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?

282

What is lazy evaluation and how is it useful?

306

How is transformation on rdd different from action?

345

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

297

What is pagerank?

286

What is dag – directed acyclic graph?

304

Explain schemardd?

359

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

331

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

345

What does reduce action do?

282

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

273

Explain the use of broadcast variables

319

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

307

Explain sortbykey() operation?

292

List various commonly used machine learning algorithm?

373

Un-Answered Questions { Hadoop }

What is driver and executor in spark?

316

What is spark in python?

294

What is meant by in-memory processing in Spark?

311

What is the importance of — the split-by clause in running parallel import tasks in sqoop?

What is a bag in apache pig?

550

Can you explain about the cluster manager of apache spark?

262

What is different table structure available in the hive?

671

What does the following query do? Insert overwrite table employees partition (country, state) select ..., Se.cnty, se.st from staged_employees se;

928

how can you debug Hadoop code?

846

Does Flume provide 100% reliability to the data flow?

137

Explain the flatMap operation on Apache Spark RDD?

318

Explain Apache Ambari?

What is the importance of dfs.namenode.name.dir in HDFS?

How to fetch particular columns in pig?

597

Is it possible to create cartesian join between 2 tables, using hive?

691

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