imsnif/bandwhich

Retry DNS only after timeout

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#127 建立於 2020年1月16日

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 (5 留言) (0 反應) (0 負責人)Rust (7,686 star) (237 fork)batch import
good first issuehelp wanted

描述

Right now, when we do our reverse-dns queries (getting the hostname of an ip address), if the request failed, we retry immediately. This can cause a lot of connections (also visible in the app!) to be opened if a request repeatedly fails.

It would be nice if we have some sort of progressive backoff mechanism for this... something like: wait for 1 second before retrying, then wait for 2, 4, etc.

貢獻者指南

技術棧
rust
領域
backendperformance
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
basic Rust knowledgeunderstanding of DNS resolutionfamiliarity with retry/backoff concepts
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
50
研究方向
Examine the current DNS reverse lookup logic in bandwhich (likely in the dns module). Implement an exponential backoff strategy for retries: start at 1 second, then double after each failure. Ensure the backoff resets on success. Add configurable max delay and optional jitter. Test with simulated failures.