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docs: add the implementation plan for issue #7

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Five tasks, with the ARCHITECTURE section 6.1 revision first so the code
never contradicts the single source of truth, and the reparenting kept
atomic because scope is a required keyword argument and any split would
leave an unrunnable tree.

The Codex review caught that the planned test evidence pointed at the
wrong stubs: the ones at test_backpressure.py:176-186 cover accounting-side
degradation, not the three gate paths that actually leak to callers, and
try_acquire and try_enter have no stub at all.
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iomgaa
2026-08-06 04:11:17 -04:00
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research-wiki/designs/governance-backend-error.md
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@@ -15,7 +15,7 @@ date: 2026-08-06
| 决策 | 选定 | 关键理由 |
|---|---|---|
| A 类型树 | `GovernanceBackendError` 改继承 `GatewayUnavailableError`,`SCOPE_REASONS` 增 `governance_backend_down`,`reason` 恒为该值 | 加父类是**扩大**不是破坏(既有 `except GovernanceBackendError` 照旧命中);库内仅 `telemetry.py:210` 一处捕父类且已并列写两者,**零回归** |
| A 类型树 | `GovernanceBackendError` 改继承 `GatewayUnavailableError`,`SCOPE_REASONS` 增 `governance_backend_down`,`reason` 恒为该值 | 加父类是**扩大**不是破坏(既有 `except GovernanceBackendError` 照旧命中);库内仅 `telemetry.py:250` 一处捕父类且已并列写两者,**零回归** |
| B `retry_after_s` | 模块常量 `GOVERNANCE_BACKEND_RETRY_AFTER_S = 5.0`,非环境配置项 | 后端恢复时间物理上不可知(不同于熔断冷却有确定到期时刻);取 0 会让积压任务零延迟批量重投,把一次故障放大成风暴 |
| C scope 来源 | 后端层用 `self._scope`;`QuotaGate`/`BreakerGate` 构造函数注入,三处装配(`retry.py`/`ocr.py`/`embedding.py`)各传一行 | 两个包装器是后端异常的唯一入口,注入点收敛;三处装配本就持有 `self._scope` |
| D 未知源拆分 | `_cfg()` 的 2 处改抛新增的 `SourceNotConfiguredError`,**有意不放在** `GatewayUnavailableError` 之下 | 那是装配缺陷不是后端故障;随整类归入"可重投"会让配置写错的任务永远重投、永不进死信——本 issue 要修的 bug 的镜像 |