xds: Implement proactive connection in RingHashLoadBalancer per gRFC A61 by becomeStar · Pull Request #12596 · grpc/grpc-java (original) (raw)

added 3 commits

January 5, 2026 00:03

@becomeStar

Implement proactive connection logic in RingHashLoadBalancer as outlined in gRFC A61. This address the missing logic where the balancer should initialize the first IDLE child when a child balancer reports TRANSIENT_FAILURE and no other children are connecting.

This behavior, which was previously present before grpc#10610, ensures that a backup subchannel starts connecting immediately outside of the picker flow, reducing failover latency.

Fixes grpc#12024

@becomeStar

Update existing unit tests and add new test cases to validate the proactive connection behavior. Verification counts in several tests have been adjusted to reflect that the balancer now initiates connections immediately upon subchannel failure.

@becomeStar

ejona86

@becomeStar

@becomeStar

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Jan 6, 2026

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