# The LUCI Scheduler Service | |
The LUCI Scheduler Service periodically makes URL fetches, runs Swarming tasks | |
or DM quests. It uses luci-config to fetch per-project lists of cron jobs. It | |
tries to prevent concurrent execution of job invocations (i.e. an invocation | |
will not start if previous one is still running). | |
It's built on top of App Engine Task Queues service. | |
TODO(vadimsh): Explain the design. |