Reconcile child summaries correctly

dev/cluster/client1.hcl

@@ -10,7 +10,6 @@ name = "client1"
 # Enable the client
 client {
   enabled = true
-
   server_join {
     retry_join = ["127.0.0.1:4647", "127.0.0.1:5647", "127.0.0.1:6647"]
   }

nomad/fsm.go

@@ -1401,6 +1401,11 @@ func (n *nomadFSM) reconcileQueuedAllocations(index uint64) error {
 			break
 		}
 		job := rawJob.(*structs.Job)
+
+		// Nothing to do for queued allocations if the job is a parent periodic/parameterized job
+		if job.IsParameterized() || job.IsPeriodic() {
+			continue
+		}
 		planner := &scheduler.Harness{
 			State: &snap.StateStore,
 		}

nomad/fsm_test.go

@@ -2816,6 +2816,78 @@ func TestFSM_ReconcileSummaries(t *testing.T) {
 	}
 }
 
+// COMPAT: Remove in 0.11
+func TestFSM_ReconcileParentJobSummary(t *testing.T) {
+	// This test exercises code to handle https://github.com/hashicorp/nomad/issues/3886
+	t.Parallel()
+
+	require := require.New(t)
+	// Add some state
+	fsm := testFSM(t)
+	state := fsm.State()
+
+	// Add a node
+	node := mock.Node()
+	state.UpsertNode(800, node)
+
+	// Make a parameterized job
+	job1 := mock.BatchJob()
+	job1.ID = "test"
+	job1.ParameterizedJob = &structs.ParameterizedJobConfig{
+		Payload: "random",
+	}
+	job1.TaskGroups[0].Count = 1
+	state.UpsertJob(1000, job1)
+
+	// Make a child job
+	childJob := job1.Copy()
+	childJob.ID = job1.ID + "dispatch-23423423"
+	childJob.ParentID = job1.ID
+	childJob.Dispatched = true
+	childJob.Status = structs.JobStatusRunning
+
+	// Create an alloc for child job
+	alloc := mock.Alloc()
+	alloc.NodeID = node.ID
+	alloc.Job = childJob
+	alloc.JobID = childJob.ID
+	alloc.ClientStatus = structs.AllocClientStatusRunning
+
+	state.UpsertJob(1010, childJob)
+	state.UpsertAllocs(1011, []*structs.Allocation{alloc})
+
+	// Make the summary incorrect in the state store
+	summary, err := state.JobSummaryByID(nil, job1.Namespace, job1.ID)
+	require.Nil(err)
+
+	summary.Children = nil
+	summary.Summary = make(map[string]structs.TaskGroupSummary)
+	summary.Summary["web"] = structs.TaskGroupSummary{
+		Queued: 1,
+	}
+
+	req := structs.GenericRequest{}
+	buf, err := structs.Encode(structs.ReconcileJobSummariesRequestType, req)
+	require.Nil(err)
+
+	resp := fsm.Apply(makeLog(buf))
+	require.Nil(resp)
+
+	ws := memdb.NewWatchSet()
+	out1, _ := state.JobSummaryByID(ws, job1.Namespace, job1.ID)
+	expected := structs.JobSummary{
+		JobID:       job1.ID,
+		Namespace:   job1.Namespace,
+		Summary:     make(map[string]structs.TaskGroupSummary),
+		CreateIndex: 1000,
+		ModifyIndex: out1.ModifyIndex,
+		Children: &structs.JobChildrenSummary{
+			Running: 1,
+		},
+	}
+	require.Equal(&expected, out1)
+}
+
 func TestFSM_LeakedDeployments(t *testing.T) {
 	t.Parallel()
 	require := require.New(t)

nomad/state/state_store.go

@@ -6,6 +6,8 @@ import (
 	"sort"
 	"time"
 
+	"reflect"
+
 	log "github.com/hashicorp/go-hclog"
 	"github.com/hashicorp/go-memdb"
 	multierror "github.com/hashicorp/go-multierror"
@@ -3049,12 +3051,86 @@ func (s *StateStore) ReconcileJobSummaries(index uint64) error {
 	if err != nil {
 		return err
 	}
+	// COMPAT: Remove after 0.11
+	// Iterate over jobs to build a list of parent jobs and their children
+	parentMap := make(map[string][]*structs.Job)
 	for {
 		rawJob := iter.Next()
 		if rawJob == nil {
 			break
 		}
 		job := rawJob.(*structs.Job)
+		if job.ParentID != "" {
+			children := parentMap[job.ParentID]
+			children = append(children, job)
+			parentMap[job.ParentID] = children
+		}
+	}
+
+	// Get all the jobs again
+	iter, err = txn.Get("jobs", "id")
+	if err != nil {
+		return err
+	}
+
+	for {
+		rawJob := iter.Next()
+		if rawJob == nil {
+			break
+		}
+		job := rawJob.(*structs.Job)
+
+		if job.IsParameterized() || job.IsPeriodic() {
+			// COMPAT: Remove after 0.11
+
+			// The following block of code fixes incorrect child summaries due to a bug
+			// See https://github.com/hashicorp/nomad/issues/3886 for details
+			rawSummary, err := txn.First("job_summary", "id", job.Namespace, job.ID)
+			if err != nil {
+				return err
+			}
+			if rawSummary == nil {
+				continue
+			}
+
+			oldSummary := rawSummary.(*structs.JobSummary)
+
+			// Create an empty summary
+			summary := &structs.JobSummary{
+				JobID:     job.ID,
+				Namespace: job.Namespace,
+				Summary:   make(map[string]structs.TaskGroupSummary),
+				Children:  &structs.JobChildrenSummary{},
+			}
+
+			// Iterate over children of this job if any to fix summary counts
+			children := parentMap[job.ID]
+			for _, childJob := range children {
+				switch childJob.Status {
+				case structs.JobStatusPending:
+					summary.Children.Pending++
+				case structs.JobStatusDead:
+					summary.Children.Dead++
+				case structs.JobStatusRunning:
+					summary.Children.Running++
+				}
+			}
+
+			// Insert the job summary if its different
+			if !reflect.DeepEqual(summary, oldSummary) {
+				// Set the create index of the summary same as the job's create index
+				// and the modify index to the current index
+				summary.CreateIndex = job.CreateIndex
+				summary.ModifyIndex = index
+
+				if err := txn.Insert("job_summary", summary); err != nil {
+					return fmt.Errorf("error inserting job summary: %v", err)
+				}
+			}
+
+			// Done with handling a parent job, continue to next
+			continue
+		}
 
 		// Create a job summary for the job
 		summary := &structs.JobSummary{

nomad/state/state_store_test.go

@@ -4354,6 +4354,95 @@ func TestStateStore_ReconcileJobSummary(t *testing.T) {
 	}
 }
 
+func TestStateStore_ReconcileParentJobSummary(t *testing.T) {
+	t.Parallel()
+	require := require.New(t)
+	state := testStateStore(t)
+
+	// Add a node
+	node := mock.Node()
+	state.UpsertNode(80, node)
+
+	// Make a parameterized job
+	job1 := mock.BatchJob()
+	job1.ID = "test"
+	job1.ParameterizedJob = &structs.ParameterizedJobConfig{
+		Payload: "random",
+	}
+	job1.TaskGroups[0].Count = 1
+	state.UpsertJob(100, job1)
+
+	// Make a child job
+	childJob := job1.Copy()
+	childJob.ID = job1.ID + "dispatch-23423423"
+	childJob.ParentID = job1.ID
+	childJob.Dispatched = true
+	childJob.Status = structs.JobStatusRunning
+
+	// Make some allocs for child job
+	alloc := mock.Alloc()
+	alloc.NodeID = node.ID
+	alloc.Job = childJob
+	alloc.JobID = childJob.ID
+	alloc.ClientStatus = structs.AllocClientStatusRunning
+
+	alloc2 := mock.Alloc()
+	alloc2.NodeID = node.ID
+	alloc2.Job = childJob
+	alloc2.JobID = childJob.ID
+	alloc2.ClientStatus = structs.AllocClientStatusFailed
+
+	require.Nil(state.UpsertJob(110, childJob))
+	require.Nil(state.UpsertAllocs(111, []*structs.Allocation{alloc, alloc2}))
+
+	// Make the summary incorrect in the state store
+	summary, err := state.JobSummaryByID(nil, job1.Namespace, job1.ID)
+	require.Nil(err)
+
+	summary.Children = nil
+	summary.Summary = make(map[string]structs.TaskGroupSummary)
+	summary.Summary["web"] = structs.TaskGroupSummary{
+		Queued: 1,
+	}
+
+	// Delete the child job summary
+	state.DeleteJobSummary(125, childJob.Namespace, childJob.ID)
+
+	state.ReconcileJobSummaries(120)
+
+	ws := memdb.NewWatchSet()
+
+	// Verify parent summary is corrected
+	summary, _ = state.JobSummaryByID(ws, alloc.Namespace, job1.ID)
+	expectedSummary := structs.JobSummary{
+		JobID:     job1.ID,
+		Namespace: job1.Namespace,
+		Summary:   make(map[string]structs.TaskGroupSummary),
+		Children: &structs.JobChildrenSummary{
+			Running: 1,
+		},
+		CreateIndex: 100,
+		ModifyIndex: 120,
+	}
+	require.Equal(&expectedSummary, summary)
+
+	// Verify child job summary is also correct
+	childSummary, _ := state.JobSummaryByID(ws, childJob.Namespace, childJob.ID)
+	expectedChildSummary := structs.JobSummary{
+		JobID:     childJob.ID,
+		Namespace: childJob.Namespace,
+		Summary: map[string]structs.TaskGroupSummary{
+			"web": {
+				Running: 1,
+				Failed:  1,
+			},
+		},
+		CreateIndex: 110,
+		ModifyIndex: 120,
+	}
+	require.Equal(&expectedChildSummary, childSummary)
+}
+
 func TestStateStore_UpdateAlloc_JobNotPresent(t *testing.T) {
 	state := testStateStore(t)