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| -rw-r--r-- | source/rainerscript/functions/mo-hashXXmod.rst | 48 |
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diff --git a/source/rainerscript/functions/mo-hashXXmod.rst b/source/rainerscript/functions/mo-hashXXmod.rst new file mode 100644 index 0000000..8fc1d77 --- /dev/null +++ b/source/rainerscript/functions/mo-hashXXmod.rst @@ -0,0 +1,48 @@ +********* +HashXXmod +********* + +Purpose +======= + +Generates a number which is mod of given string's hash. + +hash32mod(literal_string, modulo) / hash32mod(literal_string, modulo, seed) +--------------------------------------------------------------------------- + + Generates a number which is calculated on (32 bit hash of the given string % modulo) + - If modulo is not a valid number, then 0 is returned. + - If modulo is 0, then 0 is returned. + - Seed is an optional parameter with default = 0. + - If seed is not a valid unsigned number, then 0 is returned. + + +hash64mod(literal_string, modulo) / hash64mod(literal_string, modulo, seed) +--------------------------------------------------------------------------- + + Generates a number which is calculated on (64 bit hash of the given string % modulo) + - If modulo is not a valid number, then 0 is returned. + - If modulo is 0, then 0 is returned. + - Seed is an optional parameter with default = 0. + - If seed is not a valid unsigned number, then 0 is returned. + + +.. warning:: + + - Default hash implementation is non-crypto. + - To use xxhash enable compile time flag. + + +Example +======= + +.. code-block:: none + + module(load="fmhash") + + if (hash64mod($!msg!request_id, 100) <= 30) then { + //send out + } + +.. seealso:: + :doc:`Hash based sampling<../../tutorials/hash_sampling>` |