Run deployment garbage collector on an interval

Fixes #3244

CHANGELOG.md

@@ -13,6 +13,7 @@ IMPROVEMENTS:
 
 BUG FIXES:
  * core: Fix restoration of stopped periodic jobs [GH-3201]
+ * core: Run deployment garbage collector on an interval [GH-3267]
  * core: Fix issue where node-drain with complete batch allocation would create
    replacement [GH-3217]
  * core: Fix issue in which batch allocations from previous job versions may not

nomad/leader.go

@@ -363,6 +363,8 @@ func (s *Server) schedulePeriodic(stopCh chan struct{}) {
 	defer nodeGC.Stop()
 	jobGC := time.NewTicker(s.config.JobGCInterval)
 	defer jobGC.Stop()
+	deploymentGC := time.NewTicker(s.config.DeploymentGCInterval)
+	defer deploymentGC.Stop()
 
 	// getLatest grabs the latest index from the state store. It returns true if
 	// the index was retrieved successfully.
@@ -391,6 +393,10 @@ func (s *Server) schedulePeriodic(stopCh chan struct{}) {
 			if index, ok := getLatest(); ok {
 				s.evalBroker.Enqueue(s.coreJobEval(structs.CoreJobJobGC, index))
 			}
+		case <-deploymentGC.C:
+			if index, ok := getLatest(); ok {
+				s.evalBroker.Enqueue(s.coreJobEval(structs.CoreJobDeploymentGC, index))
+			}
 		case <-stopCh:
 			return
 		}