“您可以使用 Instant Purge 了!Instant Purge 现在全面开放!”——所有清除方法现已向所有客户全面开放
2025-04-01
继实现了业内最快的清除之后,我们现在提高了所有 Cloudflare 计划中的 Instant Purge 配额。...
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CacheDB 内置的本地队列会对清除操作进行缓冲,既能确保稳定的吞吐量,又可避免延迟激增;而缓存代理会实时查询 CacheDB,以保证快速、主动的清除效果。我们更新后的分发管道直接将清除指令广播至各机器的 CacheDB 实例,使吞吐量和清除速度得到质的飞跃。
采用 CacheDB 后,通过消除惰性清除的存储累积,存储需求降低至原先的 1/10,宝贵的磁盘空间得以即时释放。这些释放的存储空间不但延长了缓存留存时间,提高了缓存命中率,更有效减少了源站出口流量。正是存储优化和吞吐量提升的双重突破,使我们能够将 Instant Purge 系统提供给更多客户使用。
如需进一步了解我们如何设计新的 Instant Purge 系统,请参阅我们清除系列博客文章的往期文章。
\n在具体使用这些新的清除方法时,关键是要根据您想要使其失效的内容选择正确的方法。清除过于激进会向源服务器发送大量不必要的请求,导致源服务器过载,不仅会增加出口流量成本,还可能会导致宕机。反之,清除不足则会让访问者获得过时的内容。因此,在精准度和速度之间取得平衡至关重要。
Cloudflare 支持多种有针对性的清除方法,以帮助客户实现这种平衡。
清除所有内容:清除与网站关联的所有缓存内容。
通过前缀清除:目标是共享一个共同前缀的 URL。
通过主机名清除:通过特定主机名使内容失效。
通过 URL 清除(单个文件清除):精确地以单个 URL 为目标。
从即日开始,所有 Cloudflare 客户都可以使用这些清除方法。
\n用户可以直接在 Cloudflare 仪表板中(位于配置部分中的“缓存”选项卡下)或通过 Cloudflare API 选择清除方法。每个清除请求都应明确指定与所选清除类型相关的目标 URL、主机名、前缀或缓存标记(这些被称为清除键)。例如,前缀清除请求可能会指定一个目录,例如 example.com/foo/bar。为了最大限度地提高效率和吞吐量,建议将多个清除键批量打包在单个请求中发送,而不是为每个清除键单独发送请求。
\nCloudflare 清除(通过标记清除、通过前缀清除、通过主机名清除和清除所有内容)的新速率限制因计划类型而异。我们使用令牌存储桶速率限制系统,因此每个帐户都有一个令牌存储桶,其最大容量取决于计划类型。收到清除请求时,我们首先会根据该帐户上次发出清除请求以来经过的时间,按其计划类型的补充速率(可以是分数令牌)向帐户的存储桶添加令牌。然后我们会检查存储桶中是否有至少一个完整的令牌,如果有,则扣除该令牌并处理清除请求。如果没有,将对清除请求进行速率限制。可以这样简单理解速率限制:补充速率代表用户在指定时段内可发送的稳定请求速率,而令牌存储桶容量则代表可用的最大突发请求量。
例如,一个免费用户开始时的存储桶容量为 25 个请求,补充速率为每分钟 5 个请求(每 12 秒一个请求)。如果用户一次性发送 26 个请求,则前 25 个请求将得到处理,但最后一个请求将受到速率限制。用户需要等待 12 秒钟,然后重试最后一个请求才能成功。
当前限制按帐户应用:
计划 | 存储桶容量 | 请求补充速率 | 每个请求的最大键数 | 键总数 |
Free | 25 个请求 | 5 个/分钟 | 100 | 500 个/分钟 |
Pro | 25 个请求 | 5 个/秒 | 100 | 500 个/秒 |
Biz | 50 个请求 | 10 个/秒 | 100 | 1,000 个/秒 |
Enterprise | 500 次请求 | 50 个/秒 | 100 | 5000 个/秒 |
有关所有清除速率限制的更详细文档,请参阅我们的文档。
\n我们花了很多时间来优化我们的清除平台。但我们不会止步于此。展望未来,我们将继续提高 Cloudflare 的单文件清除性能。当前的 P50 性能约为 250 毫秒,我们预计可以进一步优化到 200 毫秒以下。我们还将增强系统能力,提高所有系统的清除吞吐量,并继续寻找方法实施筛选技术,确保我们能够持续有效地扩展,让客户可以随时清除他们想要清除的任何内容。
诚邀您立即试用我们新的清除系统,为您的访问者提供即时、无缝的体验。
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