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

Does cloudera offer a vm for demonstrating impala?

How do I try impala out?

How does impala compare to hive and pig?

How does impala achieve its performance improvements?

Can I use impala to query data already loaded into hive and hbase?

What happens when the data set exceeds available memory?

How much memory is required?

Are results returned as they become available, or all at once when a query completes?

Why do I have to use refresh and invalidate metadata, what do they do?

Why does my select statement fail?

Does impala performance improve as it is deployed to more hosts in a cluster in much the same way that hadoop performance does?

164

What is RDD in Apache Spark? How are they computed in Spark? what are the various ways in which it can create?

301

What role does worker node play in Apache Spark Cluster? And what is the need to register a worker node with the driver program?

334

What is SparkSession in Apache Spark? Why is it needed?

370

What is the task of Spark Engine

314

Un-Answered Questions { Hadoop }

Can multiple clients write into a Hadoop HDFS file concurrently?

Explain the use of tasktracker in the hadoop cluster?

605

Explain briefly what is Action in Apache Spark? How is final result generated using an action?

299

While installing, why does apache have three config files - srm.conf, access.conf and httpd.conf?

540

What is Apache Zookeeper Meant For?

How does job tracker schedule a job for the task tracker?

431

Is nosql follow relational db model?

423

What is apache spark engine?

286

List the network requirements for using Hadoop ?

593

What's the best way to copy files between HDFS clusters?

1324

What is client mode in spark?

305

What is data skew in spark?

281

What are the tools used in big data?

401

What does the "USE" command in hive do?

737

What is Writable & WritableComparable interface?

897

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