Summary:
In D1515, I introduced some excessively-complicated semantics for detecting
connections that are lost while transactional. These semantics cause us to
reenter establishConnection() and establish twice as many connections as we need
in the common case.
We don't need a hook there at all -- it's sufficient to throw the exception
rather than retrying the query when we encounter it. This doesn't have
reentrancy problems.
Test Plan:
- Added some encapsulation-violating hooks and a unit test for them
- Verified we no longer double-connect.
Reviewers: btrahan, nh
Reviewed By: btrahan
CC: aran, epriestley
Maniphest Tasks: T835
Differential Revision: https://secure.phabricator.com/D1576
4ac29d108c