Least connected load balancing strategy #385
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Round-robin load balancing was previously coupled with the address set implementation and made it hard to use different load balancing algorithm. This commit turns RoundRobinAddressSet into a simple concurrent set of addresses and moves load balancing logic into a separate component that takes list of available addresses and returns one that should be used next. This allows easier implementation of new load balancing algorithms. Rediscovery procedure will now not use load balancing and query routers in a known order (which is randomized by the database).
This replaces the existing round-robin. It gives us better performance with clusters composed of different machine capacities. Lease connected load balancing strategy selects start index in round-robin fashion to avoid always selecting same machine when cluster does not have any running transactions or all machines have same number of active connections.
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ali-ince
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Jul 6, 2017
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Based on #384