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Balancing vs Stickiness
Balancing:
random
shuffle
roundRobin
leastConns
Sticky:
per USER
per HOST
Work on implementing just the balancing strategies, for now.
Note: The state files used for the balancing strategies, especially once
health checks are added, could be externally cached/managed, e.g. via
memcache/redis, using JSON.
Issues there: if each mod_proxy is doing its own health checks of the
servers, it's possible for individual mod_proxy instances to disagree
about the health of a given backend (think split-brain syndrome).
When each mod_proxy instance is managing its own view, this is OK;
when they all share that persisted view, it could be a problem.
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