scrapy/scrapy

Improve DNS caching

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#905 创建于 2014年9月25日

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 (8 评论) (0 反应) (0 负责人)Python (61,658 star) (11,547 fork)batch import
enhancementhelp wantedin progresspatch available

描述

Currently, Scrapy does caching of DNS by default (setting DNSCACHE_ENABLED is True on default settings).

The current cache implementation does not implement an expiration for the entries which may result in entries that be kept ad infinitum. We need change the current implementation to set an expiration time by default (typical TTL is 86400 seconds -24 hours-) or maybe, customizable by a setting.

贡献者指南

技术栈
python
领域
backendperformance
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-3 hours
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
PythonScrapy basicsCaching concepts
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
65
研究方向
Investigate the current DNS caching implementation in Scrapy, likely in the downloader middleware or resolver module. Look for the DNSCACHE ENABLED setting and the cache dictionary. Implement an expiration time (TTL) for cached entries, defaulting to 86400 seconds, and consider making it configurable via a new setting. Test with various TTL values to ensure compatibility.