Grokking the System Design Interview, Volume II
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HDFS Characteristics

Active-standby NameNodes solve one kind of scaling problem: staying up through a failure. This lesson covers three more: who may access files, how HDFS scales past one NameNode, and how it trades replicas for cheaper storage. It closes with where HDFS fits well, and where it does not.

Security and permission

HDFS uses a permissions model close to POSIX. Every file and directory has an owner and a group. Each grants separate permissions to the owner, to other members of that group, and to everyone else. There are three permission types:

  1. **Read (`r

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J

Junaid Effendi

· 4 years ago

Need some clarification on Write-once model.

With recent append support, does that mean concurrent write in append mode are supported?

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