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?

735

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

693

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

717

What are the main configuration parameters in a MapReduce program?

681

What do you mean by shuffling and sorting in MapReduce?

752

What is Combiner in MapReduce?

693

Where sorting is done in Hadoop MapReduce Job?

688

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

718

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

699

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

870

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

763

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

683

What is Distributed Cache in the MapReduce Framework?

670

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

725

Is reduce-only job possible in Hadoop MapReduce?

746

Un-Answered Questions { Hadoop }

Ideally what should be replication factor in a Hadoop cluster?

552

What Is Difference Between Mapreduce and Pig ?

677

How can I import large objects (BLOB and CLOB objects) in Apache Sqoop?

Why is Transformation lazy in Spark?

362

What is speculative execution in spark?

345

What is heartbeat in hadoop?

458

Explain hdfs?

Describe how hbase uses zookeeper?

What is the best method for Storing Objects in Cassandra ?

What do you know about yarn?

453

What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

1075

On what basis data will be stored on a rack?

1180

How to resolve IOException: Cannot create directory

1076

Is bigger than spark driver maxresultsize?

313

What is BloomMapFile?

771

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