Multi-Modal Frontiers & Vector Architecture
Real-Time Vector Streaming
Real-time vector streaming keeps embeddings and retrieval indices fresh as data changes, so search and RAG answers reflect the latest state instead of last night's batch. The challenge is balancing freshness, cost, and consistency across ingestion, indexing, and serving.
要点
- Stream changes as events and upsert embeddings incrementally rather than rebuilding indexes.
- Use change-data-capture to keep vector stores in sync with the source of truth.
- Batch small updates to cut per-vector overhead while protecting latency.
- Handle deletes and updates explicitly; stale vectors silently pollute results.
- Version embeddings so model or chunking changes do not corrupt live indices.
- Monitor ingestion lag, index freshness, and query recall as first-class SLOs.
- Provide fallback to a slightly stale index rather than failing queries outright.
- Test retrieval quality on recent data, not just historical benchmarks.
常见问题
Is real-time indexing always better than batch?
No. Real-time helps fast-changing data; batch is cheaper and simpler for slow-moving content.
How fresh is fresh enough?
Match index lag to how often the underlying answers change, not to a fixed number.
What causes stale vectors?
Missed deletes, failed upserts, and embedding model changes without reindexing.
How do I measure streaming quality?
Track ingestion lag, recall on recent queries, and the share of results that are outdated.
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