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 the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

1172

What is the Job interface in MapReduce framework?

908

What is the problem with HDFS and streaming data like logs

1022

What is the Use of SSH in Hadoop ?

959

What infrastructure do we need to process 100 TB data using Hadoop?

1005

What is the difference between a Hadoop and Relational Database and Nosql?

1076

What is Schema on Read and Schema on Write?

916

How to overwrite an existing output file during execution of mapreduce jobs?

MRO,

1092

Write a Pig UDF Example ?

768

What is the difference between traditional RDBMS and Hadoop?

1171

What is the main purpose of HDFS fsck command?

1792

What is safe mode in Hadoop?

961

Detail description of the Reducer phases?

852

What is MapFile?

964

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

1232

Un-Answered Questions { Hadoop }

Can we use Ambari Python Client to use of Ambari API’s?

What are the major areas where Ambari helps the system administrators to do?

Explain how does hbase actually delete a row?

166

What is a primary key? And what are it’s different types?

What do you understand by High availability?

what are the values stored in the cassandra column?

Which are the three modes in which hadoop can be run?

478

What do you mean by ZNode?

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

786

Can you explain spark mllib?

287

Is spark sql faster than hive?

287

Does the archiving of hive tables give any space saving in hdfs?

910

What are consumers in kafka?

541

How can we look for the namenode in the browser?

717

Explain the Reducer's Sort phase?

884

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