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    <p><strong>See EDIT at the bottom for tested solution</strong></p> <p>I didn't try it, but maybe using <strong><a href="http://www.sqlalchemy.org/docs/reference/sqlalchemy/interfaces.html#sqlalchemy.interfaces.PoolListener" rel="noreferrer">PoolListener</a></strong> is a way to go?</p> <p>You could do something like this:</p> <pre><code>class MyListener(sqlalchemy.interfaces.PoolListener): def __init__(self): self.retried = False def checkout(self, dbapi_con, con_record, con_proxy): try: dbapi_con.info() # is there any better way to simply check if connection to mysql is alive? except sqlalchemy.exc.OperationalError: if self.retried: self.retried = False raise # we do nothing self.retried = True raise sqlalchemy.exc.DisconnectionError # next, code according to documentation linked above follows e = create_engine("url://", listeners=[MyListener()]) </code></pre> <p>This way every time connection is about to be checked out from the pool we test if it's actually connected to the server. If not, we give sqlalchemy one chance to reconnect. After that, if problem is still there, we let it go.</p> <p>PS: I didn't test if this works.</p> <p>Edit: As for the Pylons, modifications to the engine initialization showed above would need to be done in <strike>your_app.model.init_model (Pylons 0.9.7) or </strike> your_app.config.environment.load_environment <strike>(Pylons 1.0)</strike> function - <strike>these are</strike> this is the <strike>places</strike> place where engine instance gets created.</p> <p><strong>EDIT</strong></p> <p><strong>Ok. I was able to reproduce described situation. The code above needs some changes in order to work. Below is how it should be done. Also it doesn't matter whether it's 0.9.7 or 1.0.</strong></p> <p>You need to edit your_app/config/environment.py. Put these exports at top of the file:</p> <pre><code>import sqlalchemy import sqlalchemy.interfaces import _mysql_exceptions </code></pre> <p>And the end of load_environment function should look like that:</p> <pre><code>class MyListener(sqlalchemy.interfaces.PoolListener): def __init__(self): self.retried = False def checkout(self, dbapi_con, con_record, con_proxy): try: dbapi_con.cursor().execute('select now()') except _mysql_exceptions.OperationalError: if self.retried: self.retried = False raise self.retried = True raise sqlalchemy.exc.DisconnectionError config['sqlalchemy.listeners'] = [MyListener()] engine = engine_from_config(config, 'sqlalchemy.') init_model(engine) </code></pre> <p>This time I was able to test it (on Pylons 1.0 + SQLAlchemy 0.6.1) and <strong>it works.</strong> :)</p>
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    1. COThanks, similar soultion is here: http://www.mail-archive.com/sqlalchemy@googlegroups.com/msg15079.html and it works for me.
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    2. CODidn't see your edit :)
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    3. CONote for SQLAlchemy 0.7 - `PoolListener` is deprecated, but The same solution can be implemented using the new [event system](http://docs.sqlalchemy.org/en/latest/core/pooling.html#disconnect-handling-pessimistic).
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