[SCB-2773] Change mutil dicovery registry instance merge policy

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: java-chassis-3.0.0, java-chassis-2.8.13
• Component/s: Java-Chassis
• Assignee: liubao
• Reporter: liubao
• Created: 20/Feb/23 08:46
• Updated: 22/Feb/23 01:24
• Resolved: 22/Feb/23 01:24

Description

Before:

   merge all instances from different discoveries together. 

 

  Problem: Discovery implementation has different revision mechanism, we can not know when revision should updated.

 

After:

   By default, find instances from discovery implementations by order, if find, return the first, or find next. 

   And add a configuration `servicecomb.service.registry.preferred.{service-name}`  to find only the registry implementation. 

 

Issue Links

• links to: GitHub Pull Request #3650
• links to: GitHub Pull Request #3651