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improvement: use sqlite properly

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This commit is contained in:
Timo Kösters 2021-08-01 16:59:52 +02:00
parent 8174b16c38
commit 2c4f966d60
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GPG key ID: 24DA7517711A2BA4
2 changed files with 24 additions and 90 deletions
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66
src/database.rs
View file

@ -47,12 +47,8 @@ pub struct Config {
db_cache_capacity_mb: f64,
#[serde(default = "default_sqlite_read_pool_size")]
sqlite_read_pool_size: usize,
#[serde(default = "true_fn")]
sqlite_wal_clean_timer: bool,
#[serde(default = "default_sqlite_wal_clean_second_interval")]
sqlite_wal_clean_second_interval: u32,
#[serde(default = "default_sqlite_wal_clean_second_timeout")]
sqlite_wal_clean_second_timeout: u32,
#[serde(default = "default_sqlite_spillover_reap_fraction")]
sqlite_spillover_reap_fraction: f64,
#[serde(default = "default_sqlite_spillover_reap_interval_secs")]
@ -120,11 +116,7 @@ fn default_sqlite_read_pool_size() -> usize {
}
fn default_sqlite_wal_clean_second_interval() -> u32 {
60 * 60
}
fn default_sqlite_wal_clean_second_timeout() -> u32 {
2
15 * 60 // every 15 minutes
}
fn default_sqlite_spillover_reap_fraction() -> f64 {
@ -465,7 +457,7 @@ impl Database {
#[cfg(feature = "sqlite")]
{
Self::start_wal_clean_task(&db, &config).await;
Self::start_wal_clean_task(Arc::clone(&db), &config).await;
Self::start_spillover_reap_task(builder, &config).await;
}
@ -620,24 +612,17 @@ impl Database {
}
#[cfg(feature = "sqlite")]
#[tracing::instrument(skip(lock, config))]
pub async fn start_wal_clean_task(lock: &Arc<TokioRwLock<Self>>, config: &Config) {
use tokio::time::{interval, timeout};
#[tracing::instrument(skip(db, config))]
pub async fn start_wal_clean_task(db: Arc<TokioRwLock<Self>>, config: &Config) {
use tokio::time::interval;
#[cfg(unix)]
use tokio::signal::unix::{signal, SignalKind};
use tracing::info;
use std::{
sync::Weak,
time::{Duration, Instant},
};
use std::time::{Duration, Instant};
let weak: Weak<TokioRwLock<Database>> = Arc::downgrade(&lock);
let lock_timeout = Duration::from_secs(config.sqlite_wal_clean_second_timeout as u64);
let timer_interval = Duration::from_secs(config.sqlite_wal_clean_second_interval as u64);
let do_timer = config.sqlite_wal_clean_timer;
tokio::spawn(async move {
let mut i = interval(timer_interval);
@ -647,45 +632,24 @@ impl Database {
loop {
#[cfg(unix)]
tokio::select! {
_ = i.tick(), if do_timer => {
info!(target: "wal-trunc", "Timer ticked")
_ = i.tick() => {
info!("wal-trunc: Timer ticked");
}
_ = s.recv() => {
info!(target: "wal-trunc", "Received SIGHUP")
info!("wal-trunc: Received SIGHUP");
}
};
#[cfg(not(unix))]
if do_timer {
{
i.tick().await;
info!(target: "wal-trunc", "Timer ticked")
} else {
// timer disabled, and there's no concept of signals on windows, bailing...
return;
info!("wal-trunc: Timer ticked")
}
if let Some(arc) = Weak::upgrade(&weak) {
info!(target: "wal-trunc", "Rotating sync helpers...");
// This actually creates a very small race condition between firing this and trying to acquire the subsequent write lock.
// Though it is not a huge deal if the write lock doesn't "catch", as it'll harmlessly time out.
arc.read().await.globals.rotate.fire();
info!(target: "wal-trunc", "Locking...");
let guard = {
if let Ok(guard) = timeout(lock_timeout, arc.write()).await {
guard
} else {
info!(target: "wal-trunc", "Lock failed in timeout, canceled.");
continue;
}
};
info!(target: "wal-trunc", "Locked, flushing...");
let start = Instant::now();
if let Err(e) = guard.flush_wal() {
error!(target: "wal-trunc", "Errored: {}", e);
} else {
info!(target: "wal-trunc", "Flushed in {:?}", start.elapsed());
}
let start = Instant::now();
if let Err(e) = db.read().await.flush_wal() {
error!("wal-trunc: Errored: {}", e);
} else {
break;
info!("wal-trunc: Flushed in {:?}", start.elapsed());
}
}
});

48
src/database/abstraction/sqlite.rs
View file

@ -4,7 +4,7 @@ use crossbeam::channel::{
bounded, unbounded, Receiver as ChannelReceiver, Sender as ChannelSender, TryRecvError,
};
use parking_lot::{Mutex, MutexGuard, RwLock};
use rusqlite::{params, Connection, DatabaseName::Main, OptionalExtension, Params};
use rusqlite::{Connection, DatabaseName::Main, OptionalExtension, Params};
use std::{
collections::HashMap,
future::Future,
@ -122,16 +122,11 @@ impl Pool {
fn prepare_conn<P: AsRef<Path>>(path: P, cache_size: Option<u32>) -> Result<Connection> {
let conn = Connection::open(path)?;
conn.pragma_update(Some(Main), "journal_mode", &"WAL".to_owned())?;
// conn.pragma_update(Some(Main), "wal_autocheckpoint", &250)?;
// conn.pragma_update(Some(Main), "wal_checkpoint", &"FULL".to_owned())?;
conn.pragma_update(Some(Main), "synchronous", &"OFF".to_owned())?;
conn.pragma_update(Some(Main), "journal_mode", &"WAL")?;
conn.pragma_update(Some(Main), "synchronous", &"NORMAL")?;
if let Some(cache_kib) = cache_size {
conn.pragma_update(Some(Main), "cache_size", &(-Into::<i64>::into(cache_kib)))?;
conn.pragma_update(Some(Main), "cache_size", &(-i64::from(cache_kib)))?;
}
Ok(conn)
@ -193,9 +188,6 @@ impl DatabaseEngine for Engine {
config.db_cache_capacity_mb,
)?;
pool.write_lock()
.execute("CREATE TABLE IF NOT EXISTS _noop (\"key\" INT)", params![])?;
let arc = Arc::new(Engine {
pool,
iter_pool: Mutex::new(ThreadPool::new(10)),
@ -205,7 +197,7 @@ impl DatabaseEngine for Engine {
}
fn open_tree(self: &Arc<Self>, name: &str) -> Result<Arc<dyn Tree>> {
self.pool.write_lock().execute(format!("CREATE TABLE IF NOT EXISTS {} ( \"key\" BLOB PRIMARY KEY, \"value\" BLOB NOT NULL )", name).as_str(), [])?;
self.pool.write_lock().execute(&format!("CREATE TABLE IF NOT EXISTS {} ( \"key\" BLOB PRIMARY KEY, \"value\" BLOB NOT NULL )", name), [])?;
Ok(Arc::new(SqliteTable {
engine: Arc::clone(self),
@ -215,37 +207,15 @@ impl DatabaseEngine for Engine {
}
fn flush(self: &Arc<Self>) -> Result<()> {
self.pool
.write_lock()
.execute_batch(
"
PRAGMA synchronous=FULL;
BEGIN;
DELETE FROM _noop;
INSERT INTO _noop VALUES (1);
COMMIT;
PRAGMA synchronous=OFF;
",
)
.map_err(Into::into)
// we enabled PRAGMA synchronous=normal, so this should not be necessary
Ok(())
}
}
impl Engine {
pub fn flush_wal(self: &Arc<Self>) -> Result<()> {
self.pool
.write_lock()
.execute_batch(
"
PRAGMA synchronous=FULL; PRAGMA wal_checkpoint=TRUNCATE;
BEGIN;
DELETE FROM _noop;
INSERT INTO _noop VALUES (1);
COMMIT;
PRAGMA wal_checkpoint=PASSIVE; PRAGMA synchronous=OFF;
",
)
.map_err(Into::into)
self.pool.write_lock().pragma_update(Some(Main), "wal_checkpoint", &"RESTART")?;
Ok(())
}
// Reaps (at most) (.len() * `fraction`) (rounded down, min 1) connections.