With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.
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Following all the nuanced rules in your custom routing.xml profiles.
sum of weights += candidate.weight
，更多细节参见safew官方下载
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