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

How does lazy evaluation work in spark?

289

What is the use of dataframe in spark?

294

When should you use spark cache?

287

How do I start a spark server?

298

What is executor and driver in spark?

289

Is apache spark an etl tool?

278

What is a spark context?

274

Where is rdd stored?

309

What is apache spark engine?

300

Is hadoop mandatory for spark?

283

What is map in spark?

333

Is spark written in java?

315

How do I start a spark cluster?

300

Does spark sql use hive?

275

What is the default spark executor memory?

281

Un-Answered Questions { Hadoop }

What are the different types of partitioners in cassandra?

How does HDFS Index Data blocks? Explain.

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

318

How to copy a file into HDFS with a different block size to that of existing block size configuration?

Explain about transformations and actions in the context of RDDs.

349

explain apache hbase?

149

Who invented hadoop?

685

In how many ways RDDs can be created? Explain.

302

Can you join multiple fields in Apache

533

What is the Hadoop MapReduce API contract for a key and value Class?

1292

How data or file is written into Hadoop HDFS?

How to create custom key and custom value in MapReduce Job?

602

What is document store db? Explain with an example.

Explain what is a cluster in cassandra?

How Spark uses Akka?

320

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