build-train: fast-path hash checks with mtime/size stats
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 1-2 天
- 新手友好度
- 45/100
- Issue 类型
- 功能
- 描述清晰度
- 描述清楚
- 活跃度
- 活跃
- 技术栈
- node.js, typescript
调研方向
Start with workspace.ts:339 and trace memberInputHash, hashWorkspaceTree, and recordBuilt; first check how #480 narrows the input files, since this issue is blocked by it. Add tests for unchanged, touched, added, deleted, and manifest-free trees, and verify old cache entries invalidate; done means matching stats reuse the hash while mismatches trigger a full rehash.
由索引模型根据 Issue 内容生成。
描述
What to build
Every staleness judgement re-reads and hashes every file in every member's tree (memberInputHash → hashWorkspaceTree, workspace.ts:339). Turbo's trick avoids this: persist a per-file mtime/size manifest alongside the hash; if no file's stats changed since the recorded hash, skip rehashing the tree entirely.
.bos/build-cache.json already persists per-member state — extend the cache entry with a stats manifest:
{
"every-plugin": {
"hash": "...",
"files": { "src/index.ts": [1700000000000, 4021], ... } // mtimeMs, size
}
}
Fast path: walk the tree collecting stats only (cheap), compare against the manifest — exact match → reuse the recorded input hash without reading file contents. Any mismatch (new/removed/changed file, or no manifest) → full rehash as today. A stats match with changed content and unchanged mtime+size is theoretically possible but the same residual risk Turbo accepts; mismatches always rehash, never false-fresh.
Cache versioning: bump the cache entry shape (or add a version field) so pre-change caches invalidate cleanly rather than half-matching.
Blocked by
#480 (the input manifest defines what files even get stat'd — build on the narrowed input set).
Status
- Stats-manifest persisted in the cache entry post-build (
recordBuilt) - Fast path skips content reads when stats match; falls back to full rehash otherwise
- Cache shape versioning handles pre-existing
.bos/build-cache.json - Unit tests: unchanged tree (skip), touched file (rehash), new/deleted file (rehash), missing manifest (rehash)
- Changeset added
- 主要语言
- TypeScript
- 星标
- 5
- 派生
- 3
- 平均合并
- 9 小时 37 分钟
- 30 天内合并 PR
- 157
环境准备
- 提供 Dockerfile 或 Docker Compose 文件
- 没有 Pull Request 模板
- 阅读贡献指南
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- Fork 仓库，在一个分支上完成修改。
- 提交 Pull Request，并在描述里引用这个 Issue 编号。
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