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* Abstract database behind generic interface and implement alternative drivers ↵Alex2022-06-081-50/+51
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (#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 <alex@adnab.me> Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/322 Co-authored-by: Alex <alex@adnab.me> Co-committed-by: Alex <alex@adnab.me>
* Add tracing integration with opentelemetryAlex Auvolat2022-03-141-1/+0
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* Make table name a const in traitAlex Auvolat2021-12-151-6/+9
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* Fix clippy lints (fix #121)Alex Auvolat2021-10-261-2/+2
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* fix clippy warnings on tableTrinity Pointard2021-05-031-13/+6
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* Improve bootstraping: do it regularly; persist peer listAlex Auvolat2021-04-271-6/+17
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* Todo make a test for the Merkle updaterAlex Auvolat2021-03-161-44/+59
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* Update dependenciesAlex Auvolat2021-03-161-6/+5
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* Simpler Merkle & syncAlex Auvolat2021-03-161-17/+12
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* some reorderingAlex Auvolat2021-03-161-4/+2
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* Refactor codeAlex Auvolat2021-03-161-27/+34
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* Some improvements in background worker but we terminate lateAlex Auvolat2021-03-151-4/+1
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* WIP migrate to tokio 1Alex Auvolat2021-03-151-2/+2
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* Refactor block resync loop; make workers infaillibleAlex Auvolat2021-03-151-2/+1
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* Small fixesAlex Auvolat2021-03-151-2/+10
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* Tiny thingsAlex Auvolat2021-03-151-0/+1
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* Make block rc code more understandableAlex Auvolat2021-03-151-1/+1
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* Implement table gc, currently for block_ref and version onlyAlex Auvolat2021-03-121-4/+1
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* Implement garage stats to get info on node contentsAlex Auvolat2021-03-121-2/+2
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* Make syncer have its own rpc client/serverAlex Auvolat2021-03-121-5/+13
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* Fix merkle updater not being notified; improved loggingAlex Auvolat2021-03-121-6/+7
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* whoopsAlex Auvolat2021-03-111-1/+2
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* (not well tested) use merkle tree for syncAlex Auvolat2021-03-111-24/+83
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* WIP big refactoringAlex Auvolat2021-03-111-11/+28
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* Checkpoint: add merkle tree in data tableAlex Auvolat2021-03-111-0/+352