[HDDS-7852] SCM Decommissioning Support

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.3.0
• Fix Version/s: 2.0.0
• Component/s: SCM
• Target Version/s: 2.0.0
• Assignee: Nandakumar
• Reporter: Nandakumar
• Created: 30/Jan/23 07:47
• Updated: Yesterday 13:04
• Resolved: Yesterday 13:04

Description

SCM decommissioning is the process in which we gracefully remove one of the SCM from the SCM HA Ring. We will also have the option to remove SCM from the HA Ring forcefully.

Decommissioning will be needed in the following scenarios,
For maintenance and upgrade

• In case of Disk failure
• In case of Node failure

The main areas to consider while performing SCM decommissioning,

• Ratis Layer
• Security Layer

Issue Links

• is required by: HDDS-7202 Document manual SCM recovery on Ozone wiki
• relates to: HDDS-6318 Add option to remove SCM from Ratis Ring
• relates to: HDDS-12018 SCM Decommissioning improvements
• links to: SCM Decommissioning Design

Sub-Tasks

• Add support for RemoveSCM in SCMRatisServer: Resolved
• Add option to remove SCM from Ratis Ring: Resolved
• Fix SCM certificate count check during OM & Datanode startup: Resolved
• Admin SCM command to decommission SCM.: Resolved
• Scm server side RPC support for Scm Decommissioning: Resolved
• Admin SCM decommission command primordial node support: Resolved
• SCM Decommissioning command should exit with non-zero code on failure: Resolved