perf(endpoints): drop the per-endpoint load-balancing-weight wrapper - #4
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CreateLBEndpoint set LoadBalancingWeight to an explicit uint32 wrapper of value 1 for every endpoint. Envoy treats an unset per-endpoint weight as 1 (in all versions), so the wrapper was a heap allocation per endpoint with no behavioral effect; per-endpoint protos dominate control-plane heap at scale (~60-67% in profiles, with wrappers alone at ~8%). Locality-level LocalityLbEndpoints weights are computed exactly as before, treating an unset endpoint weight as 1 via a new lbWeight() helper. Plugins that set explicit endpoint weights (ServiceEntry, local cluster) are unaffected. Wire compatibility: omitting instead of explicitly sending weight 1 is behavior-identical for any Envoy version. Endpoint equality hashes change once, so envoys receive a single EDS re-push at upgrade (and again on rollback). Benchmarks (included): build path -9.5% B/op, -21% allocs/op at 100/1k/10k endpoints. Golden outputs regenerated: only per-endpoint loadBalancingWeight: 1 lines removed. Signed-off-by: Christian Scott <christian@modal.com>
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Reopened against upstream: kgateway-dev/kgateway |
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CreateLBEndpoint set LoadBalancingWeight to an explicit uint32 wrapper of
value 1 for every endpoint. Envoy treats an unset per-endpoint weight as
1 (in all versions), so the wrapper was a heap allocation per endpoint
with no behavioral effect; per-endpoint protos dominate control-plane
heap at scale (~60-67% in profiles, with wrappers alone at ~8%).
Locality-level LocalityLbEndpoints weights are computed exactly as
before, treating an unset endpoint weight as 1 via a new lbWeight()
helper. Plugins that set explicit endpoint weights (ServiceEntry, local
cluster) are unaffected.
Wire compatibility: omitting instead of explicitly sending weight 1 is
behavior-identical for any Envoy version. Endpoint equality hashes change
once, so envoys receive a single EDS re-push at upgrade (and again on
rollback).
Benchmarks (included): build path -9.5% B/op, -21% allocs/op at
100/1k/10k endpoints.
Golden outputs regenerated: only per-endpoint loadBalancingWeight: 1
lines removed.
Signed-off-by: Christian Scott christian@modal.com
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