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?

313

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

310

Explain about trformations and actions in the context of rdds?

311

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?

306

Explain partitions?

280

Explain api create or replace tempview()?

339

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

322

Explain mappartitions() and mappartitionswithindex()?

425

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?

291

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 independent extensions that contributed to the ambari codebase?

Explain about tajo worker configuration?

What does rdd stand for in logistics?

317

Why is space not freed up when I issue drop table?

What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

1039

We have already sql then why nosql?

427

What is lazy evaluation in Spark?

317

Define the level of parallelism and its need in spark streaming?

394

Is Hive supports Temporary Tables?

1018

How do you define "block" in HDFS?

917

What are the abstractions of Apache Spark?

307

How do I use spark with big data?

299

What is spark tool?

265

How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

710

Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

734

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