Part X — Dynamics, variants, and frontier research

These are the topics in this section, each on its own page with a stable path you can bookmark or share.

What topics are covered in this section?

• How does HNSW handle updates, deletion, and graph repair?
• How does HNSW compare with alternative graph-based ANN designs?
• How is HNSW combined into hybrid index architectures?
• What HNSW variants are emerging from current research?
• What are the most common production failure modes, and how do you debug them?
• What open research problems remain in HNSW?

Part X covers HNSW as a living system: updates and repair, alternative graph designs, hybrid architectures, emerging variants, production failure modes, and open research problems.

What does this Part add after static algorithms?

Indexes churn, predicates break connectivity, new graph families compete, and research proposes adaptive and certified search. Part X prepares operators and researchers for that moving target. Failure-mode and frontier glossaries are companions to these chapters.

Six chapters run from deletion/repair, through comparisons and hybrids, to variants, debugging, and open problems.

How does Weaviate show up?

Tombstone cleanup, async replication, ACORN-style filters, quantization, and HFresh are practical answers to themes this Part discusses. Read chapters as capability maps, then confirm current Weaviate behavior in product docs when implementing.

Part X is also the bridge into the frontier glossary hub.

What next?

Start with updates and deletion if you run mutable corpora; otherwise skim alternatives and jump to failure modes. Finish on open problems if you research, or frontier terms if you track roadmaps.

Part X is HNSW over time and under stress. Next, open “How does HNSW handle updates, deletion, and graph repair?” or the failure-modes chapter if you are mid-incident.