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

Apache HDFS Hadoop Distributed File System Interview Questions

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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?

How to remove safemode of namenode forcefully in HDFS?

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?

Un-Answered Questions { Apache HDFS Hadoop Distributed File System }

Differentiate HDFS & HBase?

What is Secondary NameNode in Hadoop HDFS?

Explain how indexing in hdfs is done?

What is secondary namenode? Is it a substitute or back up node for the namenode?

What happens when two clients try to access the same file on HDFS?

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How to create Users in hadoop HDFS?

What is a job tracker?

Explain the process that overwrites the replication factors in HDFS?

What are the key features of HDFS?

What is the procedure to create users in HDFS and how to allocate Quota to them?

Explain how are file systems checked in hdfs?

How to Delete directory from HDFS?

How NameNode tackle Datanode failures in HDFS?

What is Block in HDFS?

Characterize data integrity? How does hdfs ensure information integrity of data blocks squares kept in hdfs?

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