Merge pull request #2155 from hashicorp/f-cancel

Cancel blocked evals upon successful one for job

nomad/blocked_evals.go

@@ -39,8 +39,8 @@ type BlockedEvals struct {
 	capacityChangeCh chan *capacityUpdate
 
 	// jobs is the map of blocked job and is used to ensure that only one
-	// blocked eval exists for each job.
-	jobs map[string]struct{}
+	// blocked eval exists for each job. The value is the blocked evaluation ID.
+	jobs map[string]string
 
 	// unblockIndexes maps computed node classes to the index in which they were
 	// unblocked. This is used to check if an evaluation could have been
@@ -91,7 +91,7 @@ func NewBlockedEvals(evalBroker *EvalBroker) *BlockedEvals {
 		evalBroker:       evalBroker,
 		captured:         make(map[string]wrappedEval),
 		escaped:          make(map[string]wrappedEval),
-		jobs:             make(map[string]struct{}),
+		jobs:             make(map[string]string),
 		unblockIndexes:   make(map[string]uint64),
 		capacityChangeCh: make(chan *capacityUpdate, unblockBuffer),
 		duplicateCh:      make(chan struct{}, 1),
@@ -183,7 +183,7 @@ func (b *BlockedEvals) processBlock(eval *structs.Evaluation, token string) {
 
 	// Mark the job as tracked.
 	b.stats.TotalBlocked++
-	b.jobs[eval.JobID] = struct{}{}
+	b.jobs[eval.JobID] = eval.ID
 
 	// Wrap the evaluation, capturing its token.
 	wrapped := wrappedEval{
@@ -244,6 +244,40 @@ func (b *BlockedEvals) missedUnblock(eval *structs.Evaluation) bool {
 	return false
 }
 
+// Untrack causes any blocked evaluation for the passed job to be no longer
+// tracked. Untrack is called when there is a successful evaluation for the job
+// and a blocked evaluation is no longer needed.
+func (b *BlockedEvals) Untrack(jobID string) {
+	b.l.Lock()
+	defer b.l.Unlock()
+
+	// Do nothing if not enabled
+	if !b.enabled {
+		return
+	}
+
+	// Get the evaluation ID to cancel
+	evalID, ok := b.jobs[jobID]
+	if !ok {
+		// No blocked evaluation so exit
+		return
+	}
+
+	// Attempt to delete the evaluation
+	if w, ok := b.captured[evalID]; ok {
+		delete(b.jobs, w.eval.JobID)
+		delete(b.captured, evalID)
+		b.stats.TotalBlocked--
+	}
+
+	if w, ok := b.escaped[evalID]; ok {
+		delete(b.jobs, w.eval.JobID)
+		delete(b.escaped, evalID)
+		b.stats.TotalEscaped--
+		b.stats.TotalBlocked--
+	}
+}
+
 // Unblock causes any evaluation that could potentially make progress on a
 // capacity change on the passed computed node class to be enqueued into the
 // eval broker.
@@ -410,7 +444,7 @@ func (b *BlockedEvals) Flush() {
 	b.stats.TotalBlocked = 0
 	b.captured = make(map[string]wrappedEval)
 	b.escaped = make(map[string]wrappedEval)
-	b.jobs = make(map[string]struct{})
+	b.jobs = make(map[string]string)
 	b.duplicates = nil
 	b.capacityChangeCh = make(chan *capacityUpdate, unblockBuffer)
 	b.stopCh = make(chan struct{})

nomad/blocked_evals_test.go

@@ -484,3 +484,27 @@ func TestBlockedEvals_UnblockFailed(t *testing.T) {
 		t.Fatalf("bad: %#v", blockedStats)
 	}
 }
+
+func TestBlockedEvals_Untrack(t *testing.T) {
+	blocked, _ := testBlockedEvals(t)
+
+	// Create two blocked evals and add them to the blocked tracker.
+	e := mock.Eval()
+	e.Status = structs.EvalStatusBlocked
+	e.ClassEligibility = map[string]bool{"v1:123": false, "v1:456": false}
+	e.SnapshotIndex = 1000
+	blocked.Block(e)
+
+	// Verify block did track
+	bStats := blocked.Stats()
+	if bStats.TotalBlocked != 1 || bStats.TotalEscaped != 0 {
+		t.Fatalf("bad: %#v", bStats)
+	}
+
+	// Untrack and verify
+	blocked.Untrack(e.JobID)
+	bStats = blocked.Stats()
+	if bStats.TotalBlocked != 0 || bStats.TotalEscaped != 0 {
+		t.Fatalf("bad: %#v", bStats)
+	}
+}

nomad/fsm.go

@@ -350,6 +350,11 @@ func (n *nomadFSM) applyUpdateEval(buf []byte, index uint64) interface{} {
 			n.evalBroker.Enqueue(eval)
 		} else if eval.ShouldBlock() {
 			n.blockedEvals.Block(eval)
+		} else if eval.Status == structs.EvalStatusComplete &&
+			len(eval.FailedTGAllocs) == 0 {
+			// If we have a successful evaluation for a node, untrack any
+			// blocked evaluation
+			n.blockedEvals.Untrack(eval.JobID)
 		}
 	}
 	return nil

nomad/fsm_test.go

@@ -445,6 +445,114 @@ func TestFSM_UpdateEval_Blocked(t *testing.T) {
 	}
 }
 
+func TestFSM_UpdateEval_Untrack(t *testing.T) {
+	fsm := testFSM(t)
+	fsm.evalBroker.SetEnabled(true)
+	fsm.blockedEvals.SetEnabled(true)
+
+	// Mark an eval as blocked.
+	bEval := mock.Eval()
+	bEval.ClassEligibility = map[string]bool{"v1:123": true}
+	fsm.blockedEvals.Block(bEval)
+
+	// Create a successful eval for the same job
+	eval := mock.Eval()
+	eval.JobID = bEval.JobID
+	eval.Status = structs.EvalStatusComplete
+
+	req := structs.EvalUpdateRequest{
+		Evals: []*structs.Evaluation{eval},
+	}
+	buf, err := structs.Encode(structs.EvalUpdateRequestType, req)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	resp := fsm.Apply(makeLog(buf))
+	if resp != nil {
+		t.Fatalf("resp: %v", resp)
+	}
+
+	// Verify we are registered
+	out, err := fsm.State().EvalByID(eval.ID)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if out == nil {
+		t.Fatalf("not found!")
+	}
+	if out.CreateIndex != 1 {
+		t.Fatalf("bad index: %d", out.CreateIndex)
+	}
+
+	// Verify the eval wasn't enqueued
+	stats := fsm.evalBroker.Stats()
+	if stats.TotalReady != 0 {
+		t.Fatalf("bad: %#v %#v", stats, out)
+	}
+
+	// Verify the eval was untracked in the blocked tracker.
+	bStats := fsm.blockedEvals.Stats()
+	if bStats.TotalBlocked != 0 {
+		t.Fatalf("bad: %#v %#v", bStats, out)
+	}
+}
+
+func TestFSM_UpdateEval_NoUntrack(t *testing.T) {
+	fsm := testFSM(t)
+	fsm.evalBroker.SetEnabled(true)
+	fsm.blockedEvals.SetEnabled(true)
+
+	// Mark an eval as blocked.
+	bEval := mock.Eval()
+	bEval.ClassEligibility = map[string]bool{"v1:123": true}
+	fsm.blockedEvals.Block(bEval)
+
+	// Create a successful eval for the same job but with placement failures
+	eval := mock.Eval()
+	eval.JobID = bEval.JobID
+	eval.Status = structs.EvalStatusComplete
+	eval.FailedTGAllocs = make(map[string]*structs.AllocMetric)
+	eval.FailedTGAllocs["test"] = new(structs.AllocMetric)
+
+	req := structs.EvalUpdateRequest{
+		Evals: []*structs.Evaluation{eval},
+	}
+	buf, err := structs.Encode(structs.EvalUpdateRequestType, req)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	resp := fsm.Apply(makeLog(buf))
+	if resp != nil {
+		t.Fatalf("resp: %v", resp)
+	}
+
+	// Verify we are registered
+	out, err := fsm.State().EvalByID(eval.ID)
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+	if out == nil {
+		t.Fatalf("not found!")
+	}
+	if out.CreateIndex != 1 {
+		t.Fatalf("bad index: %d", out.CreateIndex)
+	}
+
+	// Verify the eval wasn't enqueued
+	stats := fsm.evalBroker.Stats()
+	if stats.TotalReady != 0 {
+		t.Fatalf("bad: %#v %#v", stats, out)
+	}
+
+	// Verify the eval was not untracked in the blocked tracker.
+	bStats := fsm.blockedEvals.Stats()
+	if bStats.TotalBlocked != 1 {
+		t.Fatalf("bad: %#v %#v", bStats, out)
+	}
+}
+
 func TestFSM_DeleteEval(t *testing.T) {
 	fsm := testFSM(t)
 

nomad/state/schema.go

@@ -214,9 +214,17 @@ func evalTableSchema() *memdb.TableSchema {
 				Name:         "job",
 				AllowMissing: false,
 				Unique:       false,
-				Indexer: &memdb.StringFieldIndex{
-					Field:     "JobID",
-					Lowercase: true,
+				Indexer: &memdb.CompoundIndex{
+					Indexes: []memdb.Indexer{
+						&memdb.StringFieldIndex{
+							Field:     "JobID",
+							Lowercase: true,
+						},
+						&memdb.StringFieldIndex{
+							Field:     "Status",
+							Lowercase: true,
+						},
+					},
 				},
 			},
 		},

nomad/state/state_store.go

@@ -672,7 +672,7 @@ func (s *StateStore) PeriodicLaunches() (memdb.ResultIterator, error) {
 	return iter, nil
 }
 
-// UpsertEvaluation is used to upsert an evaluation
+// UpsertEvals is used to upsert a set of evaluations
 func (s *StateStore) UpsertEvals(index uint64, evals []*structs.Evaluation) error {
 	txn := s.db.Txn(true)
 	defer txn.Abort()
@@ -685,7 +685,7 @@ func (s *StateStore) UpsertEvals(index uint64, evals []*structs.Evaluation) erro
 	for _, eval := range evals {
 		watcher.Add(watch.Item{Eval: eval.ID})
 		watcher.Add(watch.Item{EvalJob: eval.JobID})
-		if err := s.nestedUpsertEval(txn, index, eval); err != nil {
+		if err := s.nestedUpsertEval(txn, watcher, index, eval); err != nil {
 			return err
 		}
 
@@ -703,7 +703,7 @@ func (s *StateStore) UpsertEvals(index uint64, evals []*structs.Evaluation) erro
 }
 
 // nestedUpsertEvaluation is used to nest an evaluation upsert within a transaction
-func (s *StateStore) nestedUpsertEval(txn *memdb.Txn, index uint64, eval *structs.Evaluation) error {
+func (s *StateStore) nestedUpsertEval(txn *memdb.Txn, watcher watch.Items, index uint64, eval *structs.Evaluation) error {
 	// Lookup the evaluation
 	existing, err := txn.First("evals", "id", eval.ID)
 	if err != nil {
@@ -751,6 +751,37 @@ func (s *StateStore) nestedUpsertEval(txn *memdb.Txn, index uint64, eval *struct
 		}
 	}
 
+	// Check if the job has any blocked evaluations and cancel them
+	if eval.Status == structs.EvalStatusComplete && len(eval.FailedTGAllocs) == 0 {
+		// Get the blocked evaluation for a job if it exists
+		iter, err := txn.Get("evals", "job", eval.JobID, structs.EvalStatusBlocked)
+		if err != nil {
+			return fmt.Errorf("failed to get blocked evals for job %q", eval.JobID, err)
+		}
+
+		var blocked []*structs.Evaluation
+		for {
+			raw := iter.Next()
+			if raw == nil {
+				break
+			}
+			blocked = append(blocked, raw.(*structs.Evaluation))
+		}
+
+		// Go through and update the evals
+		for _, eval := range blocked {
+			newEval := eval.Copy()
+			newEval.Status = structs.EvalStatusCancelled
+			newEval.StatusDescription = fmt.Sprintf("evaluation %q successful", newEval.ID)
+			newEval.ModifyIndex = index
+			if err := txn.Insert("evals", newEval); err != nil {
+				return fmt.Errorf("eval insert failed: %v", err)
+			}
+
+			watcher.Add(watch.Item{Eval: newEval.ID})
+		}
+	}
+
 	// Insert the eval
 	if err := txn.Insert("evals", eval); err != nil {
 		return fmt.Errorf("eval insert failed: %v", err)
@@ -855,7 +886,7 @@ func (s *StateStore) EvalsByJob(jobID string) ([]*structs.Evaluation, error) {
 	txn := s.db.Txn(false)
 
 	// Get an iterator over the node allocations
-	iter, err := txn.Get("evals", "job", jobID)
+	iter, err := txn.Get("evals", "job_prefix", jobID)
 	if err != nil {
 		return nil, err
 	}
@@ -1603,7 +1634,7 @@ func (s *StateStore) getJobStatus(txn *memdb.Txn, job *structs.Job, evalDelete b
 		}
 	}
 
-	evals, err := txn.Get("evals", "job", job.ID)
+	evals, err := txn.Get("evals", "job_prefix", job.ID)
 	if err != nil {
 		return "", err
 	}