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?

844

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

704

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

815

What is a Speculative Execution in Hadoop MapReduce?

699

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

704

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

705

What counter in Hadoop MapReduce?

694

What is SequenceFileInputFormat in Hadoop MapReduce?

669

How many Mappers run for a MapReduce job in Hadoop?

654

How many Mappers run for a MapReduce job?

655

How do Hadoop MapReduce works?

785

Un-Answered Questions { Hadoop }

When should we use SORT BY instead of ORDER BY?

746

What are the key differences between Pig vs MapReduce?

656

Can we deploye job tracker other than name node?

696

What are the types of transformation in RDD in Apache Spark?

336

Are results returned as they become available, or all at once when a query completes?

Can you overwrite Hadoop MapReduce configuration in Hive?

954

Can you list few commonly used hive services?

690

what is the maximum size of the message does Kafka server can receive?

570

What is apache spark sql?

311

How to managed create a table in hive ?

768

How to specify more than one directory as input in the Hadoop MapReduce Program?

772

What are the actions followed by hadoop?

504

What are the problems with Hadoop 1.0?

1097

What is Buckets in Hive?

795

What is having clause in apache tajo?

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