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?

1212

What is the Job interface in MapReduce framework?

954

What is the problem with HDFS and streaming data like logs

1062

What is the Use of SSH in Hadoop ?

993

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

1048

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

1109

What is Schema on Read and Schema on Write?

944

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

MRO,

1129

Write a Pig UDF Example ?

813

What is the difference between traditional RDBMS and Hadoop?

1202

What is the main purpose of HDFS fsck command?

1844

What is safe mode in Hadoop?

1005

Detail description of the Reducer phases?

904

What is MapFile?

1000

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

1271

Un-Answered Questions { Hadoop }

Why is Spark RDD immutable?

383

Is hadoop required for spark?

310

Explain Data Type Conversion in Hive?

760

Explain Spark countByKey() operation?

337

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

What is JobTracker?

478

Why do we use Hadoop?

961

Characterize data integrity? How does hdfs ensure information integrity of data blocks squares kept in hdfs?

Clarify about the smb join in hive?

711

Explain api create or replace tempview()?

351

What is used to store data generally?

Explain how do ‘map’ and ‘reduce’ works?

780

What are the Data extraction tools in Hadoop?

what Hive is composed of ?

724

Can free-form SQL queries be used with Sqoop import command? If yes, then how can they be used?

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