Development Task

• Overall refactor
  • Refactor TSO forward/dispatcher to be shared by both PD and TSO #6175 @binshi-bing
• Add basic multi-keyspace-group management #6214 @binshi-bing
• Load initial assignment and dynamically watch/apply keyspace groups' membership/distribution change #6247 @binshi-bing
• Apply multi-keyspace-group membership to tso service and handle inconsistency issue #6282 @binshi-bing
  • follow-up pr Improve lock mechanism in tso.KeyspaceGroupManager #6305 @binshi-bing
  • follow-up pr bootstrap default keyspace group in the tso service #6306 @binshi-bing
• Support keyspace group 0 split into multiple keyspace groups @JmPotato
  • keyspace, api: support the keyspace group split #6293 @JmPotato
    • (follow-up pr) keyspace: add split-from field for endpoint.KeyspaceGroup #6309
  • tso, member: support TSO split based on keyspace group split #6313 @JmPotato
• mcs, tso: support multi-keyspace-group and its service discovery in E2E path #6321 @binshi-bing
  • Add FindGroupByKeyspaceID rpc in TSO service. pingcap/kvproto#1101

Issues: Ref #5895