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

Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?

718

What is the role of recordreader in hadoop mapreduce?

792

What happens when the node running the map task fails before the map output has been sent to the reducer?

697

Define speculative execution?

767

Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

710

What are the advantages of using map side join in mapreduce?

698

What is a map side join?

735

What is a combiner and where you should use it?

722

When should you use sequencefileinputformat?

713

What is the purpose of textinputformat?

745

What is reduce side join in mapreduce?

657

What do you mean by inputformat?

658

What are the various configuration parameters required to run a mapreduce job?

720

What is a distributed cache in mapreduce framework?

663

What do you mean by data locality?

724

Un-Answered Questions { Hadoop }

Clarify Memtable?

What is the difference between persist

365

What is spark catalyst?

340

What is Apache Hive?

877

What is a primary key? And what are it’s different types?

What are the components of a Hive query processor?

781

What are the great features of spark sql?

308

Can you overwrite Hadoop MapReduce configuration in Hive?

954

What is data pipeline in spark?

307

explain apache hbase?

153

explain the concept of RDD (Resilient Distributed Dataset). Also, state how you can create RDDs in Apache Spark.

424

Why do we need Hadoop Archives? How is it created?

609

Where are hadoop’s configuration files located and list them?

481

As part of optimizing the queries in hive, what should be the order of table size in a join query?

738

Explain what is memtable in cassandra?

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