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?

701

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

680

What is the problem with the small file in Hadoop?

687

How many Reducers run for a MapReduce job?

741

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

745

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

691

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

893

What is Reducer in MapReduce?

775

How many Reducers run for a MapReduce job in Hadoop?

628

What is MapReduce in Hadoop?

694

Why Hadoop MapReduce?

709

Why can aggregation not be done in Mapper in MapReduce?

648

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

726

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

649

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

723

Un-Answered Questions { Hadoop }

List the network requirements for using Hadoop ?

663

Explain about the scalar datatypes in Apache Pig?

966

Which command is used to show the current hbase user?

194

Explain about the partitioning, shuffle and sort phase

730

Can impala be used for complex event processing?

169

What do you understand by cluster in cassandra?

What are Actions?

332

Compare hadoop & spark?

286

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

811

What is the data storage component used by Hadoop?

678

Explain the level of parallelism in spark streaming?

300

How Cassandra provide High availability feature?

What is a bloom filter and how does it help in searching rows?

177

What are the different execution mode available in Pig?

1092

Why do we need hadoop for big data analytics?

474

For More Un-Answered { Hadoop } Questions Click Here