|CC:||david [...] justatheory.com|
|Subject:||Behaviour of DBD::Pg ping() doesn't match DBI spec. It doesn't check the "database server is still running" in some cases.|
The DBD::Pg docs define the ping() method as "check the validity of a database handle" and it returns true in some cases *without communicating with the db server*. The DBI docs define the ping method as checking that "... the database server is still running and the connection to it is still working". I've been debugging a problem with code that's using DBIx::Connector in 'fixup' mode where DBIx::Connector didn't recover after a database crash. As fas a libpq was concerned the connection was within a transaction *so it returned true* without checking that "the database server is still running and the connection to it is still working". This meant a critical service went down and stayed down after the db restarted.