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 do you mean by the worker node?

314

What is rdd lineage graph? How is it useful in achieving fault tolerance?

311

Explain about trformations and actions in the context of rdds?

312

What is the key difference between textfile and wholetextfile method?

266

What do you understand by the parquet file?

280

If there is certain data that we want to use again and again in different transformations, what should improve the performance?

308

Explain partitions?

280

Explain api create or replace tempview()?

339

Define parquet file format? How to convert data to parquet format?

324

Explain mappartitions() and mappartitionswithindex()?

426

Explain pipe() operation. How it writes the result to the standard output?

280

Explain transformation in rdd. How is lazy evaluation helpful in reducing the complexity of the system?

346

How to identify that given operation is transformation/action in your program?

282

explain the use of blinkdb?

292

How do you parse data in xml? Which kind of class do you use with java to parse data?

338

Un-Answered Questions { Hadoop }

What are the main features of impala?

What is a MapReduce Combiner?

807

What is the InputFormat ?

1025

What is Reducer in Hadoop?

555

Why are we using Flume?

What is Safemode in Apache Hadoop?

746

Mention the common features in Pig and Hive?

921

what does the text input format do?

822

Where is apache spark used?

280

What is avro format?

What do you understand by worker node?

287

Is it possible to provide multiple inputs to hadoop? If yes, explain.

670

How is RDD in Apache Spark different from Distributed Storage Management?

344

Can you do real-time processing with Spark SQL?

321

What is Secondary Index in Cassandra ?

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