Pig language?

518

Define hadoop archives? What is the command for archiving a group of files in hdfs.

What is pre-requisites for contributing to apache mahout ?

What is the usage of foreach operation in Pig scripts?

911

What is salary of hadoop developer?

734

Explain various level of persistence in Apache Spark?

316

How tables are managed in apache tajo?

Clarify how hive de-serialize and serialize the information?

689

How will you connect Apache Spark with Apache Mesos?

284

What is mapreduce algorithm?

642

How Hive distributes the rows into buckets?

849

Compare Hadoop and RDBMS?

452

Explain about the different types of transformations on DStreams?

406

Explain Zero Consistency?

108

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