Episode 4 of 9 · Google Search
Scatter-gather: one query, a thousand leaves, and the slowest one wins
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Scatter-gather: one query, a thousand leaves, and the slowest one wins. The index is sharded by document, which means no single machine can answer anything. Every query has to visit all of them. And it has about two hundred milliseconds, total, includi
Based on the board Query Serving.
Try it in the lab: Thirty stalls on one order.
Covered in Google Search - the case study, Thirty stalls on one order (availability, the nines, and the tail at scale).
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