protobuf: use COW feature to reduce heap allocation

描述

貢獻者指南

技術棧

rust

領域

databaseperformance

議題類型

performance

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。

1-2 days

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。

blocked

清晰度議題是否清楚說明預期改動、驗收標準和下一步。

mostly clear

前置要求

Rustprotobufcopy on write pattern

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。

20

研究方向

The issue is assigned and has no recent activity. The suggested approach is to adopt COW from rust protobuf. First, check if the assignee is still working on it. Then, examine the current protobuf implementation in TiKV to find places where strings and bytes are allocated and could benefit from COW. The linked repository (stepancheg/rust protobuf) demonstrates COW usage. Also look at TiKV's relevant protobuf files, e.g., under 'src/server/grpc' or 'components/pd client'. Consider whether the optimization is still needed with newer protobuf versions.