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?

805

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

661

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

776

What is a Speculative Execution in Hadoop MapReduce?

657

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

658

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

669

What counter in Hadoop MapReduce?

651

What is SequenceFileInputFormat in Hadoop MapReduce?

633

How many Mappers run for a MapReduce job in Hadoop?

616

How many Mappers run for a MapReduce job?

615

How do Hadoop MapReduce works?

736

Un-Answered Questions { Hadoop }

Explain Data Type Conversion in Hive?

725

What is the function of Cluster.Builder class in Cassandra?

139

What is spark slang for?

282

How is dag created in spark?

289

Why Mapper runs in heavy weight process and not in a thread in MapReduce?

642

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

658

What does the file hadoop-metrics.properties do?

488

What is the purpose of sqoop-merge?

Name a few commonly used spark ecosystems?

291

What is ganglia is used for in ambari?

What is the use of paging cqlsh command in Cassandra?

What is meant by rdd lazy evaluation?

405

Is it possible to add a parameter while running a saved job?

How data or file is written into Hadoop HDFS?

Mention some machine learning algorithms exposed by mahout?

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