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fix: sqlorContext SELECT-only 事务退出时 rollback，释放 MDL 锁防 poller 停摆

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SELECT-only 的 context 退出时既不 commit 也不 rollback，连接回池后事务未提交，
持有 MDL_SHARED 锁 + MVCC 快照。累积的未提交事务阻塞后续 DDL/元数据操作，
而 lock_wait_timeout 默认 86400(24h)，可卡死 poller 达数小时(2026-08 生产事故：poller 停摆 15.7h)。
This commit is contained in:
yumoqing 2026-08-18 11:11:26 +08:00
parent d0d3e1b24c
commit 06b9762d4d
1 changed files with 6 additions and 0 deletions
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6
sqlor/dbpools.py
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@ -240,6 +240,12 @@ class DBPools(EventDispatcher):
yield sqlor yield sqlor
if sqlor and sqlor.dataChanged: if sqlor and sqlor.dataChanged:
await sqlor.commit() await sqlor.commit()
else:
# SELECT-only 事务也要结束：rollback 释放 MDL 锁和 MVCC 快照。
# 否则连接回池后事务未提交，持有 MDL_SHARED 阻塞后续 DDL/元数据操作，
# 而 lock_wait_timeout 默认 86400(24h)，可卡死 poller 达数小时。
# (2026-08 生产事故：poller 停摆 15.7h，根因即此)
await sqlor.rollback()
except BaseException as e: except BaseException as e:
self.e_except = e self.e_except = e
if not isinstance(e, asyncio.CancelledError): if not isinstance(e, asyncio.CancelledError):