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Merge #4479

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4479: Skip reindexing when modifying unknown faceted fields r=dureuill a=Kerollmops

This PR improves Meilisearch's decision to reindex when a faceted field is added to the settings, but not a single document contains this field. It is effectively a waste of time to reindex documents when the engine needs to know a field.

This is related to a conversation [we have with our biggest customer (internal link)](https://discord.com/channels/1006923006964154428/1101213808627830794/1217112918857089187). They have 170 million documents, so reindexing this amount would be problematic.

---

The image is available by using the following Docker command. You can see the advancement of the image's build [on the GitHub CI page](https://github.com/meilisearch/meilisearch/actions/runs/8251688778).

```
docker pull getmeili/meilisearch:prototype-no-reindex-unknown-fields-0
```

Here is the hand-made test that shows that when modifying unknown filterable attributes, here `lol`, it doesn't reindex. However, when modifying the known `genre` field, it does reindex. You can see all that by looking at the time spent processing the update.

```json
{
  "uid": 3,
  "indexUid": "movies",
  "status": "succeeded",
  "type": "settingsUpdate",
  "canceledBy": null,
  "details": {
    "filterableAttributes": [
      "genres"
    ]
  },
  "error": null,
  "duration": "PT9.237703S",
  "enqueuedAt": "2024-03-12T15:34:26.836083Z",
  "startedAt": "2024-03-12T15:34:26.836374Z",
  "finishedAt": "2024-03-12T15:34:36.074077Z"
},
{
  "uid": 2,
  "indexUid": "movies",
  "status": "succeeded",
  "type": "settingsUpdate",
  "canceledBy": null,
  "details": {
    "filterableAttributes": [
      "lol"
    ]
  },
  "error": null,
  "duration": "PT0.000751S",
  "enqueuedAt": "2024-03-12T15:33:53.563923Z",
  "startedAt": "2024-03-12T15:33:53.565259Z",
  "finishedAt": "2024-03-12T15:33:53.56601Z"
},
{
  "uid": 0,
  "indexUid": "movies",
  "status": "succeeded",
  "type": "documentAdditionOrUpdate",
  "canceledBy": null,
  "details": {
    "receivedDocuments": 31944,
    "indexedDocuments": 31944
  },
  "error": null,
  "duration": "PT3.120723S",
  "enqueuedAt": "2024-02-17T10:35:55.042864Z",
  "startedAt": "2024-02-17T10:35:55.043505Z",
  "finishedAt": "2024-02-17T10:35:58.164228Z"
}
```

Co-authored-by: Clément Renault <clement@meilisearch.com>
This commit is contained in:
meili-bors[bot] 2024-03-13 16:23:32 +00:00 committed by GitHub
commit d2f77e88bd
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1 changed files with 9 additions and 1 deletions
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10
milli/src/update/settings.rs
View File

@ -1032,6 +1032,13 @@ impl<'a, 't, 'i> Settings<'a, 't, 'i> {
{
self.index.set_updated_at(self.wtxn, &OffsetDateTime::now_utc())?;
let existing_fields: HashSet<_> = self
.index
.field_distribution(self.wtxn)?
.into_iter()
.filter_map(|(field, count)| (count != 0).then_some(field))
.collect();
let old_faceted_fields = self.index.user_defined_faceted_fields(self.wtxn)?;
let old_fields_ids_map = self.index.fields_ids_map(self.wtxn)?;
@ -1052,7 +1059,8 @@ impl<'a, 't, 'i> Settings<'a, 't, 'i> {
// index new fields as facets. It means that the distinct attribute,
// an Asc/Desc criterion or a filtered attribute as be added or removed.
let new_faceted_fields = self.index.user_defined_faceted_fields(self.wtxn)?;
let faceted_updated = old_faceted_fields != new_faceted_fields;
let faceted_updated =
(&existing_fields - &old_faceted_fields) != (&existing_fields - &new_faceted_fields);
let stop_words_updated = self.update_stop_words()?;
let non_separator_tokens_updated = self.update_non_separator_tokens()?;