magento/magento2 — pull request #14 by brobie (2012-04-26 20:33:05+00:00)
Title: Adding dispatch of an event before and after applyAllUpdates()

This allows for the ability to put in a mechanism to prevent errors from
being displayed to users if more than one make a request in the same
span of time that the install/upgrade scripts are running.

This mechanism could be: waiting, sending to an separate page, etc.

Now, we would not have to turn on maintenance mode...potentially.