freshness
FDE interview questions tagged freshness, across every topic.
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Concepts behind "freshness"
The curriculum that explains the ideas these questions test.
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Batch vs StreamingStreaming costs more to build, more to run and far more to debug, so the question is never which is more modern but what the decision latency actually is. Most customers who ask for real-time need fresh-enough, and the useful move is converting a vague freshness request into a number tied to a decision someone makes.🗄️ Data & SQL Engineering🔒 Premium
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Embedding Versions and DriftTwo versions of an embedding model produce unrelated coordinate systems, so a document's old and new vector are no more similar to each other than to a random document. Mixing them in one index cannot raise an error, which is why a half-finished migration returns confident nonsense at full speed.🤖 Retrieval & Agents🔒 Premium
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Index Freshness and Staleness WindowsStaleness is a query-share number, not a corpus-share number, and the two differ by an order of magnitude or more because the documents that changed during a rebuild are the ones people are asking about. A delta index bounds the worst case to its flush interval regardless of how long the rebuild takes.🤖 Retrieval & Agents🔒 Premium