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https://github.com/fawney19/Aether.git
synced 2026-01-12 04:28:28 +08:00
feat: 流式预读增强与自适应并发算法优化
流式预读增强: - 新增预读字节上限(64KB),防止无换行响应导致内存增长 - 预读结束后检测非 SSE 格式的错误响应(HTML 页面、纯 JSON 错误) - 抽取 check_html_response 和 check_prefetched_response_error 到 utils.py 自适应并发算法优化(边界记忆 + 渐进探测): - 缩容策略:从乘性减少改为边界 -1,一次 429 即可收敛到真实限制附近 - 扩容策略:普通扩容不超过已知边界,探测性扩容可谨慎突破(每次 +1) - 仅在并发限制 429 时记录边界,避免 RPM/UNKNOWN 类型覆盖
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@@ -1,14 +1,16 @@
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"""
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自适应并发调整器 - 基于滑动窗口利用率的并发限制调整
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自适应并发调整器 - 基于边界记忆的并发限制调整
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核心改进(相对于旧版基于"持续高利用率"的方案):
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- 使用滑动窗口采样,容忍并发波动
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- 基于窗口内高利用率采样比例决策,而非要求连续高利用率
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- 增加探测性扩容机制,长时间稳定时主动尝试扩容
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核心算法:边界记忆 + 渐进探测
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- 触发 429 时记录边界(last_concurrent_peak),这就是真实上限
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- 缩容策略:新限制 = 边界 - 1,而非乘性减少
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- 扩容策略:不超过已知边界,除非是探测性扩容
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- 探测性扩容:长时间无 429 时尝试突破边界
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AIMD 参数说明:
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- 扩容:加性增加 (+INCREASE_STEP)
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- 缩容:乘性减少 (*DECREASE_MULTIPLIER,默认 0.85)
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设计原则:
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1. 快速收敛:一次 429 就能找到接近真实的限制
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2. 避免过度保守:不会因为多次 429 而无限下降
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3. 安全探测:允许在稳定后尝试更高并发
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"""
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from datetime import datetime, timezone
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@@ -35,21 +37,21 @@ class AdaptiveConcurrencyManager:
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"""
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自适应并发管理器
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核心算法:基于滑动窗口利用率的 AIMD
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- 滑动窗口记录最近 N 次请求的利用率
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- 当窗口内高利用率采样比例 >= 60% 时触发扩容
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- 遇到 429 错误时乘性减少 (*0.85)
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- 长时间无 429 且有流量时触发探测性扩容
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核心算法:边界记忆 + 渐进探测
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- 触发 429 时记录边界(last_concurrent_peak = 触发时的并发数)
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- 缩容:新限制 = 边界 - 1(快速收敛到真实限制附近)
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- 扩容:不超过边界(即 last_concurrent_peak),允许回到边界值尝试
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- 探测性扩容:长时间(30分钟)无 429 时,可以尝试 +1 突破边界
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扩容条件(满足任一即可):
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1. 滑动窗口扩容:窗口内 >= 60% 的采样利用率 >= 70%,且不在冷却期
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2. 探测性扩容:距上次 429 超过 30 分钟,且期间有足够请求量
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1. 利用率扩容:窗口内高利用率比例 >= 60%,且当前限制 < 边界
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2. 探测性扩容:距上次 429 超过 30 分钟,可以尝试突破边界
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关键特性:
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1. 滑动窗口容忍并发波动,不会因单次低利用率重置
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2. 区分并发限制和 RPM 限制
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3. 探测性扩容避免长期卡在低限制
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4. 记录调整历史
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1. 快速收敛:一次 429 就能学到接近真实的限制值
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2. 边界保护:普通扩容不会超过已知边界
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3. 安全探测:长时间稳定后允许尝试更高并发
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4. 区分并发限制和 RPM 限制
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"""
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# 默认配置 - 使用统一常量
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@@ -59,7 +61,6 @@ class AdaptiveConcurrencyManager:
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# AIMD 参数
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INCREASE_STEP = ConcurrencyDefaults.INCREASE_STEP
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DECREASE_MULTIPLIER = ConcurrencyDefaults.DECREASE_MULTIPLIER
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# 滑动窗口参数
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UTILIZATION_WINDOW_SIZE = ConcurrencyDefaults.UTILIZATION_WINDOW_SIZE
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@@ -115,7 +116,13 @@ class AdaptiveConcurrencyManager:
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# 更新429统计
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key.last_429_at = datetime.now(timezone.utc) # type: ignore[assignment]
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key.last_429_type = rate_limit_info.limit_type # type: ignore[assignment]
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key.last_concurrent_peak = current_concurrent # type: ignore[assignment]
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# 仅在并发限制且拿到并发数时记录边界(RPM/UNKNOWN 不应覆盖并发边界记忆)
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if (
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rate_limit_info.limit_type == RateLimitType.CONCURRENT
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and current_concurrent is not None
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and current_concurrent > 0
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):
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key.last_concurrent_peak = current_concurrent # type: ignore[assignment]
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# 遇到 429 错误,清空利用率采样窗口(重新开始收集)
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key.utilization_samples = [] # type: ignore[assignment]
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@@ -207,6 +214,9 @@ class AdaptiveConcurrencyManager:
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current_limit = int(key.learned_max_concurrent or self.DEFAULT_INITIAL_LIMIT)
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# 获取已知边界(上次触发 429 时的并发数)
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known_boundary = key.last_concurrent_peak
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# 计算当前利用率
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utilization = float(current_concurrent / current_limit) if current_limit > 0 else 0.0
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@@ -217,22 +227,29 @@ class AdaptiveConcurrencyManager:
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samples = self._update_utilization_window(key, now_ts, utilization)
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# 检查是否满足扩容条件
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increase_reason = self._check_increase_conditions(key, samples, now)
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increase_reason = self._check_increase_conditions(key, samples, now, known_boundary)
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if increase_reason and current_limit < self.MAX_CONCURRENT_LIMIT:
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old_limit = current_limit
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new_limit = self._increase_limit(current_limit)
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is_probe = increase_reason == "probe_increase"
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new_limit = self._increase_limit(current_limit, known_boundary, is_probe)
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# 如果没有实际增长(已达边界),跳过
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if new_limit <= old_limit:
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return None
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# 计算窗口统计用于日志
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avg_util = sum(s["util"] for s in samples) / len(samples) if samples else 0
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high_util_count = sum(1 for s in samples if s["util"] >= self.UTILIZATION_THRESHOLD)
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high_util_ratio = high_util_count / len(samples) if samples else 0
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boundary_info = f"边界: {known_boundary}" if known_boundary else "无边界"
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logger.info(
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f"[INCREASE] {increase_reason}: Key {key.id[:8]}... | "
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f"窗口采样: {len(samples)} | "
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f"平均利用率: {avg_util:.1%} | "
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f"高利用率比例: {high_util_ratio:.1%} | "
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f"{boundary_info} | "
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f"调整: {old_limit} -> {new_limit}"
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)
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@@ -246,13 +263,14 @@ class AdaptiveConcurrencyManager:
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high_util_ratio=round(high_util_ratio, 2),
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sample_count=len(samples),
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current_concurrent=current_concurrent,
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known_boundary=known_boundary,
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)
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# 更新限制
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key.learned_max_concurrent = new_limit # type: ignore[assignment]
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# 如果是探测性扩容,更新探测时间
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if increase_reason == "probe_increase":
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if is_probe:
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key.last_probe_increase_at = now # type: ignore[assignment]
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# 扩容后清空采样窗口,重新开始收集
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@@ -303,7 +321,11 @@ class AdaptiveConcurrencyManager:
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return samples
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def _check_increase_conditions(
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self, key: ProviderAPIKey, samples: List[Dict[str, Any]], now: datetime
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self,
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key: ProviderAPIKey,
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samples: List[Dict[str, Any]],
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now: datetime,
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known_boundary: Optional[int] = None,
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) -> Optional[str]:
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"""
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检查是否满足扩容条件
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@@ -312,6 +334,7 @@ class AdaptiveConcurrencyManager:
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key: API Key对象
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samples: 利用率采样列表
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now: 当前时间
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known_boundary: 已知边界(触发 429 时的并发数)
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Returns:
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扩容原因(如果满足条件),否则返回 None
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@@ -320,15 +343,25 @@ class AdaptiveConcurrencyManager:
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if self._is_in_cooldown(key):
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return None
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# 条件1:滑动窗口扩容
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current_limit = int(key.learned_max_concurrent or self.DEFAULT_INITIAL_LIMIT)
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# 条件1:滑动窗口扩容(不超过边界)
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if len(samples) >= self.MIN_SAMPLES_FOR_DECISION:
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high_util_count = sum(1 for s in samples if s["util"] >= self.UTILIZATION_THRESHOLD)
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high_util_ratio = high_util_count / len(samples)
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if high_util_ratio >= self.HIGH_UTILIZATION_RATIO:
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return "high_utilization"
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# 检查是否还有扩容空间(边界保护)
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if known_boundary:
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# 允许扩容到边界值(而非 boundary - 1),因为缩容时已经 -1 了
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if current_limit < known_boundary:
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return "high_utilization"
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# 已达边界,不触发普通扩容
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else:
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# 无边界信息,允许扩容
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return "high_utilization"
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# 条件2:探测性扩容(长时间无 429 且有流量)
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# 条件2:探测性扩容(长时间无 429 且有流量,可以突破边界)
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if self._should_probe_increase(key, samples, now):
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return "probe_increase"
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@@ -406,32 +439,65 @@ class AdaptiveConcurrencyManager:
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current_concurrent: Optional[int] = None,
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) -> int:
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"""
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减少并发限制
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减少并发限制(基于边界记忆策略)
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策略:
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- 如果知道当前并发数,设置为当前并发的70%
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- 否则,使用乘性减少
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- 如果知道触发 429 时的并发数,新限制 = 并发数 - 1
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- 这样可以快速收敛到真实限制附近,而不会过度保守
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- 例如:真实限制 8,触发时并发 8 -> 新限制 7(而非 8*0.85=6)
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"""
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if current_concurrent:
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# 基于当前并发数减少
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new_limit = max(
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int(current_concurrent * self.DECREASE_MULTIPLIER), self.MIN_CONCURRENT_LIMIT
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)
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if current_concurrent is not None and current_concurrent > 0:
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# 边界记忆策略:新限制 = 触发边界 - 1
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candidate = current_concurrent - 1
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else:
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# 乘性减少
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new_limit = max(
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int(current_limit * self.DECREASE_MULTIPLIER), self.MIN_CONCURRENT_LIMIT
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)
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# 没有并发信息时,保守减少 1
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candidate = current_limit - 1
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# 保证不会“缩容变扩容”(例如 current_concurrent > current_limit 的异常场景)
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candidate = min(candidate, current_limit - 1)
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new_limit = max(candidate, self.MIN_CONCURRENT_LIMIT)
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return new_limit
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def _increase_limit(self, current_limit: int) -> int:
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def _increase_limit(
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self,
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current_limit: int,
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known_boundary: Optional[int] = None,
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is_probe: bool = False,
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) -> int:
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"""
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增加并发限制
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增加并发限制(考虑边界保护)
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策略:加性增加 (+1)
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策略:
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- 普通扩容:每次 +INCREASE_STEP,但不超过 known_boundary
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(因为缩容时已经 -1 了,这里允许回到边界值尝试)
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- 探测性扩容:每次只 +1,可以突破边界,但要谨慎
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Args:
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current_limit: 当前限制
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known_boundary: 已知边界(last_concurrent_peak),即触发 429 时的并发数
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is_probe: 是否是探测性扩容(可以突破边界)
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"""
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new_limit = min(current_limit + self.INCREASE_STEP, self.MAX_CONCURRENT_LIMIT)
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if is_probe:
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# 探测模式:每次只 +1,谨慎突破边界
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new_limit = current_limit + 1
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else:
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# 普通模式:每次 +INCREASE_STEP
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new_limit = current_limit + self.INCREASE_STEP
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# 边界保护:普通扩容不超过 known_boundary(允许回到边界值尝试)
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if known_boundary:
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if new_limit > known_boundary:
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new_limit = known_boundary
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# 全局上限保护
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new_limit = min(new_limit, self.MAX_CONCURRENT_LIMIT)
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# 确保有增长(否则返回原值表示不扩容)
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if new_limit <= current_limit:
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return current_limit
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return new_limit
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def _record_adjustment(
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@@ -503,11 +569,16 @@ class AdaptiveConcurrencyManager:
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if key.last_probe_increase_at:
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last_probe_at_str = cast(datetime, key.last_probe_increase_at).isoformat()
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# 边界信息
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known_boundary = key.last_concurrent_peak
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return {
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"adaptive_mode": is_adaptive,
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"max_concurrent": key.max_concurrent, # NULL=自适应,数字=固定限制
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"effective_limit": effective_limit, # 当前有效限制
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"learned_limit": key.learned_max_concurrent, # 学习到的限制
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# 边界记忆相关
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"known_boundary": known_boundary, # 触发 429 时的并发数(已知上限)
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"concurrent_429_count": int(key.concurrent_429_count or 0),
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"rpm_429_count": int(key.rpm_429_count or 0),
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"last_429_at": last_429_at_str,
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