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docs: restructure K8s migration spec into two phases

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Per user feedback, split into two phases:

Phase 1 (this task): Merged deployment to reduce cost. All services in single topfans namespace, single gateway, external DB (RDS/ElastiCache), HPA for high-load services. Focus on getting off single VM and using K8s elasticity.

Phase 2 (future, not in this task): Per-group namespace isolation. Triggered by scale/isolation needs. Sketch included as future reference.

Removed from this spec (moved to Phase 2 or out of scope):
- per-group namespace architecture (was the original main design)
- ResourceQuota / LimitRange
- per-group gateway with cross-ns Dubbo
- application-layer group_id changes
- new services (admin/review/ai-*) implementation

Updated:
- Section 0: New 'Phased Strategy' section at top
- Section 2: Three candidates reframed for Phase 1 (don't migrate / single-namespace / per-group from day 1)
- Section 4: Detailed design is now single-namespace with all services merged
- Section 5: Single chart (topfans/) instead of two (topfans-shared + topfans-group)
- Section 6: Migration plan is Phase 1 only
- Section 10: Refinements trimmed to Phase 1-relevant items
- Section 11 (NEW): Phase 2 future design sketch for reference
This commit is contained in:
zheng020 2026-06-08 17:14:53 +08:00
parent ebe4a622d8
commit 4db796f407
1 changed files with 467 additions and 345 deletions
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