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 the module in HDFS?

Tell me two most commonly used commands in HDFS?

What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

HDFS is used for applications with large data sets, not why Many small files?

What is throughput? How does HDFS provide good throughput?

File permissions in HDFS?

What is Hadoop HDFS – Hadoop Distributed File System?

How to change the replication factor of data which is already stored in HDFS?

What is Block in HDFS?

How to copy a file into HDFS with a different block size to that of existing block size configuration?

Can multiple clients write into an HDFS file concurrently?

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

Does HDFS allow a client to read a file which is already opened for writing?

How HDFS client divide the file into the block while storing inside HDFS?

What is the difference between Input Split and an HDFS Block?

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

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

Differentiate HDFS & HBase?

What happens if the block on Hadoop HDFS is corrupted?

What do you mean by meta data in hdfs? List the files associated with metadata.

If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

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What happens if the block in HDFS is corrupted?

How is hdfs block size different from traditional file system block size?

Can multiple clients write into an HDFS file concurrently?

Define HDFS and talk about their respective components?

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

How NameNode tackle Datanode failures in HDFS?

What is the module in HDFS?

Data node block size in HDFS, why 64MB?

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

Does HDFS allow a client to read a file which is already opened for writing?

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