qdrant introduces risk vector_index

Source: Technology·Target: Failure Mode

Summary

Qdrant's HNSW index is built on the corpus at collection creation time; incremental inserts are added to the index graph, but recall degrades as the index diverges from the current distribution without periodic rebuilds.

Evidence

·qdrant notes the vector index is rebuilt only on full reindex and recall degrades as HNSW segments accumulate (technologies/qdrant.yaml degradation_patterns)
·vector_index_stale: HNSW greedy construction assumes a representative build-time distribution; incremental inserts degrade recall (failure_modes/vector_index_stale.yaml)

Evidence grounding

Grounded, 2 supporting items

HNSW recall degrades as incrementally-inserted segments accumulate without reindex/optimization.