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Always double reconnection delay and add jitter (#35337)

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Previously, we would pick an exponent between 0.5 and 2.5, which would
cause a lot of clients to try reconnecting in rapid succession,
overwhelming the server as a result.

This pull request always doubles the previous delay and introduces a
jitter that can, at most, double it.

As part of this, we're also increasing the maximum reconnection delay
from 10s to 30s: this gives us more space to spread out the reconnection
requests.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>
This commit is contained in:
Antonio Scandurra 2025-07-30 17:34:09 +02:00 • committed by GitHub
parent 0aea5acc68
commit 45af1fcc2f
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GPG key ID: B5690EEEBB952194
2 changed files with 8 additions and 9 deletions
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13
crates/client/src/client.rs
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@ -31,7 +31,6 @@ use rpc::proto::{AnyTypedEnvelope, EnvelopedMessage, PeerId, RequestMessage};
use schemars::JsonSchema;
use serde::{Deserialize, Serialize};
use settings::{Settings, SettingsSources};
use std::pin::Pin;
use std::{
any::TypeId,
convert::TryFrom,
@ -45,6 +44,7 @@ use std::{
},
time::{Duration, Instant},
};
use std::{cmp, pin::Pin};
use telemetry::Telemetry;
use thiserror::Error;
use tokio::net::TcpStream;
@ -78,7 +78,7 @@ pub static ZED_ALWAYS_ACTIVE: LazyLock<bool> =
LazyLock::new(|| std::env::var("ZED_ALWAYS_ACTIVE").map_or(false, |e| !e.is_empty()));
pub const INITIAL_RECONNECTION_DELAY: Duration = Duration::from_millis(500);
pub const MAX_RECONNECTION_DELAY: Duration = Duration::from_secs(10);
pub const MAX_RECONNECTION_DELAY: Duration = Duration::from_secs(30);
pub const CONNECTION_TIMEOUT: Duration = Duration::from_secs(20);
actions!(
@ -727,11 +727,10 @@ impl Client {
},
&cx,
);
cx.background_executor().timer(delay).await;
delay = delay
.mul_f32(rng.gen_range(0.5..=2.5))
.max(INITIAL_RECONNECTION_DELAY)
.min(MAX_RECONNECTION_DELAY);
let jitter =
Duration::from_millis(rng.gen_range(0..delay.as_millis() as u64));
cx.background_executor().timer(delay + jitter).await;
delay = cmp::min(delay * 2, MAX_RECONNECTION_DELAY);
} else {
break;
}