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?

1264

Can Hadoop be compared to NOSQL database like Cassandra?

910

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

1032

what are relational operations in pig latin?

867

What is the difference between SQL and NoSQL?

1077

What are the additional benefits YARN brings in to Hadoop?

963

what are the steps involved in decommissioning removing

1015

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

1418

What is difference between split and block in hadoop?

1396

How many JVMs run on a slave node?

1044

What is a block and block scanner in HDFS?

1030

What is compute and Storage nodes?

1024

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

973

How can you overwrite the replication factors in HDFS?

1247

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

1006

Un-Answered Questions { Hadoop }

What combiners is and when you should use a combiner in a MapReduce Job?

624

What is a mapreduce algorithm?

642

Explain the use of File system API in Apache Spark

286

How is mapreduce related to cloud computing?

659

Explain bagtostring in pig?

546

What is the difference between Apache Pig and Hive?

607

What is the default port of presto?

How is 0xdata's h2o different from apache mahout ?

How many instances of tasktracker run on a hadoop cluster?

679

Differentiate between piglatin and hiveql?

571

Who divides the file into Block while storing inside hdfs in hadoop?

When application is on high latency (high response time)?

789

What is Directed Acyclic Graph(DAG)?

309

What is cluster in Cassandra data model?

Write a Hive UDF that returns a sentiment score. For example, if good = 1, bad = -1, and average = 0, then a review of a restaurant states "Good food, bad service," your score might be 1 - 1 = 0.

687

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