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 MapReduce?

1 1757

What MapReduce framework consists of?

1065

Can we submit the mapreduce job from slave node?

1060

How can we control particular key should go in a specific reducer?

872

How can you add the arbitrary key-value pairs in your mapper?

1394

What is Reduce only jobs?

1 1629

What is a IdentityMapper and IdentityReducer in MapReduce ?

913

Explain Working of MapReduce?

928

Write a Mapreduce Program for Character Count ?

1013

how to proceed to write your first mapreducer program?

1314

How to set the number of reducers?

1327

Developing a MapReduce Application?

911

Different ways of debugging a job in MapReduce?

1067

Explain the Reducer's reduce phase?

1017

Why do we use HDFS for applications having large data sets and not when there are lot of small files?

1 2686

Un-Answered Questions { Hadoop }

What is lambda in spark?

288

Say what the object inspector functionality is in hive?

714

why use hcolumndescriptor class?

149

What is CQL?

What is OutputCommitter?

765

How rdd persist the data?

283

What co-group does in Pig?

599

How will you explain COGROUP in Pig?

558

How will you design or modify schema in hbase programmatically?

155

Name some companies that are already using Spark Streaming?

242

What are the port numbers of task tracker?

438

What is the need of MapReduce?

590

Explain about the replication and multiplexing selectors in Flume?

100

What do you understand by compute and storage nodes?

652

While writing evaluate UDF, which method has to be overridden?

543

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