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?

922

What is Partioner in hadoop? Where does it run

975

Does Hadoop requires RAID?

945

What is the purpose of DataNode block scanner?

964

What is a checkpoint?

967

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

1220

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 }

How can an application connect to Hive run as a server?

1168

Explain reduceByKey() Spark operation?

300

What are the main configuration parameters in a MapReduce program?

636

How apache spark works?

294

Mention what needs to be taken care while adding a column?

What is HDFS Federation?

983

How do I know if flume agent is running?

116

Can you define inputsplit in hadoop?

468

How is reporting controlled in hadoop?

782

What are the various data sources available in SparkSQL?

333

Explain the different types of repairs.

What is unstructured data?

667

Why MapReduce uses the key-value pair to process the data?

633

What relational operators can we use that are related to combining and splitting in Pig language?

553

Is it necessary to write a mapreduce job in java?

627

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