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Quiz on HDFS

Quiz on HDFS

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Question 1 of 10

1. Question

What does HDFS stand for?

High-Definition File Server
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Hadoop Data File Storage
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Hadoop Distributed File System
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Horizontal Distributed File System
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Question 2 of 10

2. Question

What is the main role of HDFS in Hadoop?

Manage network connections
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Perform real-time analytics
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Store large files in a distributed and fault-tolerant way
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Visualize data using charts
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Question 3 of 10

3. Question

What is the default replication factor in HDFS?

1
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2
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3
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5
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Question 4 of 10

4. Question

In HDFS, what does the NameNode store?

Actual file data
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Metadata like file names, permissions, and block locations
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Hadoop installation logs
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User passwords
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Question 5 of 10

5. Question

Which node in HDFS stores the actual data blocks?

NameNode
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DataNode
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Secondary NameNode
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ResourceManager
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Question 6 of 10

6. Question

What happens if a DataNode fails in HDFS?

The system crashes completely
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The file becomes unreadable
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HDFS uses replica blocks from other nodes to recover the data
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All blocks are deleted
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Question 7 of 10

7. Question

What is the default block size in HDFS (as of Hadoop 2.x and later)?

64 KB
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64 MB
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128 MB
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1 GB
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Question 8 of 10

8. Question

What is the role of the Secondary NameNode in HDFS?

Acts as a backup for NameNode in case of failure
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Stores data blocks
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Merges edit logs with file system image to help NameNode
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Runs MapReduce jobs
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Question 9 of 10

9. Question

Which command is used to upload a file from local system to HDFS?

hdfs upload
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hadoop push
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hdfs dfs -put
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hdfs copy
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Question 10 of 10

10. Question

How does HDFS ensure data reliability?

Through regular backups
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By compressing all files
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Using data encryption
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By replicating blocks across multiple DataNodes
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