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

What is a Distributed Cache in Hadoop?

669

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

642

What is the problem with the small file in Hadoop?

653

How many Reducers run for a MapReduce job?

698

How to specify more than one directory as input to the MapReduce Job?

699

How to set the number of mappers to be created in MapReduce?

642

What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?

853

What is Reducer in MapReduce?

736

How many Reducers run for a MapReduce job in Hadoop?

590

What is MapReduce in Hadoop?

648

Why Hadoop MapReduce?

671

Why can aggregation not be done in Mapper in MapReduce?

616

How to submit extra files(jars, static files) for MapReduce job during runtime?

679

How many numbers of reducers run in Map-Reduce Job?

610

What is MapReduce? What are the syntax you use to run a MapReduce program?

676

Un-Answered Questions { Hadoop }

How to debug Hadoop code?

540

What is Fault Tolerance?

539

What is spark shuffle service?

338

Can you tell us more about ssh?

733

What are Flume core components?

Define the Use of Pig?

555

Explain bagtostring in pig?

556

Explain tobag function?

561

What is pagerank in graphx?

284

What is pseudo-distributed mode?

609

How much is flume worth?

How do you define a partitioning key?

546

When do you call the cleanup method?

530

Explain the overview of hadoop history breifly?

627

What is the use of tools command?

198

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