Apache Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Apache Hadoop Interview Questions

Questions Answers Views Company eMail

Explain the difference between NameNode

759

What other technologies have you used in hadoop sta ck?

827

what is difference between int and intwritable?

1218

What is Apache Hadoop YARN?

1291

What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?

889

What are channel selectors?

765

What are the stable versions of Hadoop?

818

Input Split & Record Reader and what they do?

792

what is the default replication factor in HDFS?

801

How indexing is done in HDFS?

829

Why are the number of splits equal to the number of maps?

783

What are the two main components of ResourceManager?

920

How will you make changes to the default configuration files?

700

What are the different types of Znodes?

810

How many instances of JobTracker can run on a Hadoop Cluser?

777

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Un-Answered Questions { Apache Hadoop }

What is a secondary namenode?

473

how to share the metastore within multiple users?

752

What is the best hardware configuration to run Hadoop?

1458

What is oozie in hadoop?

519

What is the use of Combiner?

809

Define a namenode?

494

On what basis name node distribute blocks across the data nodes?

883

Why are the number of splits equal to the number of maps?

783

What is MapFile?

798

What is compute and Storage nodes?

842

What are the different methods to run Spark over Apache Hadoop?

528

What if rack 2 and datanode fails?

900

On what basis data will be stored on a rack?

939

What is Writable & WritableComparable interface?

772

How the Client communicates with HDFS?

832

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