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

When to use spark sql?

323

What are the great features of spark sql?

308

Can you explain apache spark?

337

What is apache presto?

Describe REVERSE function in Hive with example?

762

How to Alter Hive Database?

783

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

830

CONCAT function in Hive with Example?

869

Is it possible to create multiple table in hive for same data?

728

UPPER or UCASE function in Hive with example?

861

What is CTAS Table in Hive?

785

How do you write your own custom SerDe ?

778

How will you read and write HDFS files in Hive?

748

Explain ALTER Table statement in Hive?

770

LOWER or LCASE function in Hive with example?

749

Un-Answered Questions { Hadoop }

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

755

What is a "Spark Executor"?

369

Why HDFS performs replication, although it results in data redundancy?

148

List out the ways of creating RDD in Apache Spark?

303

What do you understand by mapreduce?

701

Mention what are the three types of tombstone markers in hbase?

227

What happens when a datanode fails ?

841

Can I do trforms or add new functionality?

What do you mean by Speculative execution in Apache Spark?

312

Explain the process of spilling in MapReduce?

649

UPPER or UCASE function in Hive with example?

861

What is Importance of Java in Apache Kafka?

592

What is the inputsplit in map reduce software?

678

What is the port number for NameNode

887

What is a yaml file in cassandra?

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