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TwoRandomChoicesLb

gatel_core::proxy::lb

Struct TwoRandomChoicesLb 

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pub struct TwoRandomChoicesLb;
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Two Random Choices (Power of Two Choices) load balancer.

Picks two healthy backends at random and selects the one with fewer active connections. This achieves near-optimal load distribution with O(1) selection cost, avoiding the global scan of LeastConnLb.

  • 0 healthy backends → None
  • 1 healthy backend → use it directly
  • 2+ healthy backends → pick 2 at random, choose the one with fewer connections

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impl Default for TwoRandomChoicesLb

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl LoadBalancer for TwoRandomChoicesLb

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fn select(&self, pool: &UpstreamPool, _ctx: &LbContext) -> Option<usize>

Choose a backend index. Returns None when no backend is available.

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