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

Explain parquet file?

303

What is lazy evaluation and how is it useful?

316

How is transformation on rdd different from action?

358

What is a dataset? What are its advantages over dataframe and rdd?

313

What is pagerank?

300

What is dag – directed acyclic graph?

318

Explain schemardd?

370

Describe coalesce() operation. When can you coalesce to a larger number of partitions? Explain.

348

When we create an rdd, does it bring the data and load it into the memory?

360

What does reduce action do?

293

how can you identify whether a given operation is transformation or action?

283

Explain the use of broadcast variables

336

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

321

Explain sortbykey() operation?

303

List various commonly used machine learning algorithm?

391

Un-Answered Questions { Hadoop }

What is the use of MasterServer?

178

When would you use hbase?

184

What is apache hcatalog?

784

Can we run spark on windows?

293

Do we need to install scala for spark?

325

Discuss writeahead logging in Apache Spark Streaming?

343

Explain hbasestorage function?

630

Is there a module to implement sql in spark? How does it work?

306

Do we need to place 2nd and 3rd data in rack 2 only?

486

What are the filters are available in apache hbase?

157

What is Partioner in hadoop? Where does it run

1024

Will various customers write into an hdfs record simultaneously?

Define “speculative execution” in hadoop?

475

What is the difference between cache and persist in spark?

352

What do you understand by data center in cassandra?

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