Notice: Undefined index: database in StorageLock->__construct() (line 869 of storage.module)

When acquiring a database lock, Storage API assumes that the database name can be found in global $databases['default']['default']['database']. I would venture to guess that this assumption works for the majority of configurations. This assumption is not valid, however, when the installation uses a database driver such as AutoSlave for Master/Slave database read/write splitting.

It's more of an annoyance than anything, since it fills up my logs. It also means that, in the unlikely event that multiple drupal sites share a database, but use AutoSlave (or a similar configuration), the database locks will not be properly namespaced.