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Merge #4013

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4013: Fix the ranking rule by temporarily disabling an assert in the bucket sort algorithm r=Kerollmops a=Kerollmops

This PR temporarily disables an assertion, making the search crash. [I created a tracking issue](https://github.com/meilisearch/meilisearch/issues/4012) to find a better way to fix this.

It no longer reverts a20e4d447c, which seemed to generate unreachable graphs and make the bucket sort ranking algorithm panic because of entering an unreachable state. We discussed that below in the comments.

Temporary fixes #4002, fixes #4006, and fixes #3995.

---

It took me approximately 2 days to find the first bad commit just because I'm bad in `git bisect` x `bash`, i.e. [I misused `%1` with `$!` to kill the most recently backgrounded job](https://unix.stackexchange.com/a/340084/212574)...

<details>
  <summary>Here is the script I used to find the invalid commit</summary>

```bash
#!/usr/bin/env bash

set -x

# remove the data
rm -rf data.ms

# build meilisearch
cargo build --release
# ignore this commit if it doesn't compile
if [[ $? != 0 ]]; then
    exit 125
fi

# index the dump and start from it
./target/release/meilisearch \
--http-addr 'localhost:7705' \
--import-dump $HOME/Downloads/modified-20230822-083016113.dump &

# wait 10 sec while it indexes the docs
sleep 5

# check if the server crashes on requests
echo '{
    "q": "rtx 305",
    "attributesToHighlight": [
        "*"
    ],
    "highlightPreTag": "<ais-highlight-0000000000>",
    "highlightPostTag": "</ais-highlight-0000000000>",
    "limit": 21,
    "offset": 0
}' | xh 'localhost:7705/indexes/arvutitark_local_orderables/search'

last_exit_code=$?

# Now kill Meilisearch
kill $!

# Clean the potential Cargo.lock
git checkout .

exit $last_exit_code
```
</details>

Co-authored-by: Kerollmops <clement@meilisearch.com>
Co-authored-by: Clément Renault <clement@meilisearch.com>
This commit is contained in:
meili-bors[bot] 2023-08-23 15:30:56 +00:00 committed by GitHub
commit cdb4b3e024
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1 changed files with 6 additions and 5 deletions
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11
milli/src/search/new/bucket_sort.rs
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@ -91,11 +91,12 @@ pub fn bucket_sort<'ctx, Q: RankingRuleQueryTrait>(
/// Update the universes accordingly and inform the logger.
macro_rules! back {
() => {
assert!(
ranking_rule_universes[cur_ranking_rule_index].is_empty(),
"The ranking rule {} did not sort its bucket exhaustively",
ranking_rules[cur_ranking_rule_index].id()
);
// FIXME: temporarily disabled assert: see <https://github.com/meilisearch/meilisearch/pull/4013>
// assert!(
// ranking_rule_universes[cur_ranking_rule_index].is_empty(),
// "The ranking rule {} did not sort its bucket exhaustively",
// ranking_rules[cur_ranking_rule_index].id()
// );
logger.end_iteration_ranking_rule(
cur_ranking_rule_index,
ranking_rules[cur_ranking_rule_index].as_ref(),