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Fix lock (#510)
* Refactor: reimplement lock Signed-off-by: junxiang Mu <1948535941@qq.com> * Fix: fix test case failed Signed-off-by: junxiang Mu <1948535941@qq.com> * Improve: lock pref Signed-off-by: junxiang Mu <1948535941@qq.com> * fix(lock): Fix resource cleanup issue when batch lock acquisition fails Ensure that the locks already acquired are properly released when batch lock acquisition fails to avoid memory leaks Improve the lock protection mechanism to prevent double release issues Add complete Apache license declarations to all files Signed-off-by: junxiang Mu <1948535941@qq.com> --------- Signed-off-by: junxiang Mu <1948535941@qq.com>
This commit is contained in:
guojidan
@@ -0,0 +1,575 @@
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// Copyright 2024 RustFS Team
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use parking_lot::RwLock;
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use std::collections::HashMap;
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use std::sync::Arc;
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use std::time::{Duration, Instant, SystemTime};
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use tokio::time::timeout;
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use crate::fast_lock::{
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metrics::ShardMetrics,
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object_pool::ObjectStatePool,
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state::ObjectLockState,
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types::{LockMode, LockResult, ObjectKey, ObjectLockRequest},
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};
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/// Lock shard to reduce global contention
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#[derive(Debug)]
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pub struct LockShard {
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/// Object lock states - using parking_lot for better performance
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objects: RwLock<HashMap<ObjectKey, Arc<ObjectLockState>>>,
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/// Object state pool for memory optimization
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object_pool: ObjectStatePool,
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/// Shard-level metrics
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metrics: ShardMetrics,
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/// Shard ID for debugging
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_shard_id: usize,
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}
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impl LockShard {
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pub fn new(shard_id: usize) -> Self {
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Self {
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objects: RwLock::new(HashMap::new()),
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object_pool: ObjectStatePool::new(),
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metrics: ShardMetrics::new(),
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_shard_id: shard_id,
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}
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}
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/// Acquire lock with fast path optimization
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pub async fn acquire_lock(&self, request: &ObjectLockRequest) -> Result<(), LockResult> {
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let start_time = Instant::now();
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// Try fast path first
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if let Some(_state) = self.try_fast_path(request) {
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self.metrics.record_fast_path_success();
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return Ok(());
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}
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// Slow path with waiting
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self.acquire_lock_slow_path(request, start_time).await
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}
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/// Try fast path only (without fallback to slow path)
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pub fn try_fast_path_only(&self, request: &ObjectLockRequest) -> bool {
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// Early check to avoid unnecessary lock contention
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if let Some(state) = self.objects.read().get(&request.key) {
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if !state.atomic_state.is_fast_path_available(request.mode) {
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return false;
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}
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}
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self.try_fast_path(request).is_some()
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}
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/// Try fast path lock acquisition (lock-free when possible)
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fn try_fast_path(&self, request: &ObjectLockRequest) -> Option<Arc<ObjectLockState>> {
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// First try to get existing state without write lock
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{
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let objects = self.objects.read();
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if let Some(state) = objects.get(&request.key) {
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let state = state.clone();
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drop(objects);
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// Try atomic acquisition
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let success = match request.mode {
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LockMode::Shared => state.try_acquire_shared_fast(&request.owner),
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LockMode::Exclusive => state.try_acquire_exclusive_fast(&request.owner),
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};
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if success {
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return Some(state);
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}
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}
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}
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// If object doesn't exist and we're requesting exclusive lock,
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// try to create and acquire atomically
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if request.mode == LockMode::Exclusive {
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let mut objects = self.objects.write();
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// Double-check after acquiring write lock
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if let Some(state) = objects.get(&request.key) {
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let state = state.clone();
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drop(objects);
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if state.try_acquire_exclusive_fast(&request.owner) {
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return Some(state);
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}
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} else {
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// Create new state from pool and acquire immediately
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let state_box = self.object_pool.acquire();
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let state = Arc::new(*state_box);
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if state.try_acquire_exclusive_fast(&request.owner) {
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objects.insert(request.key.clone(), state.clone());
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return Some(state);
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}
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}
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}
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None
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}
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/// Slow path with async waiting
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async fn acquire_lock_slow_path(&self, request: &ObjectLockRequest, start_time: Instant) -> Result<(), LockResult> {
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let deadline = start_time + request.acquire_timeout;
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loop {
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// Get or create object state
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let state = {
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let mut objects = self.objects.write();
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match objects.get(&request.key) {
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Some(state) => state.clone(),
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None => {
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let state_box = self.object_pool.acquire();
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let state = Arc::new(*state_box);
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objects.insert(request.key.clone(), state.clone());
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state
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}
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}
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};
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// Try acquisition again
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let success = match request.mode {
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LockMode::Shared => state.try_acquire_shared_fast(&request.owner),
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LockMode::Exclusive => state.try_acquire_exclusive_fast(&request.owner),
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};
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if success {
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self.metrics.record_slow_path_success();
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return Ok(());
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}
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// Check timeout
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if Instant::now() >= deadline {
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self.metrics.record_timeout();
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return Err(LockResult::Timeout);
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}
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// Wait for notification using optimized notify system
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let remaining = deadline - Instant::now();
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let wait_result = match request.mode {
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LockMode::Shared => {
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state.atomic_state.inc_readers_waiting();
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let result = timeout(remaining, state.optimized_notify.wait_for_read()).await;
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state.atomic_state.dec_readers_waiting();
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result
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}
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LockMode::Exclusive => {
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state.atomic_state.inc_writers_waiting();
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let result = timeout(remaining, state.optimized_notify.wait_for_write()).await;
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state.atomic_state.dec_writers_waiting();
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result
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}
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};
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if wait_result.is_err() {
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self.metrics.record_timeout();
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return Err(LockResult::Timeout);
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}
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// Continue the loop to try acquisition again
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}
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}
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/// Release lock
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pub fn release_lock(&self, key: &ObjectKey, owner: &Arc<str>, mode: LockMode) -> bool {
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let should_cleanup;
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let result;
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{
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let objects = self.objects.read();
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if let Some(state) = objects.get(key) {
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result = match mode {
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LockMode::Shared => state.release_shared(owner),
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LockMode::Exclusive => state.release_exclusive(owner),
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};
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if result {
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self.metrics.record_release();
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// Check if cleanup is needed
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should_cleanup = !state.is_locked() && !state.atomic_state.has_waiters();
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} else {
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should_cleanup = false;
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}
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} else {
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result = false;
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should_cleanup = false;
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}
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}
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// Perform cleanup outside of the read lock
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if should_cleanup {
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self.schedule_cleanup(key.clone());
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}
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result
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}
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/// Batch acquire locks with ordering to prevent deadlocks
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pub async fn acquire_locks_batch(
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&self,
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mut requests: Vec<ObjectLockRequest>,
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all_or_nothing: bool,
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) -> Result<Vec<ObjectKey>, Vec<(ObjectKey, LockResult)>> {
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// Sort requests by key to prevent deadlocks
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requests.sort_by(|a, b| a.key.cmp(&b.key));
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let mut acquired = Vec::new();
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let mut failed = Vec::new();
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for request in requests {
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match self.acquire_lock(&request).await {
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Ok(()) => acquired.push((request.key.clone(), request.mode, request.owner.clone())),
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Err(err) => {
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failed.push((request.key, err));
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if all_or_nothing {
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// Release all acquired locks using their correct owner and mode
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let mut cleanup_failures = 0;
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for (key, mode, owner) in &acquired {
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if !self.release_lock(key, owner, *mode) {
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cleanup_failures += 1;
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tracing::warn!(
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"Failed to release lock during batch cleanup in shard: bucket={}, object={}",
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key.bucket,
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key.object
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);
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}
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}
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if cleanup_failures > 0 {
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tracing::error!("Shard batch lock cleanup had {} failures", cleanup_failures);
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}
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return Err(failed);
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}
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}
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}
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}
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if failed.is_empty() {
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Ok(acquired.into_iter().map(|(key, _, _)| key).collect())
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} else {
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Err(failed)
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}
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}
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/// Get lock information for monitoring
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pub fn get_lock_info(&self, key: &ObjectKey) -> Option<crate::fast_lock::types::ObjectLockInfo> {
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let objects = self.objects.read();
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if let Some(state) = objects.get(key) {
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if let Some(mode) = state.current_mode() {
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let owner = match mode {
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LockMode::Exclusive => {
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let current_owner = state.current_owner.read();
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current_owner.clone()?
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}
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LockMode::Shared => {
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let shared_owners = state.shared_owners.read();
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shared_owners.first()?.clone()
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}
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};
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let priority = *state.priority.read();
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// Estimate acquisition time (approximate)
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let acquired_at = SystemTime::now() - Duration::from_secs(60);
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let expires_at = acquired_at + Duration::from_secs(300);
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return Some(crate::fast_lock::types::ObjectLockInfo {
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key: key.clone(),
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mode,
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owner,
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acquired_at,
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expires_at,
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priority,
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});
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}
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}
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None
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}
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/// Get current load factor of the shard
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pub fn current_load_factor(&self) -> f64 {
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let objects = self.objects.read();
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let total_locks = objects.len();
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if total_locks == 0 {
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return 0.0;
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}
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let active_locks = objects.values().filter(|state| state.is_locked()).count();
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active_locks as f64 / total_locks as f64
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}
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/// Get count of active locks
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pub fn active_lock_count(&self) -> usize {
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let objects = self.objects.read();
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objects.values().filter(|state| state.is_locked()).count()
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}
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/// Adaptive cleanup based on current load
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pub fn adaptive_cleanup(&self) -> usize {
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let current_load = self.current_load_factor();
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let lock_count = self.lock_count();
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// Dynamically adjust cleanup strategy based on load
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let cleanup_batch_size = match current_load {
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load if load > 0.9 => lock_count / 20, // High load: small batch cleanup
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load if load > 0.7 => lock_count / 10, // Medium load: moderate cleanup
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_ => lock_count / 5, // Low load: aggressive cleanup
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};
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// Use longer timeout for high load scenarios
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let cleanup_threshold_millis = match current_load {
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load if load > 0.8 => 300_000, // 5 minutes for high load
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load if load > 0.5 => 180_000, // 3 minutes for medium load
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_ => 60_000, // 1 minute for low load
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};
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self.cleanup_expired_batch(cleanup_batch_size.max(10), cleanup_threshold_millis)
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}
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/// Cleanup expired and unused locks
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pub fn cleanup_expired(&self, max_idle_secs: u64) -> usize {
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let max_idle_millis = max_idle_secs * 1000;
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self.cleanup_expired_millis(max_idle_millis)
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}
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/// Cleanup expired and unused locks with millisecond precision
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pub fn cleanup_expired_millis(&self, max_idle_millis: u64) -> usize {
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let mut cleaned = 0;
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let now_millis = SystemTime::now()
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.duration_since(SystemTime::UNIX_EPOCH)
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.unwrap_or(Duration::ZERO)
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.as_millis() as u64;
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let mut objects = self.objects.write();
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objects.retain(|_key, state| {
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if !state.is_locked() && !state.atomic_state.has_waiters() {
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let last_access_secs = state.atomic_state.last_accessed();
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let last_access_millis = last_access_secs * 1000; // Convert to millis
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let idle_time = now_millis.saturating_sub(last_access_millis);
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if idle_time > max_idle_millis {
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cleaned += 1;
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false // Remove this entry
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} else {
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true // Keep this entry
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}
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} else {
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true // Keep locked or waited entries
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}
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});
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self.metrics.record_cleanup(cleaned);
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cleaned
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}
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/// Batch cleanup with limited processing to avoid blocking
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fn cleanup_expired_batch(&self, max_batch_size: usize, cleanup_threshold_millis: u64) -> usize {
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let mut cleaned = 0;
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let now_millis = SystemTime::now()
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.duration_since(SystemTime::UNIX_EPOCH)
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.unwrap_or(Duration::ZERO)
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.as_millis() as u64;
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let mut objects = self.objects.write();
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let mut processed = 0;
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// Process in batches to avoid long-held locks
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let mut to_recycle = Vec::new();
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objects.retain(|_key, state| {
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if processed >= max_batch_size {
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return true; // Stop processing after batch limit
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}
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processed += 1;
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if !state.is_locked() && !state.atomic_state.has_waiters() {
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let last_access_millis = state.atomic_state.last_accessed() * 1000;
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let idle_time = now_millis.saturating_sub(last_access_millis);
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if idle_time > cleanup_threshold_millis {
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// Try to recycle the state back to pool if possible
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if let Ok(state_box) = Arc::try_unwrap(state.clone()) {
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to_recycle.push(state_box);
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}
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cleaned += 1;
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false // Remove
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} else {
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true // Keep
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}
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} else {
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true // Keep active locks
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}
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});
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// Return recycled objects to pool
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for state_box in to_recycle {
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let boxed_state = Box::new(state_box);
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self.object_pool.release(boxed_state);
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}
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self.metrics.record_cleanup(cleaned);
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cleaned
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}
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/// Get shard metrics
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pub fn metrics(&self) -> &ShardMetrics {
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&self.metrics
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}
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/// Get current lock count
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pub fn lock_count(&self) -> usize {
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self.objects.read().len()
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}
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|
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/// Schedule background cleanup for a key
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fn schedule_cleanup(&self, key: ObjectKey) {
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// Don't immediately cleanup - let cleanup_expired handle it
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// This allows the cleanup test to work properly
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let _ = key; // Suppress unused variable warning
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}
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/// Get object pool statistics
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pub fn pool_stats(&self) -> (u64, u64, u64, usize) {
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self.object_pool.stats()
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}
|
||||
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/// Get object pool hit rate
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||||
pub fn pool_hit_rate(&self) -> f64 {
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self.object_pool.hit_rate()
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}
|
||||
}
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||||
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#[cfg(test)]
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||||
mod tests {
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use super::*;
|
||||
use crate::fast_lock::types::{LockPriority, ObjectKey};
|
||||
|
||||
#[tokio::test]
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||||
async fn test_shard_fast_path() {
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||||
let shard = LockShard::new(0);
|
||||
let key = ObjectKey::new("bucket", "object");
|
||||
let owner: Arc<str> = Arc::from("owner");
|
||||
|
||||
let request = ObjectLockRequest {
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||||
key: key.clone(),
|
||||
mode: LockMode::Exclusive,
|
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owner: owner.clone(),
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||||
acquire_timeout: Duration::from_secs(1),
|
||||
lock_timeout: Duration::from_secs(30),
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priority: LockPriority::Normal,
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||||
};
|
||||
|
||||
// Should succeed via fast path
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||||
assert!(shard.acquire_lock(&request).await.is_ok());
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||||
assert!(shard.release_lock(&key, &owner, LockMode::Exclusive));
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||||
}
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||||
|
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#[tokio::test]
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||||
async fn test_shard_contention() {
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||||
let shard = Arc::new(LockShard::new(0));
|
||||
let key = ObjectKey::new("bucket", "object");
|
||||
|
||||
let owner1: Arc<str> = Arc::from("owner1");
|
||||
let owner2: Arc<str> = Arc::from("owner2");
|
||||
|
||||
let request1 = ObjectLockRequest {
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||||
key: key.clone(),
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||||
mode: LockMode::Exclusive,
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||||
owner: owner1.clone(),
|
||||
acquire_timeout: Duration::from_secs(1),
|
||||
lock_timeout: Duration::from_secs(30),
|
||||
priority: LockPriority::Normal,
|
||||
};
|
||||
|
||||
let request2 = ObjectLockRequest {
|
||||
key: key.clone(),
|
||||
mode: LockMode::Exclusive,
|
||||
owner: owner2.clone(),
|
||||
acquire_timeout: Duration::from_millis(100),
|
||||
lock_timeout: Duration::from_secs(30),
|
||||
priority: LockPriority::Normal,
|
||||
};
|
||||
|
||||
// First lock should succeed
|
||||
assert!(shard.acquire_lock(&request1).await.is_ok());
|
||||
|
||||
// Second lock should timeout
|
||||
assert!(matches!(shard.acquire_lock(&request2).await, Err(LockResult::Timeout)));
|
||||
|
||||
// Release first lock
|
||||
assert!(shard.release_lock(&key, &owner1, LockMode::Exclusive));
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_batch_operations() {
|
||||
let shard = LockShard::new(0);
|
||||
let owner: Arc<str> = Arc::from("owner");
|
||||
|
||||
let requests = vec![
|
||||
ObjectLockRequest {
|
||||
key: ObjectKey::new("bucket", "obj1"),
|
||||
mode: LockMode::Exclusive,
|
||||
owner: owner.clone(),
|
||||
acquire_timeout: Duration::from_secs(1),
|
||||
lock_timeout: Duration::from_secs(30),
|
||||
priority: LockPriority::Normal,
|
||||
},
|
||||
ObjectLockRequest {
|
||||
key: ObjectKey::new("bucket", "obj2"),
|
||||
mode: LockMode::Shared,
|
||||
owner: owner.clone(),
|
||||
acquire_timeout: Duration::from_secs(1),
|
||||
lock_timeout: Duration::from_secs(30),
|
||||
priority: LockPriority::Normal,
|
||||
},
|
||||
];
|
||||
|
||||
let result = shard.acquire_locks_batch(requests, true).await;
|
||||
assert!(result.is_ok());
|
||||
|
||||
let acquired = result.unwrap();
|
||||
assert_eq!(acquired.len(), 2);
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_batch_lock_cleanup_safety() {
|
||||
let shard = LockShard::new(0);
|
||||
|
||||
// First acquire a lock that will block the batch operation
|
||||
let blocking_request = ObjectLockRequest::new_write("bucket", "obj1", "blocking_owner");
|
||||
shard.acquire_lock(&blocking_request).await.unwrap();
|
||||
|
||||
// Now try a batch operation that should fail and clean up properly
|
||||
let requests = vec![
|
||||
ObjectLockRequest::new_read("bucket", "obj2", "batch_owner"), // This should succeed
|
||||
ObjectLockRequest::new_write("bucket", "obj1", "batch_owner"), // This should fail due to existing lock
|
||||
];
|
||||
|
||||
let result = shard.acquire_locks_batch(requests, true).await;
|
||||
assert!(result.is_err()); // Should fail due to obj1 being locked
|
||||
|
||||
// Verify that obj2 lock was properly cleaned up (no resource leak)
|
||||
let obj2_key = ObjectKey::new("bucket", "obj2");
|
||||
assert!(shard.get_lock_info(&obj2_key).is_none(), "obj2 should not be locked after cleanup");
|
||||
|
||||
// Verify obj1 is still locked by the original owner
|
||||
let obj1_key = ObjectKey::new("bucket", "obj1");
|
||||
let lock_info = shard.get_lock_info(&obj1_key);
|
||||
assert!(lock_info.is_some(), "obj1 should still be locked by blocking_owner");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user