分布式事务处理的资源回收方法
在分布式系统中,事务处理过程中产生的临时资源(如消息队列、数据库连接、缓存数据等)需要及时回收,避免资源泄露和系统性能下降。
基于超时机制的资源回收
import time
import threading
from datetime import datetime, timedelta
class ResourcePool:
def __init__(self):
self.resources = {}
self.lock = threading.Lock()
def acquire_resource(self, resource_id, timeout=300): # 5分钟超时
with self.lock:
self.resources[resource_id] = {
'acquired_at': datetime.now(),
'timeout': timeout,
'status': 'active'
}
def release_resource(self, resource_id):
with self.lock:
if resource_id in self.resources:
del self.resources[resource_id]
# 定期清理超时资源
def cleanup_expired_resources(resource_pool):
now = datetime.now()
expired_resources = []
for rid, info in resource_pool.resources.items():
if (now - info['acquired_at']) > timedelta(seconds=info['timeout']):
expired_resources.append(rid)
for rid in expired_resources:
print(f"清理超时资源: {rid}")
del resource_pool.resources[rid]
基于事务状态的资源回收
# 事务状态机设计
class TransactionState:
PENDING = 'pending'
COMMITTED = 'committed'
ROLLEDBACK = 'rolledback'
TIMEOUT = 'timeout'
# 资源回收器
class ResourceRecovery:
def __init__(self):
self.transaction_resources = {}
def handle_transaction_state_change(self, tx_id, new_state):
if new_state in [TransactionState.COMMITTED, TransactionState.ROLLEDBACK, TransactionState.TIMEOUT]:
# 回收相关资源
resources = self.transaction_resources.get(tx_id, [])
for resource in resources:
self.cleanup_resource(resource)
def cleanup_resource(self, resource):
try:
# 具体的资源清理逻辑
print(f"回收资源: {resource}")
# 数据库连接关闭、消息删除等操作
except Exception as e:
print(f"资源回收失败: {e}")
实际部署建议
- 设置合理的超时时间(通常5-30分钟)
- 定期执行清理任务(每分钟一次)
- 监控资源使用情况,及时调整参数
- 建立异常处理机制,防止清理过程中的错误导致资源泄露

讨论