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 "map" and what is "reducer" in Hadoop?

635

What is Shuffling and Sorting in a MapReduce?

663

What is the difference between Hadoop and RDBMS?

633

how can you check whether Namenode is working beside using the jps command?

670

Illustrate a simple example of the working of MapReduce.

631

For a Hadoop job, how will you write a custom partitioner?

657

what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

695

what is the Hadoop MapReduce APIs contract for a key and value class?

668

When is it suggested to use a combiner in a MapReduce job?

636

What is the process of changing the split size if there is limited storage space on Commodity Hardware?

714

how Hadoop is different from other data processing tools?

651

List the configuration parameters that have to be specified when running a MapReduce job.

602

what is a sequence file in Hadoop?

677

What are the key differences between Pig vs MapReduce?

614

When is it not recommended to use MapReduce paradigm for large

650

Un-Answered Questions { Hadoop }

Name the scalar data type and complex data types in Pig?

676

Can we create a hadoop cluster from scratch?

437

Is hadoop based on google mapreduce?

694

What are the different zkclientbindings?

What is the fundamental difference between a MapReduce InputSplit and HDFS block?

621

Is spark an etl?

294

What is the use of “resultset execute” method?

Why should I use spark?

305

Specify what the information segments utilized by hadoop are?

438

Why password is needed in ssh localhost?

808

Specify the different methods of hive?

723

Explain about the core components of a distributed Spark application?

293

What is Apache Avro?

How can we see all the hosts that are available in Ambari?

Can you change the block size of hdfs files?

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