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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 the key- value pair in MapReduce?

779


What is spark vs hadoop?

278


What is the usefulness of the distributed by clause in hive?

734


What is kafka in hadoop?

511


What are the benefits/ advantages of Cassandra?

76


What is the use of “resultset execute” method?

92


What is the purpose of ‘dump’ keyword in Pig?

626


What is throughput? How does HDFS provide good throughput?

30


What is cqlsh? And why is it used?

71


Which command do we use to run HBase Shell?

197


What are the three types of tombstone markers in hbase?

152


Why HDFS stores data using commodity hardware despite the higher chance of failures in hadoop?

35


What OS Cassandra supports?

63


What is lineage graph?

460


What are the main methods of data transferring in hadoop sqoop?

5