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Hadoop Interview Questions
Questions Answers Views Company eMail

What is a "map" in Hadoop?

757

What is a "reducer" in Hadoop?

841

what is Speculative Execution?

799

Explain JobConf in MapReduce.

781

What is OutputCommitter?

765

How is reporting controlled in hadoop?

746

What is Hadoop Map Reduce ?

781

what does the text input format do?

784

What happens when a datanode fails ?

735

In Hadoop, which file controls reporting in Hadoop?

754

how can you debug Hadoop code?

799

For a job in Hadoop, is it possible to change the number of mappers to be created?

748

What are the primary phases of a Reducer?

778

how indexing in HDFS is done?

823

What is the role of a MapReduce partitioner?

782


Un-Answered Questions { Hadoop }

How message is consumed by consumer in kafka?

454


What is the use of explode in Hive?

669


Where is kafka used?

508


What is the maximum size of string data type supported by hive? Mention the hive support binary formats.

606


What is identity mapper and chain mapper?

638


Define hadoop archives?

27


How do I start a spark server?

288


Compare rdbms with hbase?

144


What is org.apache.jute package?

5


Some of the most notable applications of Kafka?

490


Explain when to use explode in Hive?

652


What is compaction in hbase?

169


What is the use of context object?

443


Use of Codegen command in Hadoop sqoop?

5


Clarify how ordering in hdfs is finished?

446