[Core] More efficient rolling Bloom filter #2188
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For each 'bit' in the filter we really maintain 2 bits, which store either: 0: not set 1-3: set in generation N After (nElements / 2) insertions, we switch to a new generation, and wipe entries which already had the new generation number, effectively switching from the last 1.5 * nElements set to the last 1.0 * nElements set. This is 25% more space efficient than the previous implementation, and can (at peak) store 1.5 times the requested amount of history (though only 1.0 times the requested history is guaranteed). The existing unit tests should be sufficient.
This commit removes the `CBloomFilter::CBloomFilter(const unsigned int, const double, const unsigned int)` constructor, which became obsolete with 086ee67.
furszy
approved these changes
Feb 6, 2021
Fuzzbawls
approved these changes
Feb 14, 2021
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From bitcoin#7113
Also included bitcoin#13948