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 is a combiner in hadoop?

520

Have you ever used counters in hadoop?

426

What are some typical functions of job tracker in hadoop?

419

Can you define inputsplit in hadoop?

481

What daemons run on master nodes?

490

Can you explain rack awareness?

440

Can you explain record reader?

439

What are the side effects of not running a secondary name node?

456

What are the main components of hadoop?

437

What do you understand by unit and ()in scala?

505

Can you define udf?

435

What is the difference between an inputsplit and a block?

636

What is the purpose of context object?

435

Can you explain sequence file in hadoop?

414

What is the use of recordreader in hadoop?

425

Un-Answered Questions { Hadoop }

Describe the run-time architecture of Spark?

284

How hadoop mapreduce works?

651

What is the meaning of compaction in hbase?

167

When to use –target-dir and when to use –warehouse-dir while importing data?

Define Simple Strategy?

130

When can you use ALTER KEYSPACE?

Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

685

Define data cleansing?

410

Does Pig give any warning when there is a type mismatch or missing field?

904

What is spark accreditation?

277

Explain about the major libraries that constitute the Spark Ecosystem?

421

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

644

What are the design goals of zookeeper?

What is document store db? Explain with an example.

What is a Sparse Vector?

332

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