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?

338

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

355

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

398

What is the task of Spark Engine

340

Un-Answered Questions { Hadoop }

Can Flume can distribute data to multiple destinations?

What is a generic udf in hive?

771

What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

471

Explain Zero Consistency?

108

Explain tokenize?

617

What is an accumulator in spark?

316

What are advantages of Spark over MapReduce?

752

How does the Pig platform handle relational systems data?

581

How does pipe operation writes the result to standard output in Apache Spark?

373

How to remove safemode of namenode forcefully in HDFS?

Define a combiner?

699

What is the maximum size of a message that can be received by the kafka?

585

Mention how many operational commands in hbase?

295

What is the distinction between apache driver and apache spark’s mllib?

How will you implement joins in HBase?

180

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