Google has inadvertently spammed its users after running out of disk space required for the notification causing the system to send emails to users on a loop. Vic Gundotra, a senior vice president, posted an apology on his Google+1 profile saying:
Please accept our apologies for the spam we caused this afternoon.
For about 80 minutes we ran out of disk space on the service that keeps track of notifications. Hence our system continued to try sending notifications. Over, and over again. Yikes.
We didn’t expect to hit these high thresholds so quickly, but we should have.
Thank you for helping us during this field trial, and once again, we are very sorry for the spam.
Google has also had to limit the amount of invitations sent out for Google+, temporarily stopping the usage of any sent invites saying ‘we’ve temporarily exceeded our capacity. Please try again soon.