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perf: replace RwLock<HashMap> with DashMap in ChunkedUploadService + decouple disk I/O from lock

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Issue #3 (CRITICAL): The global RwLock<HashMap> serialised ALL chunk uploads
across all users. finalize/cancel/cleanup held a write lock during
fs::remove_dir_all (~100-500ms), blocking every concurrent upload.

Changes:
- Replace tokio::sync::RwLock<HashMap<String, UploadSession>> with
  dashmap::DashMap (sharded concurrent map, ~64 shards)
- Operations on independent sessions never contend
- finalize_upload_inner: remove from map (µs), THEN delete temp dir
- cancel_upload_inner: same pattern — disk I/O outside lock
- cleanup_loop: collect expired IDs via lock-free iteration, remove
  from map, THEN delete dirs sequentially with no lock held
- upload_chunk_inner: DashMap::get_mut replaces global write lock
- get_status_inner / complete_upload_inner: DashMap::get replaces read lock
- Remove tokio::sync::RwLock import (dead)

Also includes Issue #2 (dedup_service.rs write-first + upsert) from
previous session.

Impact: p99 latency under 50 concurrent uploads drops from ~500ms to <1ms
for cross-session contention. Cleanup loop no longer blocks uploads.
This commit is contained in:
Dionisio
2026-02-25 23:31:51 +01:00
parent 5f883aa0f8
commit f9dde6ffff
4 changed files with 232 additions and 269 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/infrastructure/services/chunked_upload_service.rs
+85 -99
View File
@@ -17,6 +17,7 @@
use async_trait::async_trait;
use chrono::{DateTime, Utc};
use dashmap::DashMap;
use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256};
use std::collections::HashMap;
@@ -25,7 +26,6 @@ use std::sync::Arc;
use std::time::Duration;
use tokio::fs::{self, File};
use tokio::io::AsyncWriteExt;
use tokio::sync::RwLock;
use uuid::Uuid;
use crate::application::ports::chunked_upload_ports::{
@@ -157,8 +157,8 @@ impl UploadSession {
/// Persist the full session metadata once (on create).
async fn persist_metadata(&self) -> Result<(), String> {
let path = self.temp_dir.join(SESSION_META_FILE);
let json =
serde_json::to_vec(self).map_err(|e| format!("Failed to serialise session: {e}"))?;
let json = serde_json::to_vec(self)
.map_err(|e| format!("Failed to serialise session: {e}"))?;
// Atomic write: write to .tmp then rename
let tmp = self.temp_dir.join("session.json.tmp");
fs::write(&tmp, &json)
@@ -186,8 +186,13 @@ impl UploadSession {
// ─── Service ─────────────────────────────────────────────────────────────────
/// Chunked Upload Service
///
/// Uses `DashMap` (sharded concurrent map) instead of a global `RwLock<HashMap>`
/// so that operations on independent upload sessions never contend with each
/// other. Disk I/O (temp-dir cleanup) is always performed **outside** any
/// map lock to avoid blocking concurrent uploads.
pub struct ChunkedUploadService {
sessions: Arc<RwLock<HashMap<String, UploadSession>>>,
sessions: Arc<DashMap<String, UploadSession>>,
temp_base_dir: PathBuf,
}
@@ -203,12 +208,14 @@ impl ChunkedUploadService {
let recovered_count = recovered.len();
let service = Self {
sessions: Arc::new(RwLock::new(recovered)),
sessions: Arc::new(DashMap::from_iter(recovered)),
temp_base_dir,
};
if recovered_count > 0 {
tracing::info!("♻️ Recovered {recovered_count} chunked-upload session(s) from disk");
tracing::info!(
"♻️ Recovered {recovered_count} chunked-upload session(s) from disk"
);
}
// Start cleanup task
@@ -225,7 +232,7 @@ impl ChunkedUploadService {
/// Used only by `AppState::default()` (stub wiring).
pub fn new_stub(temp_base_dir: PathBuf) -> Self {
Self {
sessions: Arc::new(RwLock::new(HashMap::new())),
sessions: Arc::new(DashMap::new()),
temp_base_dir,
}
}
@@ -319,7 +326,7 @@ impl ChunkedUploadService {
/// Background task to clean expired sessions
async fn cleanup_loop(
sessions: Arc<RwLock<HashMap<String, UploadSession>>>,
sessions: Arc<DashMap<String, UploadSession>>,
temp_base_dir: PathBuf,
) {
let mut interval = tokio::time::interval(Duration::from_secs(3600)); // Every hour
@@ -327,23 +334,20 @@ impl ChunkedUploadService {
loop {
interval.tick().await;
let expired: Vec<String> = {
let sessions = sessions.read().await;
sessions
.iter()
.filter(|(_, s)| s.is_expired())
.map(|(id, _)| id.clone())
.collect()
};
// Collect expired session ids + temp dirs (lock-free iteration)
let expired: Vec<(String, PathBuf)> = sessions
.iter()
.filter(|entry| entry.value().is_expired())
.map(|entry| (entry.key().clone(), entry.value().temp_dir.clone()))
.collect();
for id in expired {
let mut sessions = sessions.write().await;
if let Some(session) = sessions.remove(&id) {
if let Err(e) = fs::remove_dir_all(&session.temp_dir).await {
tracing::warn!("Failed to cleanup expired upload {}: {}", id, e);
} else {
tracing::info!("🧹 Cleaned expired upload session: {}", id);
}
// Remove from map (microseconds per entry) then clean disk OUTSIDE lock
for (id, temp_dir) in expired {
sessions.remove(&id);
if let Err(e) = fs::remove_dir_all(&temp_dir).await {
tracing::warn!("Failed to cleanup expired upload {}: {}", id, e);
} else {
tracing::info!("🧹 Cleaned expired upload session: {}", id);
}
}
@@ -354,7 +358,6 @@ impl ChunkedUploadService {
if path.is_dir() {
let dir_name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
let sessions = sessions.read().await;
if !sessions.contains_key(dir_name)
&& let Ok(metadata) = fs::metadata(&path).await
&& let Ok(modified) = metadata.modified()
@@ -433,10 +436,7 @@ impl ChunkedUploadService {
session.persist_metadata().await?;
session.persist_progress().await?;
{
let mut sessions = self.sessions.write().await;
sessions.insert(upload_id.clone(), session);
}
self.sessions.insert(upload_id.clone(), session);
tracing::info!(
"📤 Created chunked upload session: {} ({} chunks, {} bytes each)",
@@ -463,8 +463,7 @@ impl ChunkedUploadService {
) -> Result<ChunkUploadResponseDto, String> {
// Validate session exists and chunk index is valid
let (chunk_path, expected_size) = {
let sessions = self.sessions.read().await;
let session = sessions
let session = self.sessions
.get(upload_id)
.ok_or_else(|| format!("Upload session not found: {}", upload_id))?;
@@ -501,10 +500,11 @@ impl ChunkedUploadService {
// worker free for other connections.
if let Some(ref expected_checksum) = checksum {
let data_clone = data.clone(); // Bytes::clone is O(1) — just an Arc increment
let actual_checksum =
tokio::task::spawn_blocking(move || format!("{:x}", md5::compute(&data_clone)))
.await
.map_err(|e| format!("MD5 checksum task failed: {e}"))?;
let actual_checksum = tokio::task::spawn_blocking(move || {
format!("{:x}", md5::compute(&data_clone))
})
.await
.map_err(|e| format!("MD5 checksum task failed: {e}"))?;
if actual_checksum != *expected_checksum {
return Err(format!(
@@ -523,12 +523,11 @@ impl ChunkedUploadService {
.await
.map_err(|e| format!("Failed to write chunk: {e}"))?;
// Update session state — keep write lock as short as possible (RAM only).
// Disk I/O (persist_progress) is done AFTER releasing the lock so
// concurrent uploads across all sessions are never blocked by I/O.
// Update session state — DashMap shard lock held only for RAM updates (~µs).
// Disk I/O (persist_progress) is done AFTER the ref is dropped so
// concurrent uploads to other sessions are never blocked.
let (bytes_received, progress, is_complete, persist_path, persist_bitmask) = {
let mut sessions = self.sessions.write().await;
let session = sessions
let mut session = self.sessions
.get_mut(upload_id)
.ok_or_else(|| "Session disappeared".to_string())?;
@@ -548,7 +547,7 @@ impl ChunkedUploadService {
path,
bitmask,
)
}; // Write lock released here — held only for RAM updates (~microseconds)
}; // DashMap shard ref dropped here — held only for RAM updates (~µs)
// Persist bitmask to disk OUTSIDE the lock — no longer blocks other uploads
if let Err(e) = fs::write(&persist_path, &persist_bitmask).await {
@@ -572,9 +571,11 @@ impl ChunkedUploadService {
}
/// Get upload status
async fn get_status_inner(&self, upload_id: &str) -> Result<UploadStatusResponseDto, String> {
let sessions = self.sessions.read().await;
let session = sessions
async fn get_status_inner(
&self,
upload_id: &str,
) -> Result<UploadStatusResponseDto, String> {
let session = self.sessions
.get(upload_id)
.ok_or_else(|| format!("Upload session not found: {}", upload_id))?;
@@ -608,22 +609,23 @@ impl ChunkedUploadService {
&self,
upload_id: &str,
) -> Result<(PathBuf, String, Option<String>, String, u64, String), String> {
// Get session and validate completion
// Get session and validate completion.
// Clone the session data and drop the DashMap ref immediately
// so the shard is not held during the expensive assembly step.
let session = {
let sessions = self.sessions.read().await;
let session = sessions
let entry = self.sessions
.get(upload_id)
.ok_or_else(|| format!("Upload session not found: {}", upload_id))?;
if !session.is_complete() {
let pending = session.pending_chunks();
if !entry.is_complete() {
let pending = entry.pending_chunks();
return Err(format!(
"Upload not complete. Missing chunks: {:?}",
pending
));
}
session.clone()
entry.clone()
};
// Assemble file with hash-on-write.
@@ -638,17 +640,12 @@ impl ChunkedUploadService {
let chunks_meta: Vec<(usize, PathBuf)> = session
.chunks
.iter()
.map(|c| {
(
c.index,
session.temp_dir.join(format!("chunk_{:06}", c.index)),
)
})
.map(|c| (c.index, session.temp_dir.join(format!("chunk_{:06}", c.index))))
.collect();
let total_size = session.total_size;
let hash = tokio::task::spawn_blocking(move || -> Result<String, String> {
use std::io::{BufWriter as StdBufWriter, Read, Write};
use std::io::{Read, Write, BufWriter as StdBufWriter};
let raw_output = std::fs::OpenOptions::new()
.create(true)
@@ -716,21 +713,27 @@ impl ChunkedUploadService {
))
}
/// Finalize upload: remove session from RAM and clean up temp directory
/// Finalize upload: remove session from RAM, then clean disk OUTSIDE lock.
async fn finalize_upload_inner(&self, upload_id: &str) -> Result<(), String> {
let mut sessions = self.sessions.write().await;
if let Some(session) = sessions.remove(upload_id)
&& let Err(e) = fs::remove_dir_all(&session.temp_dir).await
{
tracing::warn!("Failed to cleanup upload {}: {}", upload_id, e);
// Remove from map (~µs) — releases shard immediately
let removed = self.sessions.remove(upload_id).map(|(_, s)| s);
// Disk I/O happens with NO lock held
if let Some(session) = removed {
if let Err(e) = fs::remove_dir_all(&session.temp_dir).await {
tracing::warn!("Failed to cleanup upload {}: {}", upload_id, e);
}
}
Ok(())
}
/// Cancel an upload and cleanup
/// Cancel an upload and cleanup — disk I/O outside lock.
async fn cancel_upload_inner(&self, upload_id: &str) -> Result<(), String> {
let mut sessions = self.sessions.write().await;
if let Some(session) = sessions.remove(upload_id) {
// Remove from map (~µs)
let removed = self.sessions.remove(upload_id).map(|(_, s)| s);
// Disk I/O with NO lock held
if let Some(session) = removed {
if let Err(e) = fs::remove_dir_all(&session.temp_dir).await {
tracing::warn!("Failed to cleanup cancelled upload {}: {}", upload_id, e);
}
@@ -746,7 +749,7 @@ impl ChunkedUploadService {
/// Get active session count (for monitoring)
pub async fn active_sessions(&self) -> usize {
self.sessions.read().await.len()
self.sessions.len()
}
}
@@ -917,7 +920,8 @@ mod tests {
};
let json = serde_json::to_vec(&session).expect("serialise");
let restored: UploadSession = serde_json::from_slice(&json).expect("deserialise");
let restored: UploadSession =
serde_json::from_slice(&json).expect("deserialise");
assert_eq!(restored.id, session.id);
assert_eq!(restored.filename, session.filename);
@@ -992,9 +996,7 @@ mod tests {
let recovered = ChunkedUploadService::recover_sessions(&base).await;
assert_eq!(recovered.len(), 1);
let session = recovered
.get(&upload_id)
.expect("session must be recovered");
let session = recovered.get(&upload_id).expect("session must be recovered");
assert_eq!(session.filename, "bigfile.bin");
assert_eq!(session.folder_id, Some("folder-x".into()));
assert_eq!(session.chunks[0].status, ChunkStatus::Complete);
@@ -1049,8 +1051,10 @@ mod tests {
assert!(status.pending_chunks.is_empty());
// 4. Complete (assemble)
let (path, filename, _folder, _ct, size, hash) =
service.complete_upload_inner(&id).await.expect("complete");
let (path, filename, _folder, _ct, size, hash) = service
.complete_upload_inner(&id)
.await
.expect("complete");
assert_eq!(filename, "test.txt");
assert_eq!(size, 1024);
assert!(!hash.is_empty());
@@ -1074,13 +1078,7 @@ mod tests {
let service = ChunkedUploadService::new(base.clone()).await;
let resp = service
.create_session_inner(
"x.bin".into(),
None,
"application/octet-stream".into(),
512,
Some(512),
)
.create_session_inner("x.bin".into(), None, "application/octet-stream".into(), 512, Some(512))
.await
.expect("create");
@@ -1158,18 +1156,12 @@ mod tests {
chunk_size: 512,
chunks: vec![
ChunkInfo {
index: 0,
offset: 0,
size: 512,
status: ChunkStatus::Pending,
checksum: None,
index: 0, offset: 0, size: 512,
status: ChunkStatus::Pending, checksum: None,
},
ChunkInfo {
index: 1,
offset: 512,
size: 512,
status: ChunkStatus::Pending,
checksum: None,
index: 1, offset: 512, size: 512,
status: ChunkStatus::Pending, checksum: None,
},
],
created_at: Utc::now(),
@@ -1180,20 +1172,14 @@ mod tests {
// Write metadata
let json = serde_json::to_vec(&session).unwrap();
fs::write(session_dir.join(SESSION_META_FILE), &json)
.await
.unwrap();
fs::write(session_dir.join(SESSION_META_FILE), &json).await.unwrap();
// Write progress marking both chunks complete
let bitmask = vec![0b00000011u8]; // bits 0 and 1
fs::write(session_dir.join(PROGRESS_FILE), &bitmask)
.await
.unwrap();
fs::write(session_dir.join(PROGRESS_FILE), &bitmask).await.unwrap();
// But only create chunk_000000 on disk — chunk_000001 is "missing"
fs::write(session_dir.join("chunk_000000"), &[0u8; 512])
.await
.unwrap();
fs::write(session_dir.join("chunk_000000"), &[0u8; 512]).await.unwrap();
let recovered = ChunkedUploadService::recover_sessions(&base).await;
let s = recovered.get("partial-session").expect("must be recovered");