A bit. When you collide in both tables, you switch to a different hash function ...

mikeash on March 21, 2019 | parent | context | favorite | on: Why Hashbrown Does a Double Lookup

A bit. When you collide in both tables, you switch to a different hash function and try again. With real-world data, that should work great. But with pathological data (i.e. the worst case behavior) that will never succeed.