[GitHub] [lucene] jpountz commented on pull request #641: LUCENE-10391: Reuse data structures across HnswGraph#searchLevel calls

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jpountz commented on pull request #641:
URL: https://github.com/apache/lucene/pull/641#issuecomment-1029048199


   I've become a bit cautious with codec-level caching. E.g. we have threadlocals for stored fields which end up storing `num_search_threads * num_indices * num_segments_per_index` states overall, which is not always negligible depending on the size of the state. It's possible to try to share across fields or segments, but you need to pay attention to the case when they might use different file formats, which introduces complexity.


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