[HDFS-11035] Better documentation for maintenace mode and upgrade domain

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.9.0
• Fix Version/s: 2.9.0, 3.0.0-beta1, 3.1.0
• Component/s: datanode, documentation
• Target Version/s: 2.9.0
• Hadoop Flags: Reviewed
• Assignee: Ming Ma
• Reporter: Wei-Chiu Chuang
• Created: 19/Oct/16 18:27
• Updated: 02/Oct/19 17:14
• Resolved: 20/Sep/17 16:56

Description

HDFS-7541 added upgrade domain and HDFS-7877 added maintenance mode. Existing documentation about these two features are scarce and the implementation have evolved from the original design doc. Looking at code and Javadoc and I still don't quite get how I can get datanodes into maintenance mode/ set up a upgrade domain.

File this jira to propose that we write an up-to-date description of these two features.