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?

326

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

322

Explain about trformations and actions in the context of rdds?

324

What is the key difference between textfile and wholetextfile method?

292

What do you understand by the parquet file?

294

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

322

Explain partitions?

293

Explain api create or replace tempview()?

351

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

342

Explain mappartitions() and mappartitionswithindex()?

440

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

304

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

360

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

303

explain the use of blinkdb?

313

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

357

Un-Answered Questions { Hadoop }

What are nodes and ephemeral nodes?

What is a single point of failure in Hadoop 1 and how is it resolved in Hadoop 2?

642

How does spark work with python?

315

Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

483

Explain about the major libraries that constitute the Spark Ecosystem?

433

What are partitions and tokens in cassandra?

How to insert records in apache tajo?

Is there a dual table?

Is hadoop obsolete?

692

What is an "Accumulator"?

295

How does cassandra perform write operations?

How many Reducers run for a MapReduce job?

751

In which directory hadoop is installed?

453

What is catalyst framework in spark?

322

Explain what is jobtracker in hadoop? What are the actions followed by hadoop?

456

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