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fix the test, all pass now

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nnhphong
2025-12-10 18:08:54 -05:00
parent 9cae3b767d
commit 7100614950
1 changed files with 18 additions and 34 deletions
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50
src/balancer/adaptive_weight.rs
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@@ -27,7 +27,7 @@ impl AdaptiveWeightBalancer {
.iter()
.map(|b| AdaptiveNode {
backend: b.clone(),
weight: 0f64,
weight: 1f64,
})
.collect();
@@ -85,7 +85,6 @@ impl Balancer for AdaptiveWeightBalancer {
};
let ratio = risk / node.weight;
if ratio <= threshold {
return Some(node.backend.clone());
}
@@ -172,14 +171,10 @@ mod tests {
let mut b = AdaptiveWeightBalancer::new(backends.clone(), [0.5, 0.2, 0.2, 0.1], 0.5);
// initially equal weights
// update one backend to be heavily loaded
{
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(90.0, 80.0, 10.0, 5.0);
}
{
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(10.0, 5.0, 1.0, 1.0);
}
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(90.0, 80.0, 10.0, 5.0);
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(10.0, 5.0, 1.0, 1.0);
// Choose backend: should pick the less loaded host server1
let chosen = b
@@ -203,26 +198,22 @@ mod tests {
fn ratio_triggers_immediate_selection() {
// Arrange two servers where server 1 has composite load 0 and server 2 has composite load 100.
// With alpha = 1.0 and two servers, threshold = 1.0 * (r_sum / w_sum) = 1.0 * (100 / 2) = 50.
// Server 1 ratio = 0 / 1 = 0 <= 50 so it should be chosen immediately.
// Server 0 ratio = 0 / 1 = 0 <= 50 so it should be chosen immediately.
let backends = BackendPool::new(vec![
backend_factory("server-0", "127.0.0.1", 3000),
backend_factory("server-1", "127.0.0.1", 3001),
]);
let mut b = AdaptiveWeightBalancer::new(backends.clone(), [0.25, 0.25, 0.25, 0.25], 1.0);
{
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(0.0, 0.0, 0.0, 0.0);
}
{
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(100.0, 100.0, 100.0, 100.0);
}
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(0.0, 0.0, 0.0, 0.0);
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(100.0, 100.0, 100.0, 100.0);
let chosen = b
.choose_backend(unused_ctx())
.expect("should choose a backend");
assert_eq!(chosen.id, "server-1");
assert_eq!(chosen.id, "server-0");
}
#[test]
@@ -237,19 +228,12 @@ mod tests {
]);
// set current_loads (field expected to be public)
{
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(10.0, 10.0, 10.0, 10.0);
}
{
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(5.0, 5.0, 5.0, 5.0);
}
{
let mut sm2_guard = backends.backends.get(2).unwrap().metrics.write().unwrap();
sm2_guard.update(20.0, 20.0, 20.0, 20.0);
}
let mut sm0_guard = backends.backends.get(0).unwrap().metrics.write().unwrap();
sm0_guard.update(10.0, 10.0, 10.0, 10.0);
let mut sm1_guard = backends.backends.get(1).unwrap().metrics.write().unwrap();
sm1_guard.update(5.0, 5.0, 5.0, 5.0);
let mut sm2_guard = backends.backends.get(2).unwrap().metrics.write().unwrap();
sm2_guard.update(20.0, 20.0, 20.0, 20.0);
// Use coeffs that only consider CPU so composite load is easy to reason about.
let mut bal = AdaptiveWeightBalancer::new(backends.clone(), [1.0, 0.0, 0.0, 0.0], 0.5);