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Ran 15 Dec 2019 07:11AM UTC

Files 76

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Committed 15 Dec 2019 05:38AM UTC coverage: 93.726% (+0.3%) from 93.42%

Job # GROUP=tests

Build Type

push

travis-ci

Committed by

ben-manes

Commit Message

Improve countmin4 spread if hashCode is zero

When the hashCode is zero, then due to multiplicative spreads the array
indexes were also zero. Similarly the difference between positive and
negative numbers, which flip only the signum bit, had a higher chance
of collisions. Even with these caveats, the spreads were quite good and
the cache has other schemes to protect itself from HashDoS style of
attacks.

The improvement here is simply too easy to ignore for a nicer theoretical
advantage. By adding the seed, which differs per row, we avoid this eye
sore. The change in hit rates is noise (0.01-0.5 %, often better).

Coverage Stats

6125 of 6535 relevant lines covered (93.73%)

0.94 hits per line

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