b11f85a635
4205: Prevent search hang on the processing index r=Kerollmops a=dureuill Fixes #4206, an issue originally [reported on Discord](https://discord.com/channels/1006923006964154428/1148983671026618579/1148983671026618579) where having parallel search requests on more indexes than the index cache capacity would cause search requests on the currently updating index to hang until the index is done updating. ## Test setup - Create 20 empty indexes by sending settings to them - repeatedly send placeholder search requests to each of the indexes in a loop - Create another index and send a significant batch of documents to index. - Attempt to perform a search request on that last index. - Before this PR, the search request hangs while the index update task is processing - After this PR, the search request respond immediately even while the index update task is processing ## Changes - When getting the handle to an index for some potentially long running batches of tasks, save it in the index scheduler. - Drop the handle from the index-scheduler when the task is done so that we don't leak indexes. - When getting an index from outside the task queue processor, check if there is such an handle matching the requested index. If so, skip the cache entirely and clone the handle. Co-authored-by: Louis Dureuil <louis.dureuil@xinra.net> Co-authored-by: Louis Dureuil <louis@meilisearch.com>
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