Deuxfleurs/garage
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New model for buckets #172

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lx merged 19 commits from new-buckets into main 2022-01-10 11:32:42 +00:00
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1
Cargo.nix
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@ -638,6 +638,7 @@ in
rand = rustPackages."registry+https://github.com/rust-lang/crates.io-index".rand."0.8.4" { inherit profileName; };
rmp_serde = rustPackages."registry+https://github.com/rust-lang/crates.io-index".rmp-serde."0.15.5" { inherit profileName; };
serde = rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde."1.0.130" { inherit profileName; };
serde_bytes = rustPackages."registry+https://github.com/rust-lang/crates.io-index".serde_bytes."0.11.5" { inherit profileName; };
sled = rustPackages."registry+https://github.com/rust-lang/crates.io-index".sled."0.34.7" { inherit profileName; };
structopt = rustPackages."registry+https://github.com/rust-lang/crates.io-index".structopt."0.3.23" { inherit profileName; };
tokio = rustPackages."registry+https://github.com/rust-lang/crates.io-index".tokio."1.12.0" { inherit profileName; };

11
src/util/crdt/crdt.rs
View file

@ -28,6 +28,17 @@ pub trait Crdt {
fn merge(&mut self, other: &Self);
}
/// Option<T> implements Crdt for any type T, even if T doesn't implement CRDT itself: when
/// different values are detected, they are always merged to None. This can be used for value
/// types which shoulnd't be merged, instead of trying to merge things when we know we don't want
/// to merge them (which is what the AutoCrdt trait is used for most of the time). This cases
/// arises very often, for example with a Lww or a LwwMap: the value type has to be a CRDT so that
/// we have a rule for what to do when timestamps aren't enough to disambiguate (in a distributed
/// system, anything can happen!), and with AutoCrdt the rule is to make an arbitrary (but
/// determinstic) choice between the two. When using an Option<T> instead with this impl, ambiguity
/// cases are explicitely stored as None, which allows us to detect the ambiguity and handle it in
/// the way we want. (this can only work if we are happy with losing the value when an ambiguity
/// arises)
impl<T> Crdt for Option<T>
where
T: Eq,