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Do better than "Too many iterations. Are all your keys unique?" #31

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lemire opened this issue Jan 5, 2023 · 0 comments
Open

Do better than "Too many iterations. Are all your keys unique?" #31

lemire opened this issue Jan 5, 2023 · 0 comments

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@lemire
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lemire commented Jan 5, 2023

Instead of failing with "Too many iterations. Are all your keys unique?", I recommend filling in the fingerprint buffer with 1s.

Example in Go:

		if iterations > MaxIterations {
			// The probability of this happening is lower than the
			// the cosmic-ray probability (i.e., a cosmic ray corrupts your system),
			// but if it happens, we just fill the fingerprint with ones which
			// will flag all possible keys as 'possible', ensuring a correct result.
			for i := 0; i < len(filter.Fingerprints); i++ {
				filter.Fingerprints[i] = ^uint8(0)
			}
			return filter, nil
		}

Reference:
https:/FastFilter/xorfilter/blob/6e1eda073dd4927a1c807e2cc47e4a66b56ad7a6/fusefilter.go#L104-L113

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