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

Explain the basic architecture of Hadoop?

996

On what basis name node distribute blocks across the data nodes?

1102

Name some companies that use Hadoop?

Airtel,

1000

what is hadoop archive?

966

Rack awareness of Namenode?

911

Have you ever used Counters in Hadoop. Give us an example scenario?

1096

How is the distance between two nodes defined in Hadoop?

1497

What is bucketing in Hive?

1 2122

What is speculative execution in Hadoop?

1093

How we can change Replication factor when Data is on the fly?

1385

What alternate way does HDFS provides to recover data in case a Namenode

995

What are the problems with Hadoop 1.0?

1096

what are the nodes in the Hadoop cluster?

1074

What are the differences between Hive and RDBMS?

1 2432

What Mapper does?

1033

Un-Answered Questions { Hadoop }

What happens if the block on Hadoop HDFS is corrupted?

Mention what is the maximum size of the message does kafka server can receive?

571

What are different modes of execution in Apache Pig?

917

While starting hadoop services, datanode service is not running?

482

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

What does hbase consists of?

186

Does kafka use hdfs?

527

What is the difference between rdd and dataframe?

349

What is spark context spark session?

295

What is the role of “ambari-qa” user?

How to use Apache Zookeeper command line interface?

1200

What are secondary indexes?

101

What are the features of apache mahout?

What are the main features of hdfssite.xml?

What is the use of InputFormat in MapReduce process?

704

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