It would be great to teach tctalker how to walk the graph and cancel all pending/running tasks in case we need to cancel all of them for some reason. Tracking bug for tctalker is bug 1227240
Added PR here - https://github.com/mozilla/tctalker/pull/3
Merged the PR, tested it throughout the staging instances - works just fine. I am closing this bug.
Bumped version 0.0.7 at https://pypi.python.org/pypi/tctalker with these changes.