When using a meta-tracker in Launchpad (tracker that contains other trackers) this tracker is typically empty of bugs.
So, when calling the specific function "get_last_modification_date" in backend lp.py, the value None is returns, and the whole process starts from scratch. Although there are not duplicated bugs, this took around a couple of days in specific trackers such as OpenStack.
When using a meta-tracker in Launchpad (tracker that contains other trackers) this tracker is typically empty of bugs.
So, when calling the specific function "get_last_modification_date" in backend lp.py, the value None is returns, and the whole process starts from scratch. Although there are not duplicated bugs, this took around a couple of days in specific trackers such as OpenStack.