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Hadoop Distributed File System (HDFS)

Hadoop's core storage system

Learn to store and manage large datasets in distributed storage using Hadoop's core storage system - HDFS.

5 minutes 5 Questions

HDFS (Hadoop Distributed File System) is the primary storage system for Hadoop applications, designed specifically to run on commodity hardware and handle large datasets. It follows a master-slave architecture with a NameNode (master) that manages the file system metadata and DataNodes (slaves) tha…

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Big Data Engineer - Hadoop Distributed File System (HDFS) Example Questions

Test your knowledge of Hadoop Distributed File System (HDFS)

Question 1

What is a block in HDFS?

A single file in HDFS A configuration file for HDFS A fixed-size chunk of data stored on a DataNode An individual record in a file A snapshot of the entire file system metadata A subset of a file

Correct Answer: A fixed-size chunk of data stored on a DataNode

A block in HDFS is a fixed-size chunk of data that is stored on a DataNode. The size of each block is configurable and defaults to 64MB. Each block is replicated across multiple DataNodes to ensure data reliability and availability.

Question 2

What is the default replication factor in HDFS?

2 6 1 5 3 4

Correct Answer: 3

By default, HDFS will store three replicas of each block. This provides a degree of data redundancy and ensures that data can still be accessed if one or two DataNodes fail.

Question 3

What is the purpose of the HDFS CheckpointNode?

The HDFS CheckpointNode is used to manage the permissions of files in HDFS. The HDFS CheckpointNode is used to manage the quota of files in HDFS. The HDFS CheckpointNode periodically creates a snapshot of the file system metadata and saves it to a local file system, which can be used to recover the NameNode in the event of a failure. The HDFS CheckpointNode is used to manage the storage capacity of the NameNode. The HDFS CheckpointNode is used to manage the replication factor of files in HDFS. The HDFS CheckpointNode is used to compress files in HDFS.

Correct Answer: The HDFS CheckpointNode periodically creates a snapshot of the file system metadata and saves it to a local file system, which can be used to recover the NameNode in the event of a failure.

The HDFS CheckpointNode periodically creates a snapshot of the file system metadata and saves it to a local file system. This metadata includes the file system namespace, block locations, and the transaction log. The CheckpointNode serves as a backup for the NameNode in the event of a failure, providing a checkpoint that can be used to recover the file system metadata.

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