From b44d3fc796484a50cd6854f20c9b46e5fddedc9d Mon Sep 17 00:00:00 2001 From: Alex Date: Wed, 8 Jun 2022 10:01:44 +0200 Subject: Abstract database behind generic interface and implement alternative drivers (#322) - [x] Design interface - [x] Implement Sled backend - [x] Re-implement the SledCountedTree hack ~~on Sled backend~~ on all backends (i.e. over the abstraction) - [x] Convert Garage code to use generic interface - [x] Proof-read converted Garage code - [ ] Test everything well - [x] Implement sqlite backend - [x] Implement LMDB backend - [ ] (Implement Persy backend?) - [ ] (Implement other backends? (like RocksDB, ...)) - [x] Implement backend choice in config file and garage server module - [x] Add CLI for converting between DB formats - Exploit the new interface to put more things in transactions - [x] `.updated()` trigger on Garage tables Fix #284 **Bugs** - [x] When exporting sqlite, trees iterate empty?? - [x] LMDB doesn't work **Known issues for various back-ends** - Sled: - Eats all my RAM and also all my disk space - `.len()` has to traverse the whole table - Is actually quite slow on some operations - And is actually pretty bad code... - Sqlite: - Requires a lock to be taken on all operations. The lock is also taken when iterating on a table with `.iter()`, and the lock isn't released until the iterator is dropped. This means that we must be VERY carefull to not do anything else inside a `.iter()` loop or else we will have a deadlock! Most such cases have been eliminated from the Garage codebase, but there might still be some that remain. If your Garage-over-Sqlite seems to hang/freeze, this is the reason. - (adapter uses a bunch of unsafe code) - Heed (LMDB): - Not suited for 32-bit machines as it has to map the whole DB in memory. - (adpater uses a tiny bit of unsafe code) **My recommendation:** avoid 32-bit machines and use LMDB as much as possible. **Converting databases** is actually quite easy. For example from Sled to LMDB: ```bash cd src/db cargo run --features cli --bin convert -- -i path/to/garage/meta/db -a sled -o path/to/garage/meta/db.lmdb -b lmdb ``` Then, just add this to your `config.toml`: ```toml db_engine = "lmdb" ``` Co-authored-by: Alex Auvolat Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/322 Co-authored-by: Alex Co-committed-by: Alex --- src/table/Cargo.toml | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'src/table/Cargo.toml') diff --git a/src/table/Cargo.toml b/src/table/Cargo.toml index ed1a213f..6de37cda 100644 --- a/src/table/Cargo.toml +++ b/src/table/Cargo.toml @@ -14,6 +14,7 @@ path = "lib.rs" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [dependencies] +garage_db = { version = "0.8.0", path = "../db" } garage_rpc = { version = "0.7.0", path = "../rpc" } garage_util = { version = "0.7.0", path = "../util" } @@ -25,8 +26,6 @@ hexdump = "0.1" tracing = "0.1.30" rand = "0.8" -sled = "0.34" - rmp-serde = "0.15" serde = { version = "1.0", default-features = false, features = ["derive", "rc"] } serde_bytes = "0.11" -- cgit v1.2.3 From 48ffaaadfc790142ed9556f5227913fa8c32d2ed Mon Sep 17 00:00:00 2001 From: Alex Auvolat Date: Tue, 6 Sep 2022 16:47:56 +0200 Subject: Bump versions to 0.8.0 (compatibility is broken already) --- src/table/Cargo.toml | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'src/table/Cargo.toml') diff --git a/src/table/Cargo.toml b/src/table/Cargo.toml index 6de37cda..ae52e8d7 100644 --- a/src/table/Cargo.toml +++ b/src/table/Cargo.toml @@ -1,6 +1,6 @@ [package] name = "garage_table" -version = "0.7.0" +version = "0.8.0" authors = ["Alex Auvolat "] edition = "2018" license = "AGPL-3.0" @@ -15,8 +15,8 @@ path = "lib.rs" [dependencies] garage_db = { version = "0.8.0", path = "../db" } -garage_rpc = { version = "0.7.0", path = "../rpc" } -garage_util = { version = "0.7.0", path = "../util" } +garage_rpc = { version = "0.8.0", path = "../rpc" } +garage_util = { version = "0.8.0", path = "../util" } opentelemetry = "0.17" -- cgit v1.2.3 From 1f7b050b7dd975642c8cd5d8a7562d347cfa528d Mon Sep 17 00:00:00 2001 From: Alex Auvolat Date: Tue, 20 Sep 2022 11:49:48 +0200 Subject: Change a warn! into a debug! --- src/table/Cargo.toml | 1 + 1 file changed, 1 insertion(+) (limited to 'src/table/Cargo.toml') diff --git a/src/table/Cargo.toml b/src/table/Cargo.toml index ae52e8d7..38c6b41c 100644 --- a/src/table/Cargo.toml +++ b/src/table/Cargo.toml @@ -22,6 +22,7 @@ opentelemetry = "0.17" async-trait = "0.1.7" bytes = "1.0" +hex = "0.4" hexdump = "0.1" tracing = "0.1.30" rand = "0.8" -- cgit v1.2.3