vtgateproxy: sticky random balancer and remote zone backup connections v19 #598
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#593) * gist of the idea of a sticky_random balancer * make sticky_random actually work * include the zone locality in the address attributes Make it available to the picker layer along with the pool type. Also rework how the locality is computed to do it as part of building the target host rather than deferring the comparisons to the sorter. * include IsLocal in debug output * add support for local zone affinity to sticky_random Using the zone local attribute inhjected by discovery (if it exists), update sticky_random so that it biases to only use the local zone connections if there are any available, otherwise fall back to remote. * add num_backup_conns option to force discovery of non-zone-local vtgates
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rjlaine
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Feb 6, 2025
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#593 onto vtgateproxy v19
add test coverage