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?

320

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

346

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

378

What is the task of Spark Engine

328

Un-Answered Questions { Hadoop }

How to setup the local repository manually?

Mention what are the data components used by Hadoop?

659

How can we create a hadoop cluster from scratch?

423

Explain what is storage and compute nodes?

512

What are the different file permissions in the HDFS for files or directory levels?

146

What is a Seed Node in Cassandra ?

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

1231

What is map/reduce job in hadoop?

642

What are the types of transformation in RDD in Apache Spark?

320

Which storage level does the cache () function use?

299

What the information segments utilized by hadoop are?

417

How does impala achieve its performance improvements?

What is Clustring in Hive?

741

Mention key components of Hive Architecture?

850

What is SequenceFileInputFormat in Hadoop MapReduce?

627

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