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102 commits

Author SHA1 Message Date
b44d3fc796 Abstract database behind generic interface and implement alternative drivers (#322)
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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>
2022-06-08 10:01:44 +02:00
5768bf3622 First implementation of K2V (#293)
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**Specification:**

View spec at [this URL](https://git.deuxfleurs.fr/Deuxfleurs/garage/src/branch/k2v/doc/drafts/k2v-spec.md)

- [x] Specify the structure of K2V triples
- [x] Specify the DVVS format used for causality detection
- [x] Specify the K2V index (just a counter of number of values per partition key)
- [x] Specify single-item endpoints: ReadItem, InsertItem, DeleteItem
- [x] Specify index endpoint: ReadIndex
- [x] Specify multi-item endpoints: InsertBatch, ReadBatch, DeleteBatch
- [x] Move to JSON objects instead of tuples
- [x] Specify endpoints for polling for updates on single values (PollItem)

**Implementation:**

- [x] Table for K2V items, causal contexts
- [x] Indexing mechanism and table for K2V index
- [x] Make API handlers a bit more generic
- [x] K2V API endpoint
- [x] K2V API router
- [x] ReadItem
- [x] InsertItem
- [x] DeleteItem
- [x] PollItem
- [x] ReadIndex
- [x] InsertBatch
- [x] ReadBatch
- [x] DeleteBatch

**Testing:**

- [x] Just a simple Python script that does some requests to check visually that things are going right (does not contain parsing of results or assertions on returned values)
- [x] Actual tests:
  - [x] Adapt testing framework
  - [x] Simple test with InsertItem + ReadItem
  - [x] Test with several Insert/Read/DeleteItem + ReadIndex
  - [x] Test all combinations of return formats for ReadItem
  - [x] Test with ReadBatch, InsertBatch, DeleteBatch
  - [x] Test with PollItem
  - [x] Test error codes
- [ ] Fix most broken stuff
  - [x] test PollItem broken randomly
  - [x] when invalid causality tokens are given, errors should be 4xx not 5xx

**Improvements:**

- [x] Descending range queries
  - [x] Specify
  - [x] Implement
  - [x] Add test
- [x] Batch updates to index counter
- [x] Put K2V behind `k2v` feature flag

Co-authored-by: Alex Auvolat <alex@adnab.me>
Reviewed-on: #293
Co-authored-by: Alex <alex@adnab.me>
Co-committed-by: Alex <alex@adnab.me>
2022-05-10 13:16:57 +02:00
0091002ef2
New replication modes and their documentation
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2022-03-28 16:26:04 +02:00
2377a92f6b
Add wrapper over sled tree to count items (used for big queues) 2022-03-14 10:54:25 +01:00
203e8d2c34
Bump version to 0.7 because of incompatible Netapp 2022-03-14 10:54:24 +01:00
f869ca625d
Add spans to table calls, change span names in RPC 2022-03-14 10:54:12 +01:00
2a5609b292
Add metrics to API endpoint 2022-03-14 10:53:36 +01:00
818daa5c78
Refactor how durations are measured 2022-03-14 10:53:35 +01:00
8c2fb0c066
Add tracing integration with opentelemetry 2022-03-14 10:52:13 +01:00
2cab84b1fe
Add many metrics in table/ and rpc/ 2022-03-14 10:51:50 +01:00
1e2cf26373
Implement basic metrics in table 2022-03-14 10:51:17 +01:00
af261e1789 Fix a bug when a migration is followed by a rebalance
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Nodes would stabilize on different encoding formats for the values,
some having the pre-migration format and some having the post-migration
format. This would be reflected in the Merkle trees never converging
and thus having an infinite resync loop.
2022-02-10 17:38:27 +01:00
ba7f268b99
Rename and change query filters 2022-01-04 12:52:46 +01:00
beeef4758e
Some movement of helper code and refactoring of error handling 2022-01-04 12:52:46 +01:00
d8ab5bdc3e
New buckets for 0.6.0: fix model and migration 2022-01-04 12:47:28 +01:00
5b1117e582
New model for buckets 2022-01-04 12:45:46 +01:00
8f6026de5e
Make table name a const in trait 2021-12-15 15:39:10 +01:00
c94406f428
Improve how node roles are assigned in Garage
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- change the terminology: the network configuration becomes the role
  table, the configuration of a nodes becomes a node's role
- the modification of the role table takes place in two steps: first,
  changes are staged in a CRDT data structure. Then, once the user is
  happy with the changes, they can commit them all at once (or revert
  them).
- update documentation
- fix tests
- implement smarter partition assignation algorithm

This patch breaks the format of the network configuration: when
migrating, the cluster will be in a state where no roles are assigned.
All roles must be re-assigned and commited at once. This migration
should not pose an issue.
2021-11-16 16:05:53 +01:00
ad7ab31411
Implement GC delay for table data
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2021-11-08 15:47:47 +01:00
cc255d46cd
Refactor and comment table GC logic 2021-11-08 15:47:44 +01:00
ada7899b24
Fix clippy lints (fix #121)
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2021-10-26 10:20:05 +02:00
de4276202a
Improve CLI, adapt tests, update documentation 2021-10-25 14:21:48 +02:00
1b450c4b49
Improvements to CLI and various fixes for netapp version
Discovery via consul, persist peer list to file
2021-10-22 16:55:24 +02:00
4067797d01
First port of Garage to Netapp 2021-10-22 15:55:18 +02:00
b9127dd6f8
Prepare for v0.3.0 and add migration path from v0.2.1.x
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2021-05-28 15:29:58 +02:00
b490ebc7f6
Many improvements on ring/replication and its configuration:
- Explicit "replication_mode" configuration parameters that takes
  either "none", "2" or "3" as values, instead of letting user configure
  replication factor themselves. These are presets whose corresponding
  replication/quorum values can be found in replication/mode.rs

- Explicit support for single-node and two-node deployments
  (number of nodes must be at least "replication_mode", with "none"
  we can have only one node)

- Ring is now stored much more compactly with 256*8 + n*32 bytes,
  instead of 256*32 bytes

- Support for gateway-only nodes that do not store data
  (these nodes still need a metadata_directory to store the list
  of bucket and keys since those are stored on all nodes; it also
  technically needs a data_directory to start but it will stay
  empty unless we have bugs)
2021-05-28 14:07:36 +02:00
e4b9e4e24d
rename types to CamelCase
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2021-05-03 22:15:09 +02:00
f5a0cf0414
fix clippy warnings on table 2021-05-03 22:11:41 +02:00
2812a027ea
change some more comments and revert changes on TableSchema
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2021-04-27 16:49:07 +02:00
74373aebcf
make most requested changes 2021-04-27 16:47:08 +02:00
b437610812
attempt at documenting table crate 2021-04-27 16:37:10 +02:00
9ced9f78dc
Improve bootstraping: do it regularly; persist peer list 2021-04-27 16:37:08 +02:00
f859d15062 update to v0.2.1
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2021-03-19 13:39:18 +01:00
4c26a0b9c1 Update Cargo.toml files with AGPL license info
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2021-03-18 21:59:17 +01:00
dead945c8f Prepare for release 0.2
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2021-03-18 19:33:15 +01:00
390ab02f41 Todo make a test for the Merkle updater
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2021-03-16 20:13:07 +01:00
7b10245dfb Leader-based GC
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2021-03-16 18:42:33 +01:00
3fadc5cbbd Small changes 2021-03-16 16:35:10 +01:00
f4346cc5f4 Update dependencies
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2021-03-16 15:58:40 +01:00
2a41b82384 Simpler Merkle & sync
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2021-03-16 12:18:03 +01:00
0aad2f2e06 some reordering
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2021-03-16 11:47:39 +01:00
515029d026 Refactor code
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2021-03-16 11:43:58 +01:00
1d9961e411 Simplify replication logic
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2021-03-16 11:14:27 +01:00
6a8439fd13 Some improvements in background worker but we terminate late
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2021-03-15 23:14:12 +01:00
0cd5b2ae19 WIP migrate to tokio 1
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2021-03-15 22:36:41 +01:00
4d4117f2b4 Refactor block resync loop; make workers infaillible
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2021-03-15 20:09:44 +01:00
667e4e72a8 Small fixes 2021-03-15 19:51:16 +01:00
537f652fec Tiny things
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2021-03-15 18:40:27 +01:00
0290afe1f8 Make block rc code more understandable 2021-03-15 18:27:26 +01:00
3bf2df622a Time and metadata improvements
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2021-03-15 16:21:41 +01:00