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Jul 31 - Fix database issue which leads to the app dies

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nngo
2026-07-31 10:07:07 -04:00
parent 24d48f5d34
commit a7655810d8
3 changed files with 72 additions and 8 deletions
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config.py
+13
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@@ -41,8 +41,21 @@ class Config:
'pool_timeout': int(os.environ.get('SQLALCHEMY_ENGINE_OPTIONS_POOL_TIMEOUT', '20')),
'pool_recycle': int(os.environ.get('SQLALCHEMY_ENGINE_OPTIONS_POOL_RECYCLE', '3600')),
'max_overflow': int(os.environ.get('SQLALCHEMY_ENGINE_OPTIONS_MAX_OVERFLOW', '20')),
# Validate a pooled connection before handing it out. Without this, every
# connection opened while mysqld was down/restarting stays in the pool as a
# dead socket and keeps failing requests long after MySQL has recovered.
'pool_pre_ping': True,
}
# ------------------------------------------------------------------ #
# Startup DB-connect retry (server reboot: gunicorn may start before mysqld)
# ------------------------------------------------------------------ #
# Observed worst case: an unattended-upgrades restart of mysql-server left
# mysqld down for ~15s. 8 attempts x 3s covers ~21s of downtime while
# staying inside gunicorn's 30s worker-boot timeout.
DB_STARTUP_RETRY_ATTEMPTS = int(os.environ.get('DB_STARTUP_RETRY_ATTEMPTS', '8'))
DB_STARTUP_RETRY_DELAY = int(os.environ.get('DB_STARTUP_RETRY_DELAY', '3'))
# ------------------------------------------------------------------ #
# Session / cookies
# ------------------------------------------------------------------ #