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 slot in Hadoop Map-Reduce v1?

692

What happen if the number of the reducer is 0 in MapReduce?

652

What is the need of key-value pair to process the data in MapReduce?

669

What are the main configuration parameters in a MapReduce program?

644

What do you mean by shuffling and sorting in MapReduce?

705

What is Combiner in MapReduce?

646

Where sorting is done in Hadoop MapReduce Job?

657

What are the configuration parameters in the 'MapReduce' program?

676

How many times combiner is called on a mapper node in Hadoop?

646

Explain about the partitioning, shuffle and sort phase in MapReduce?

826

Does Partitioner run in its own JVM or shares with another process?

711

Why MapReduce uses the key-value pair to process the data?

641

What is Distributed Cache in the MapReduce Framework?

635

How to create a custom key and custom value in MapReduce Job?

684

Is reduce-only job possible in Hadoop MapReduce?

701

Un-Answered Questions { Hadoop }

What are the bookkeeper elements and concepts?

Explain the benefits of block transfer?

828

What is a "Spark Driver"?

341

What is the number of default partitioner in hadoop?

441

How many ways we can create rdd in spark?

294

What is the maximum recommended cell size?

174

What is Sparse Vector?

339

What do you understand by data center in cassandra?

When is the reducers are started in a MapReduce job?

871

What is spark databricks?

314

What is the row key?

157

What size is recommended for each node?

214

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

On which port does ssh work?

745

Is hadoop mandatory for spark?

283

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