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sapling
Rust2017–2026
meta / sapling

sapling

A Scalable, User-Friendly Source Control System.

59Distinct people
67Mentions
0Explicit recommenders
7.3KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

A Scalable, User-Friendly Source Control System.

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

  • jj-vcs/jj · linked in 2 of the same discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 10:02:05 AM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year67 dated mentions

Observed mentions: 2017-02-08 21:58:08 UTC to 2026-10-17 13:22:50 UTC.

051015202017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments20172018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 8 mentions; 1 submissions, 7 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 18 mentions; 2 submissions, 16 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 13 mentions; 4 submissions, 9 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 9 mentions; 1 submissions, 8 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 8 mentions; 0 submissions, 8 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 5 mentions; 1 submissions, 4 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC110
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC211
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC101
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC817
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC202
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC18216
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC1349
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC918
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC808
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC514

What Hacker News says

8 sources
You might be interested in how this problem was solved by our team at Meta, in EdenFS (https://github.com/facebook/sapling/blob/main/eden/fs/docs/O...) and Watchman: https://github.com/facebook/watchman. What you're describing is reasonably similar to EdenFS, except EdenFS runs in userspace. Watchman layers a consistent view of file metadata on top of inotify (etc), as well as providing stateless queries on top of EdenFS. It acts as a unified interface over regular filesystems as well as Eden that provides file lstat info and hashes over a Unix domain socket. Back in the day, Watchman sped up status queries by over 5x for a repo with hundreds of thousands of files: https://engineering.fb.com/2014/01/07/core-infra/scaling-mer... I worked directly on this and co-wrote this blog post. In truth, getting these two components working to the sta
Read the rest
ndard expected by developers was a very difficult systems problem with a ton of event ordering and cache invalidation concerns. (With EdenFS, in particular, I believe there was machine learning involved to detect prefetch patterns.) For smaller repos, it is much simpler to do linear scans. Since it is really fast on modern hardware anyway, it is also the right thing to do, following the maxim of doing the simplest thing that works.
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