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

Ideally what should be the block size in hadoop?

461

What happen when namenode enters in safemode in hadoop?

431

What is shuffleing in mapreduce?

650

Does mapreduce programming model provide a way for reducers to communicate with each other? In a mapreduce job can a reducer communicate with another reducer?

681

How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

826

Describe what happens to a mapreduce job from submission to output?

667

If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

715

What are mapreduce new and old apis while writing map reduce program?. Explain how it works

658

Give some points of pig for hadoop ?

555

How does master slave architecture in the hadoop?

818

Explain the wordcount implementation via hadoop framework ?

726

What is hadoop framework?

725

What is partioner in hadoop? Where does it run,mapper or reducer?

673

What is a task instance in hadoop? Where does it run?

616

How to enable recycle bin in hadoop?

766

Un-Answered Questions { Hadoop }

What is Distributed Cache in Hadoop?

458

What do you mean by logging in cassandra?

Define Nodetool Utility?

What are watches?

1034

What are the languages in which Apache Spark create API?

298

How does data transfer happen from hdfs to hive?

148

What makes Apache Spark good at low-latency workloads like graph processing and machine learning?

328

What are the steps involved in MapReduce framework?

984

Explain Alter Table Statement in HCatalog?

Define consistency?

131

What is a yaml file in cassandra?

Define the term thrift

134

What is spark reducebykey?

268

What is ObjectInspector functionality?

827

Explain countByValue() operation in Apache Spark RDD?

268

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