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 IdentityMapper?

1004

Why do we use Hadoop?

925

what is the typical block size of an HDFS block?

916

What is Hadoop Custom partitioner ?

1001

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

1328

What stored in HDFS?

926

What is crontab? Explain with suitable example?

1057

What is the difference between Hadoop and Traditional RDBMS?

923

What is Partioner in hadoop? Where does it run

975

Does Hadoop requires RAID?

945

What is the purpose of DataNode block scanner?

966

What is a checkpoint?

967

Did you ever ran into a lop sided job that resulted in out of memory error

1222

What is the communication channel between client and namenode/datanode?

1734

What are the different operational commands in HBase at record level and table level?

361

Un-Answered Questions { Hadoop }

List the various options available with the Hive command?

903

State some highlights of Ambari?

What do you mean by replication strategy?

What is Cassandra?

how can we change Replication Factor?

1019

Different running modes for running Pig?

890

What are combiners? When should I use a combiner in my MapReduce Job?

901

What do you think about the speculative execution?

436

What are the main benefits of using cassandra?

Explain the functionality of object-inspector.

721

What are Pig Execution modes?

615

How many types of nosql databases?

What are the machine learning algorithms supports in apache mahout?

115

How can you native libraries be included in yarn jobs?

439

What is Mapper in Hadoop?

555

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