dde1da1c0e
382: Refactor attribute criterion r=Kerollmops a=ManyTheFish ### Re-implement set based algorithm for attribute criterion #### Levels Instead of doing level iteration and digging in the interesting level, we only iterate over the lowest level. #### crossword iteration VS minimal position iteration Instead of crossing word position in order to iterate strictly over the position that gives the best rank in good order; we iterate word by word starting with the word that increases the rank the little as possible. This new method is a bit less precise but way simpler. ### Simplify word-level-position database We don't use levels anymore in the attribute criterion, and so we removed the level complexity of the database making a word-position-docids database. ### Benchmarks on search on big datasets #### songs main VS refactor-attribute-criterion ```diff group search_songsmain_31c18f09 search_songsrefactor-attribute-criterion_1bd15d84 ----- ------------------------- ------------------------------------------------- - smol-songs.csv: basic filter: <=/Notstandskomitee 1.00 84.8±0.58µs ? ?/sec 1.09 92.2±8.98µs ? ?/sec + smol-songs.csv: basic filter: TO/Notstandskomitee 1.18 98.0±6.30µs ? ?/sec 1.00 83.2±0.97µs ? ?/sec + smol-songs.csv: basic with quote/"david" "bowie" 114.68 76.0±0.20ms ? ?/sec 1.00 662.5±5.03µs ? ?/sec - smol-songs.csv: basic with quote/"john" 1.00 197.4±1.06µs ? ?/sec 1.05 208.1±1.53µs ? ?/sec + smol-songs.csv: basic with quote/"michael" "jackson" 2.75 2.0±0.01ms ? ?/sec 1.00 738.9±3.91µs ? ?/sec + smol-songs.csv: basic without quote/david bowie 297.42 1499.3±0.86ms ? ?/sec 1.00 5.0±0.02ms ? ?/sec + smol-songs.csv: basic without quote/michael jackson 2.55 8.9±0.02ms ? ?/sec 1.00 3.5±0.01ms ? ?/sec + smol-songs.csv: big filter/john 1.08 473.6±2.25µs ? ?/sec 1.00 438.1±2.59µs ? ?/sec - smol-songs.csv: prefix search/a 1.00 446.9±1.81µs ? ?/sec 1.79 800.5±4.45µs ? ?/sec - smol-songs.csv: prefix search/b 1.00 398.5±2.74µs ? ?/sec 1.81 723.1±5.46µs ? ?/sec - smol-songs.csv: prefix search/i 1.00 486.3±1.99µs ? ?/sec 1.69 823.6±9.42µs ? ?/sec - smol-songs.csv: prefix search/s 1.00 229.6±3.29µs ? ?/sec 2.59 594.4±2.22µs ? ?/sec - smol-songs.csv: prefix search/x 1.00 150.2±0.76µs ? ?/sec 1.11 166.0±0.87µs ? ?/sec ``` On songs, the new algorithm gives a big improvement on slow queries, and is slower on one char prefix search (fast queries <1ms). #### wiki main VS refactor-attribute-criterion ```diff group search_wikimain_31c18f09 search_wikirefactor-attribute-criterion_1bd15d84 ----- ------------------------ ------------------------------------------------ - smol-wiki-articles.csv: basic with quote/"rock" "and" "roll" 1.00 3.2±0.01ms ? ?/sec 1.15 3.7±0.01ms ? ?/sec - smol-wiki-articles.csv: basic without quote/film 1.00 351.5±2.47µs ? ?/sec 1.13 396.8±1.63µs ? ?/sec + smol-wiki-articles.csv: basic without quote/rock and roll 1.10 9.4±0.02ms ? ?/sec 1.00 8.6±0.04ms ? ?/sec - smol-wiki-articles.csv: basic without quote/spain 1.00 446.0±3.23µs ? ?/sec 1.11 496.6±7.75µs ? ?/sec - smol-wiki-articles.csv: prefix search/c 1.00 115.6±0.61µs ? ?/sec 2.22 256.7±1.24µs ? ?/sec - smol-wiki-articles.csv: prefix search/g 1.00 189.7±2.03µs ? ?/sec 1.57 297.0±1.35µs ? ?/sec - smol-wiki-articles.csv: prefix search/j 1.00 209.2±1.11µs ? ?/sec 1.40 293.0±2.09µs ? ?/sec - smol-wiki-articles.csv: prefix search/q 1.00 79.0±0.44µs ? ?/sec 1.10 87.2±0.69µs ? ?/sec - smol-wiki-articles.csv: prefix search/t 1.00 270.1±1.15µs ? ?/sec 1.55 419.9±5.16µs ? ?/sec - smol-wiki-articles.csv: prefix search/x 1.00 244.9±1.33µs ? ?/sec 1.07 260.9±1.95µs ? ?/sec - smol-wiki-articles.csv: words/Abraham machin 1.00 8.1±0.03ms ? ?/sec 1.17 9.4±0.02ms ? ?/sec - smol-wiki-articles.csv: words/Idaho Bellevue pizza 1.00 19.3±0.07ms ? ?/sec 1.07 20.6±0.05ms ? ?/sec ``` On wiki we have some regressions `+17%` and `+15%` on request `>1ms`. Co-authored-by: many <maxime@meilisearch.com>
a concurrent indexer combined with fast and relevant search algorithms
Introduction
This repository contains the core engine used in MeiliSearch.
It contains a library that can manage one and only one index. MeiliSearch manages the multi-index itself. Milli is unable to store updates in a store: it is the job of something else above and this is why it is only able to process one update at a time.
This repository contains crates to quickly debug the engine:
- There are benchmarks located in the
benchmarkscrate. - The
http-uicrate is a simple HTTP dashboard to tests the features like for real! - The
infoscrate is used to dump the internal data-structure and ensure correctness. - The
searchcrate is a simple command-line that helps run flamegraph on top of it. - The
helperscrate is only used to modify the database inplace, sometimes.
Compile and run the HTTP debug server
You can specify the number of threads to use to index documents and many other settings too.
cd http-ui
cargo run --release -- --db my-database.mdb -vvv --indexing-jobs 8
Index your documents
It can index a massive amount of documents in not much time, I already achieved to index:
- 115m songs (song and artist name) in ~48min and take 81GiB on disk.
- 12m cities (name, timezone and country ID) in ~4min and take 6GiB on disk.
These metrics are done on a MacBook Pro with the M1 processor.
You can feed the engine with your CSV (comma-seperated, yes) data like this:
printf "id,name,age\n1,hello,32\n2,kiki,24\n" | http POST 127.0.0.1:9700/documents content-type:text/csv
Don't forget to specify the id of the documents. Also, note that it supports JSON and JSON
streaming: you can send them to the engine by using the content-type:application/json and
content-type:application/x-ndjson headers respectively.
Querying the engine via the website
You can query the engine by going to the HTML page itself.
Contributing
You can setup a git-hook to stop you from making a commit too fast. It'll stop you if:
- Any of the workspaces does not build
- Your code is not well-formatted
These two things are also checked in the CI, so ignoring the hook won't help you merge your code.
But if you need to, you can still add --no-verify when creating your commit to ignore the hook.
To enable the hook, run the following command from the root of the project:
cp script/pre-commit .git/hooks/pre-commit