HDFS and MapReduce Quiz

What does HDFS stand for?

• High-Detailed File System

• Hadoop Distributed File System

• Hadoop Data File System

• High-Definition File System

Which of the following is a primary purpose of HDFS?

• Provide a database solution

• Store large files reliably across multiple machines

• Perform real-time analytics

• Host web applications

HDFS is optimized for:

• Small files

• Read-heavy workloads

• Write-once, read-many access patterns

• Multi-user database operations

What is the default block size in HDFS?

• 64 MB

• 128 MB

• 512 MB

• 1 GB

In HDFS architecture, what is the role of the NameNode?

• Store actual data blocks

• Manage file system metadata and namespace

• Replicate data blocks

• Act as a user interface

Which of the following is a characteristic of HDFS?

• Data is stored in a centralized database

• Data is replicated across multiple nodes

• It only supports structured data

• Data is stored in a fixed format

How many replicas of each data block are stored in HDFS by default?

• 1

• 2

• 3

• 4

Which daemon runs on the cluster nodes to handle the storage of HDFS data?

• JobTracker

• DataNode

• NameNode

• ResourceManager

What happens to data in HDFS when a DataNode fails?

• The data is lost permanently

• Data is recovered from the NameNode

• The data blocks are automatically replicated to other DataNodes

• The DataNode is restarted

Which command is used to copy files from the local filesystem to HDFS?

• hdfs put

• hdfs upload

• hdfs cp

• hdfs move