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 is NameNode and DataNode in HDFS?

Why HDFS stores data using commodity hardware despite the higher chance of failures?

What are file permissions in HDFS and how HDFS check permissions for files or directory?

How data or file is written into HDFS?

What is throughput? How does HDFS get a good throughput?

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

List the various HDFS daemons in HDFS cluster?

What is the difference between NAS and HDFS?

If data is present in HDFS and RF is defined, then how can we change Replication Factor?

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

What is the optimal block size in HDFS?

What do you mean by metadata in HDFS?

Data node block size in HDFS, why 64MB?

What happens if the block in HDFS is corrupted?

What is Fault Tolerance in HDFS?

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

Why HDFS?

Write the command to copy a file from linux to hdfs?

How to access HDFS?

How to create directory in HDFS?

Define hadoop archives?

What is the command for archiving a group of files in hdfs.

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

Define data integrity?

Why is block size set to 128 MB in Hadoop HDFS?

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Can we have different replication factor of the existing files in hdfs?

Data node block size in HDFS, why 64MB?

Explain HDFS “Write once Read many” pattern?

What is the optimal block size in HDFS?

Will various customers write into an hdfs record simultaneously?

Why does hive not store metadata information in hdfs?

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