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

Hadoop Interview Questions

Questions Answers Views Company eMail

Who divides the file into Block while storing inside hdfs in hadoop?

What are file permissions in HDFS? how does HDFS check permissions for files/directory?

How one can change Replication factor when Data is already stored in HDFS

Explain HDFS “Write once Read many” pattern?

Why is block size set to 128 MB in HDFS?

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

What is the importance of dfs.namenode.name.dir in HDFS?

How one can format Hadoop HDFS?

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

How to format the HDFS? How frequently it will be done?

Which one is the master node in HDFS? Can it be commodity hardware?

What happens if the block on Hadoop HDFS is corrupted?

What is a block in HDFS, why block size 64MB?

How NameNode tackle Datanode failures in HDFS?

How is indexing done in Hadoop HDFS?

Un-Answered Questions { Hadoop }

Is the keyword ‘FUNCTIONAL’ a User Defined Function (UDF)?

596

What do you understand by snitches?

What is the History of Cassandra Database ?

Explain about postgresql storage handler?

What does apache spark do?

338

What kind of data warehouse application is suitable for Hive? What are the types of tables in Hive?

771

What are the key points of data model of Cassandra?

What is a record reader?

453

What is partitioning key?

594

Define commit log?

What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?

579

Name types of Cluster Managers in Spark.

329

Where are hadoop’s configuration files located and list them?

484

What are the various InputFormats in Hadoop?

699

Use of list-databases command in hadoop sqoop?

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