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proxy: reintroduce dynamic limiter for compute lock (#7737)

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## Problem

Computes that are healthy can manage many connection attempts at a time.
Unhealthy computes cannot. We initially handled this with a fixed
concurrency limit, but it seems this inhibits pgbench.

## Summary of changes

Support AIMD for connect_to_compute lock to allow varying the
concurrency limit based on compute health
This commit is contained in:
Conrad Ludgate
2024-05-29 11:17:05 +01:00
committed by GitHub
parent 14df69d0e3
commit c8cebecabf
11 changed files with 563 additions and 40 deletions
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4
proxy/src/serverless/backend.rs
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@@ -232,9 +232,9 @@ impl ConnectMechanism for TokioMechanism {
.connect_timeout(timeout);
let pause = ctx.latency_timer.pause(crate::metrics::Waiting::Compute);
let (client, connection) = config.connect(tokio_postgres::NoTls).await?;
let res = config.connect(tokio_postgres::NoTls).await;
drop(pause);
drop(permit);
let (client, connection) = permit.release_result(res)?;
tracing::Span::current().record("pid", &tracing::field::display(client.get_process_id()));
Ok(poll_client(