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3.x: Add RandomTwoChoice load balancing policy #198

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3.x: Add RandomTwoChoice load balancing policy #198

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Commits on Mar 9, 2023

  1. Add RandomTwoChoice load balancing policy 

    The RandomTwoChoice policy is a wrapper load balancing policy that
adds the "Power of 2 Choice" algorithm to its child policy. It will
compare the first two hosts returned from the child policy query plan,
and will first return the host with the target shard having fewer
inflight requests. The rest of the child query plan will be left intact.

It is intended to be used with TokenAwarePolicy and RoundRobinPolicy,
to send queries to the replica nodes by always avoiding the worst option
(the replica with the target shard having the most inflight requests will not be chosen).
    @Gor027
    Gor027 committed Mar 9, 2023
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