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?

706

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

683

What is the problem with the small file in Hadoop?

692

How many Reducers run for a MapReduce job?

748

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

751

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

695

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

895

What is Reducer in MapReduce?

777

How many Reducers run for a MapReduce job in Hadoop?

629

What is MapReduce in Hadoop?

696

Why Hadoop MapReduce?

713

Why can aggregation not be done in Mapper in MapReduce?

652

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

732

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

652

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

724

Un-Answered Questions { Hadoop }

Define Partition and Partitioner in Apache Spark?

318

What is spark vectorization?

334

What operations does the "RDD" support?

313

State some Ambari components which we can use for automation as well as integration?

110

how you can reduce churn in ISR? When does broker leave the ISR?

661

How to come out of the insert mode?

840

What is the difference between apache mahout and cloudera oryx ?

When is it not recommended to use MapReduce paradigm for large

695

Can we run Apache Spark without Hadoop?

332

How would you tackle counting words in several text documents?

1064

Name the operations supported by rdd?

348

What is the difference between hadoop and other data processing tools?

734

What are the disservices of utilizing Apache Spark over Hadoop MapReduce?

673

What is the difference between leader and follower in kafka?

604

What is Resilient Distributed Dataset (RDD) in Apache Spark? How does it make spark operator rich?

304

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