Apache Hadoop Interview Questions
Questions Answers Views Company eMail

What is a 'block' in HDFS?

672

What is Derby database?

623

How many Daemon processes run on a Hadoop system?

821

What are the limitations of importing RDBMS tables into Hcatalog directly?

658

How the Client communicates with HDFS?

708

What is NoSQL?

635

What is Row Key?

641

What is a Task instance in Hadoop? Where does it run?1

609

What is IdentityMapper?

633

Why do we use Hadoop?

628

what is the typical block size of an HDFS block?

639

What is Hadoop Custom partitioner ?

719

What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

929

What stored in HDFS?

609

What is crontab? Explain with suitable example?

662


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Un-Answered Questions { Apache Hadoop }

Define a job tracker?

382


What are different types of filesystem?

799


What are the most commonly defined input formats in Hadoop?

730


What is zookeeper in hadoop?

365


What is a heartbeat in HDFS?

613






Suppose Hadoop spawned 100 tasks for a job and one of the task failed. What will Hadoop do?

467


What is Hadoop serialization?

391


What's the best way to copy files between HDFS clusters?

793


Explain how input and output data format of the hadoop framework?

398


What if a namenode has no data?

401


What are the default configuration files that are used in hadoop?

388


Why the name ‘hadoop’?

381


How do you categorize a big data?

367


What is the relation between job and task in hadoop?

365


What is the purpose of DataNode block scanner?

658