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Option controls the size of a hashtable of buckets. The larger the hashtable, the lesser probability of a hash collision, but at the expense of additional memory costs. Each bucket is estimated roughly to 32B. Size should be selected as a reasonably large prime due to the better hash function distribution properties. Hash table is internally chained and works well up to a fill rate of 90%, general rule of thumb is to select a prime near 1.2 * maximum_qps.
Default value: 393241