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Re: Waiting for table metadata lock
Posted by: Jon Ribbens
Date: January 08, 2013 05:15AM

It turns out that the problem was due to surprising 'feature' changes of two different packages.

Firstly, in 5.5, MySQL has changed so that, even though MyISAM tables do not support transactions, if you use any DDL statements (even just "DESCRIBE"), they get locked by transactions anyway.

Secondly, mysql-python secretly and non-optionally issues a "SET AUTOCOMMIT=0" instruction when it connects to the MySQL server.

It's not very nice, but I've managed to work-around the problem by hacking the mysql-python module to turn autocommit back on again.

Thanks for your suggestions.

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