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 block in Hadoop HDFS? What should be the block size to get optimum performance from the Hadoop cluster?

What are the main hdfs-site.xml properties?

What do you mean by the High Availability of a NameNode in Hadoop HDFS?

How does HDFS ensure Data Integrity of data blocks stored in HDFS?

What is the difference between RDBMS with Hadoop MapReduce?

848

Explain what does the conf.setMapper Class do in MapReduce?

709

How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

820

What is a Speculative Execution in Hadoop MapReduce?

706

Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

708

In MapReduce, ideally how many mappers should be configured on a slave?

708

What counter in Hadoop MapReduce?

698

What is SequenceFileInputFormat in Hadoop MapReduce?

672

How many Mappers run for a MapReduce job in Hadoop?

656

How many Mappers run for a MapReduce job?

661

How do Hadoop MapReduce works?

789

Un-Answered Questions { Hadoop }

what Hive query processor does?

714

Define the run-time architecture of Spark?

295

What is different table structure available in the hive?

713

Which command do we use to run HBase Shell?

199

What is the difference between SQL and NoSQL?

1135

Can a partition be archived? What are the advantages and Disadvantages?

809

What are the features of presto?

When would you use hbase?

184

What do you mean by Schema Declaration?

Write a Pig UDF Example ?

813

Explain how can spark be connected to apache mesos?

300

Explain caching in spark streaming.

329

What is the use of map transformation?

324

What do we mean by Paraquet?

461

What is the definition of Hive?

776

For More Un-Answered { Hadoop } Questions Click Here