Alex
b44d3fc796
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- [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 <alex@adnab.me> Reviewed-on: #322 Co-authored-by: Alex <alex@adnab.me> Co-committed-by: Alex <alex@adnab.me>
37 lines
787 B
TOML
37 lines
787 B
TOML
[package]
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name = "garage_db"
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version = "0.8.0"
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authors = ["Alex Auvolat <alex@adnab.me>"]
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edition = "2018"
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license = "AGPL-3.0"
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description = "Abstraction over multiple key/value storage engines that supports transactions"
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repository = "https://git.deuxfleurs.fr/Deuxfleurs/garage"
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readme = "../../README.md"
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[lib]
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path = "lib.rs"
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[[bin]]
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name = "convert"
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path = "bin/convert.rs"
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required-features = ["cli"]
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[dependencies]
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err-derive = "0.3"
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hexdump = "0.1"
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log = "0.4"
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heed = "0.11"
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rusqlite = { version = "0.27", features = ["bundled"] }
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sled = "0.34"
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# cli deps
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clap = { version = "3.1.18", optional = true, features = ["derive", "env"] }
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pretty_env_logger = { version = "0.4", optional = true }
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[dev-dependencies]
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mktemp = "0.4"
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[features]
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cli = ["clap", "pretty_env_logger"]
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