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Hadoop Interview Questions
Questions Answers Views Company eMail

Explain what is shuffling in mapreduce?

627

Explain what is distributed cache in mapreduce framework?

616

Mention what are the main configuration parameters that user need to specify to run mapreduce job?

731

Explain what is the function of mapreduce partitioner?

640

Explain what is heartbeat in hdfs?

35

Explain what is a difference between an input split and hdfs block?

31

Explain how indexing in hdfs is done?

38

Mention what is the best way to copy files between hdfs clusters?

73

Mention what is the difference between hdfs and nas?

67

What is a difference between an input split and hdfs block?

76

Mention what is the data storage component used by hadoop?

446

Mention what does the text input format do?

414

Mention what daemons run on a master node and slave nodes?

469

Explain what is namenode in hadoop?

438

Explain what is a sequence file in hadoop?

467


Un-Answered Questions { Hadoop }

What is OutputCommitter?

810


Name different types of the data model?

93


Mention what happens if the preferred replica is not in the ISR?

555


How to control access to data in impala?

47


What is difference between map and flatmap?

298


what is Zookeeper in Kafka? Can we use Kafka without Zookeeper?

551


What is pair rdd in spark?

287


What is the difference between HDFS block and input split?

887


how Cassandra writes data?

117


On what basis Namenode will decide which datanode to write on?

1264


What do you understand from Node redundancy and is it exist in hadoop cluster?

1232


what is the traditional method of message trfer?

564


Can Apache Kafka be used without Zookeeper?

1035


When to use Cassandra?

124


How can you control the number of mappers used by the sqoop command?

5