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?

755

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

732

Which Sorting algorithm is used in Hadoop MapReduce?

642

What is the need of MapReduce?

692

How to configure the number of the Combiner in MapReduce?

668

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

840

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

794

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

755

Define Writable data types in Hadoop MapReduce?

691

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

757

What is shuffling and sorting in Hadoop MapReduce?

684

Define the Use of MapReduce?

723

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

722

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

737

Explain the process of spilling in MapReduce?

648

Un-Answered Questions { Hadoop }

Whats is distributed cache in hadoop?

717

Which type of data HBase can store?

159

Is apache spark going to replace hadoop?

376

How mahout used with python ?

161

Can you explain clustering in mahout?

How does a client read/write data in HDFS?

Is reduce-only job possible in Hadoop MapReduce?

747

Can MapReduce program be written in any language other than Java?

975

What are the benefits of setting up a local repository?

What are shared variables in spark?

321

Why is Kafka technology significant to use?

557

Explain the top() and takeordered() operation?

350

Why do we use spark?

348

What are different hdfs dfs shell commands to perform copy operation?

1099

Is it necessary to kill the topology while updating the running topology?

627

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