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Lemmy v0.19.6 Release (join-lemmy.org)

submitted 1 week ago by [email protected] to c/[email protected]

25 comments fedilink hide all child comments

What is Lemmy?

Lemmy is a self-hosted social link aggregation and discussion platform. It is completely free and open, and not controlled by any company. This means that there is no advertising, tracking, or secret algorithms. Content is organized into communities, so it is easy to subscribe to topics that you are interested in, and ignore others. Voting is used to bring the most interesting items to the top.

Changes

This release took a long time to complete due to a major performance problem which brought lemmy.ml to a crawl every time we tried to deploy the new version. It took a lot of testing (in production) to narrow it down to a single commit, and finally fix the problem.

The release itself contains numerous bug fixes and minor improvements:

Lemmy

Enhancements

Parallel federation sending by @phiresky in #4623
Reduce CPU usage for generating link previews by @phiresky in #4957
Switch from OpenSSL to rustls by @kwaa in #4901
Increase max post url length to 2000 characters by @dessalines in #4960
Increase max length of user bio to 1000 charactes by @dessalines #5014
Reduce maximum comment depth to 50 by @nutomic #5009
Resize post thumbnails by @nutomic #5107/files
Add category to RSS feeds by @nutomic #5030
Allow users to view their own removed/deleted communities by @dessalines in #4912
Add backend check to enforce hierarchy of admins and mods by @dessalines in #4860
Do pictrs transformations for proxied image urls by @dessalines in #4895
Enable more build optimizations by @nutomic in #5168
Calculate "controversial" ranking with exponent instead of multiply (just like Reddit) by @dullbananas in #4872
Automatically remove tracking parameters from URLs by @dessalines #5018
Relax timeout for sending activities by @Nothing4You in #4864

Bug Fixes

Fix admin notification for new user registration (fixes #4916) by @Nutomic in #4925
Allow community settings changes by remote mods @flamingo-cant-draw in #4937
Fix problem with connecting to Postgres with TLS @FenrirUnbound in #4910
Fix bug when commenting in local-only community by @dessalines in #4854 and @abdel-m in #4920
Fix scheduled task to delete users with denied applications by @Nothing4You in #4907

API

Return image dimensions and content type in API responses by @dessalines in #4704
Adding a show_read override to GetPosts. by @dessalines in #4846
Add show_nsfw override filter to GetPosts. by @dessalines in #4889
Require authentication for site metadata fetch endpoint by @dessalines in #4968
Add the ability to fetch a registration application by person_id by @dessalines in #4913
Order community posts by published data, not id by @dullbananas in #4859
Throw error when non-mod posts to mod-only comm or when URL is blocked by @flamingo-cant-draw in #4966
Add option to search exclusively by post title by Carlos-Cabello #5015

Database

Approve applications in transaction by @Nothing4You in #4970
Use trigger to generate apub URL in insert instead of update, and fix query planner options not being set when TLS is disabled by @dullbananas in #4797

Lemmy-UI

Fix full-size post images. by @dessalines in #2797
Fix modlog ID filtering. by @dessalines in #2795
Allow Arabic and Cyrillic characters when signing up or creating community by @SleeplessOne1917
UX - Swap "Select Language" and "Cancel/Preview/Reply" button locations around in commentsReverse order of buttons in Reply TextArea
Fix jump to content by @SleeplessOne1917
Fixing peertube and ordinary video embeds. by @dessalines in #2676
Changing sameSite cookie from Strict to Lax. by @dessalines in #2677
Remove show new post notifs setting. by @dessalines in #2675
Fix memory leak around emojis on server render by @makotech222 in #2674
Enable spellcheck for markdown text area by @SleeplessOne1917 in #2669
Pre release dep bump by @SleeplessOne1917 in #2661
Add ability to fill magnet link title on post creation. by @dessalines in #2654
Registration application view by @SleeplessOne1917 in #2651
Add torrent help by @dessalines in #2650
More moderation history by @dessalines in #2649
Fix tribute related bug by @SleeplessOne1917 in #2647
Remove min and max length from password input when using login form by @SleeplessOne1917 in #2643
Remove trending communities card from home. by @dessalines in #2639
Set data-bs-theme based on the presence of "dark" in theme name by @SleeplessOne1917 in #2638
Fixing modlog filtering to allow admins and mods to filter by mod. by @dessalines in #2629
Fix issue from logo bugfix by @SleeplessOne1917 in #2620
Make more post params cross-postable by @SleeplessOne1917 in #2621
Fix wonky comment action icon button alignment by @SleeplessOne1917 in #2622
Prevent broken logo from crashing site by @SleeplessOne1917 in #2619
Add rate limit info message. by @dessalines in #2563
Fix getQueryString by @matc-pub in #2558

New Contributors

@abdel-m made their first contribution in #4920
@johnspurlock made their first contribution in #4917
@FenrirUnbound made their first contribution in #4910
@kwaa made their first contribution in #4901
@Daniel15 made their first contribution in #4892

Full Changelog

Upgrade instructions

This upgrade could take as long as ~30 minutes for larger servers, due to needing to recalculate controversy ranks for all historical posts.

There are no breaking changes with this release.

Follow the upgrade instructions for ansible or docker.

If you need help with the upgrade, you can ask in our support forum or on the Matrix Chat.

Thanks to everyone

We'd like to thank our many contributors and users of Lemmy for coding, translating, testing, and helping find and fix bugs. We're glad many people find it useful and enjoyable enough to contribute.

Special shout out to @SleeplessOne1917, @phiresky, @dullbananas, @mv-gh, @Nothing4u, @asonix, @sunaurus, @flamingo-cant-draw, and @Freakazoid182 for their many code contributions and helpful insights.

Support development

We (@dessalines and @nutomic) have been working full-time on Lemmy for over five years. This is largely thanks to support from NLnet foundation, as well as donations from individual users.

If you like using Lemmy, and want to make sure that we will always be available to work full time building it, consider donating to support its development. A recurring donation is the best way to ensure that open-source software like Lemmy can stay independent and alive, and helps us grow our little developer co-op to support more full-time developers.

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[–] [email protected] 8 points 1 week ago (2 children)

What was the bug in the end out of curiosity?

[–] [email protected] 9 points 1 week ago* (last edited 1 week ago) (1 children)

I increased the size of a postgres DB column, and it grinded every query on the table to a halt. Turns out we needed to run analyze on the column.

I opened up an issue on the postgres issue tracker because I've never seen anything like this before, and I'm sure we're not the only one to run into this production-breaking migration.

[–] [email protected] 3 points 1 week ago

Very interesting

[–] [email protected] 17 points 1 week ago (1 children)

Changing post.url from varchar(512) to varchar(2000) really messed up database performance so lemmy.ml became unusable. Turns out that column statistics are removed when the type is changed, so we had to run analyze as part of the migration. Seems like a bug in postgres.

https://github.com/LemmyNet/lemmy/issues/4983#issuecomment-2446945046

[–] [email protected] 11 points 1 week ago

Very strange that such a change could lead to such a problem, but sometimes databases are weird black boxes like that 🤷