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?

305

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?

320

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?

305

List various commonly used machine learning algorithm?

394

Un-Answered Questions { Hadoop }

What is pig properties?

594

What is SSTable? How is it different from other relational tables?

122

Explain what is Hive?

770

What is session in Cassandra?

163

What are Paired RDD?

331

What is a MapFile?

784

What is python stress test in cassandra?

Explain the concept of resilient distributed dataset (rdd).

2072

Detail description of the Reducer phases?

913

What is the key- value pair in Hadoop MapReduce?

737

What does rack awareness algorithm means and why is it utilized as a part of hadoop?

484

What are the main features of hdfssite.xml?

In ambari 2.6.2 version added the following features:

What is in memory in spark?

296

Why HDFS performs replication, although it results in data redundancy?

148

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