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

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

1300

Can Hadoop be compared to NOSQL database like Cassandra?

961

What is a Secondary Namenode? Is it a substitute to the Namenode?

1066

what are relational operations in pig latin?

915

What is the difference between SQL and NoSQL?

1135

What are the additional benefits YARN brings in to Hadoop?

1009

what are the steps involved in decommissioning removing

1065

What is the process to change the files at arbitrary locations in HDFS?

1448

What is difference between split and block in hadoop?

1437

How many JVMs run on a slave node?

1094

What is a block and block scanner in HDFS?

1065

What is compute and Storage nodes?

1060

how would you modify that solution to only count the number of unique words in all the documents?

1014

How can you overwrite the replication factors in HDFS?

1285

What are the modules that constitute the Apache Hadoop 2.0 framework?

1048

Un-Answered Questions { Hadoop }

Are job tracker and task trackers present in separate machines?

503

What is the role of recordreader in hadoop mapreduce?

790

What are configuration files in Hadoop?

561

Is it possible to use Apache Spark for accessing and analyzing data stored in Cassandra databases?

315

Explain the process to trigger automatic clean-up in Spark to manage accumulated metadata.

325

You have a file employee.txt in the hdfs directory with 100 records. You want to see only the first 10 records from the employee.txt file. How will you do this?

1000

Explain in which directory hadoop is installed?

510

What the information segments utilized by hadoop are?

448

What are the main components of spark?’

331

Define the purpose of the partition function in mapreduce framework

716

How would you restart NameNode?

454

How can we change the split size if our commodity hardware has less storage space?

714

Explain the rudimentary difference between Cassandra and HBase?

What are partitions in cassandra?

Define standalone mode in hbase?

147

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