Written by @dessalines and @nutomic, 2021-04-05
Since our last release in February, we’ve had ~150 commits to Lemmy. The biggest changes, as we’ll outline below, are a split of Lemmy’s user tables into federated and local tables, necessitating a v3
of Lemmy’s API, federated moderation, i18n support in join.lemmy.ml, and lots of back-end cleanup.
user_
into person
and local_user
tables.i32
as ids.Important: there are multiple breaking changes:
LEMMY_CONFIG_LOCATION
).allowed_instances
and blocked_instances
has changed, and you need to adjust your config file manually:
allowed_instances: ds9.lemmy.ml,enterprise.lemmy.ml
allowed_instances: ["ds9.lemmy.ml", "enterprise.lemmy.ml"]
, and only one of the allowed_instances
or blocked_instances
blocks can be set.v2
to v3
, so all clients need to be updated: lemmy-js-client: 0.9.9 -> 0.10.0 .If you’d like to make a DB backup before upgrading, follow this guide.
To upgrade your instance to v0.10.0
, simply follow the instructions in the documentation:
v0.9.0 (Rust 1.47) | v0.10.0 (Rust 1.47) | v0.10.0 (Rust 1.51) | |
---|---|---|---|
Clean | 140s | 146s | 119s |
Incremental | 28s | 22s | 19s |
Despite ongoing efforts to speed up compilation, it has actually gotten slower when comparing with the same Rust version. Only thanks to improvements in newer Rust versions has our build process gotten faster. This could be simply because we added more code, while Lemmy v0.9.0 had 22.4k lines of Rust, v0.10.0 has 23.8k (an increase of 6%).
v0.9.0 build graph:
v0.10.0 build graph:
We extracted the crates lemmy_api_crud
and lemmy_apub_receive
from lemmy_api
and lemmy_apub
, respectively, and renamed lemmy_structs
to lemmy_api_common
. In the second graph you can see how parts of the api and apub crates are now built nicely in parallel, speeding up builds on multi-core systems.
On the other hand, some crates have gotten much slower to compile, in particular lemmy_db_queries
(6.5s slower), lemmy_apub
(6.5s slower if we include lemmy_apub_receive
). And lemmy_db_views
is quite slow, just as before.