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block/repair.rs: Added a random element of 10 days to SCRUB_INTERVAL #516

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lx merged 2 commits from jpds/garage:scrub-randomize-window into main 2023-03-06 14:11:25 +00:00
Conversation 3 Commits 2 Files changed 2 +40 -11
2 changed files with 40 additions and 11 deletions
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3
src/block/manager.rs
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@ -185,6 +185,9 @@ impl BlockManager {
vars.register_ro(&self.scrub_persister, "scrub-last-completed", |p| {
p.get_with(|x| msec_to_rfc3339(x.time_last_complete_scrub))
});
vars.register_ro(&self.scrub_persister, "scrub-next-run", |p| {
p.get_with(|x| msec_to_rfc3339(x.time_next_run_scrub))
});
vars.register_ro(&self.scrub_persister, "scrub-corruptions_detected", |p| {
p.get_with(|x| x.corruptions_detected)
});

48
src/block/repair.rs
View file

@ -4,6 +4,7 @@ use std::sync::Arc;
use std::time::Duration;
use async_trait::async_trait;
use rand::Rng;
use serde::{Deserialize, Serialize};
use tokio::fs;
use tokio::select;
@ -19,8 +20,8 @@ use garage_util::tranquilizer::Tranquilizer;
use crate::manager::*;
// Full scrub every 30 days
const SCRUB_INTERVAL: Duration = Duration::from_secs(3600 * 24 * 30);
// Full scrub every 25 days with a random element of 10 days mixed in below
const SCRUB_INTERVAL: Duration = Duration::from_secs(3600 * 24 * 25);
// Scrub tranquility is initially set to 4, but can be changed in the CLI
// and the updated version is persisted over Garage restarts
const INITIAL_SCRUB_TRANQUILITY: u32 = 4;
@ -175,13 +176,30 @@ pub struct ScrubWorker {
pub struct ScrubWorkerPersisted {
pub tranquility: u32,
pub(crate) time_last_complete_scrub: u64,
pub(crate) time_next_run_scrub: u64,
pub(crate) corruptions_detected: u64,
}
fn randomize_next_scrub_run_time() -> u64 {
jpds marked this conversation as resolved Outdated
lx commented 2023-03-06 13:25:00 +00:00
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the name of this function should contain the word scrub, maybe randomize_next_scrub_run_time

the name of this function should contain the word `scrub`, maybe `randomize_next_scrub_run_time`
// Take SCRUB_INTERVAL and mix in a random interval of 10 days to attempt to
// balance scrub load across different cluster nodes.
let next_run_timestamp = now_msec()
+ SCRUB_INTERVAL
.saturating_add(Duration::from_secs(
rand::thread_rng().gen_range(0..3600 * 24 * 10),
))
.as_millis() as u64;
next_run_timestamp
}
impl garage_util::migrate::InitialFormat for ScrubWorkerPersisted {}
impl Default for ScrubWorkerPersisted {
fn default() -> Self {
ScrubWorkerPersisted {
time_last_complete_scrub: 0,
time_next_run_scrub: randomize_next_scrub_run_time(),
tranquility: INITIAL_SCRUB_TRANQUILITY,
corruptions_detected: 0,
}
@ -279,12 +297,13 @@ impl Worker for ScrubWorker {
}
fn status(&self) -> WorkerStatus {
let (corruptions_detected, tranquility, time_last_complete_scrub) =
let (corruptions_detected, tranquility, time_last_complete_scrub, time_next_run_scrub) =
self.persister.get_with(|p| {
(
p.corruptions_detected,
p.tranquility,
p.time_last_complete_scrub,
p.time_next_run_scrub,
)
});
@ -302,10 +321,16 @@ impl Worker for ScrubWorker {
s.freeform = vec![format!("Scrub paused, resumes at {}", msec_to_rfc3339(*rt))];
}
ScrubWorkerState::Finished => {
s.freeform = vec![format!(
"Last scrub completed at {}",
msec_to_rfc3339(time_last_complete_scrub)
)];
s.freeform = vec![
format!(
"Last scrub completed at {}",
msec_to_rfc3339(time_last_complete_scrub),
),
format!(
"Next scrub scheduled for {}",
msec_to_rfc3339(time_next_run_scrub)
),
];
}
}
s
@ -334,8 +359,10 @@ impl Worker for ScrubWorker {
.tranquilizer
.tranquilize_worker(self.persister.get_with(|p| p.tranquility)))
} else {
self.persister
.set_with(|p| p.time_last_complete_scrub = now_msec())?;
self.persister.set_with(|p| {
p.time_last_complete_scrub = now_msec();
p.time_next_run_scrub = randomize_next_scrub_run_time();
})?;
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lx commented 2023-03-06 13:24:23 +00:00
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Probably better to concatenate those two calls in one:

self.persister.set_with(|p| 
  p.time_last_complete_scrub = now_msec();
  p.time_next_run_scrub = randomize_next_run_time();
})?

set_with does non-async (possibly blocking) IO to write the persistent data to disk, better do it only once if possible

Probably better to concatenate those two calls in one: ```rust self.persister.set_with(|p| p.time_last_complete_scrub = now_msec(); p.time_next_run_scrub = randomize_next_run_time(); })? ``` `set_with` does non-async (possibly blocking) IO to write the persistent data to disk, better do it only once if possible
self.work = ScrubWorkerState::Finished;
self.tranquilizer.clear();
Ok(WorkerState::Idle)
@ -350,8 +377,7 @@ impl Worker for ScrubWorker {
ScrubWorkerState::Running(_) => return WorkerState::Busy,
ScrubWorkerState::Paused(_, resume_time) => (*resume_time, ScrubWorkerCommand::Resume),
ScrubWorkerState::Finished => (
self.persister.get_with(|p| p.time_last_complete_scrub)
+ SCRUB_INTERVAL.as_millis() as u64,
self.persister.get_with(|p| p.time_next_run_scrub),
ScrubWorkerCommand::Start,
),
};