Garbage collect the completed workflow after persisted to database

backend/Dockerfile.persistenceagent

@@ -17,4 +17,7 @@ COPY --from=builder /go/src/github.com/kubeflow/pipelines/third_party/license.tx
 
 ENV NAMESPACE ""
 
-CMD persistence_agent --logtostderr=true --namespace=${NAMESPACE}
+# Set Workflow TTL to 7 days
+ENV TTL_SECONDS_AFTER_WORKFLOW_FINISH 604800
+
+CMD persistence_agent --logtostderr=true --namespace=${NAMESPACE} --ttlSecondsAfterWorkflowFinish=${TTL_SECONDS_AFTER_WORKFLOW_FINISH}

backend/src/agent/persistence/main.go

@@ -31,28 +31,30 @@ import (
 )
 
 var (
-	masterURL                   string
-	kubeconfig                  string
-	initializeTimeout           time.Duration
-	timeout                     time.Duration
-	mlPipelineAPIServerName     string
-	mlPipelineAPIServerPort     string
-	mlPipelineAPIServerBasePath string
-	mlPipelineServiceHttpPort   string
-	mlPipelineServiceGRPCPort   string
-	namespace                   string
+	masterURL                     string
+	kubeconfig                    string
+	initializeTimeout             time.Duration
+	timeout                       time.Duration
+	mlPipelineAPIServerName       string
+	mlPipelineAPIServerPort       string
+	mlPipelineAPIServerBasePath   string
+	mlPipelineServiceHttpPort     string
+	mlPipelineServiceGRPCPort     string
+	namespace                     string
+	ttlSecondsAfterWorkflowFinish int64
 )
 
 const (
-	kubeconfigFlagName                  = "kubeconfig"
-	masterFlagName                      = "master"
-	initializationTimeoutFlagName       = "initializeTimeout"
-	timeoutFlagName                     = "timeout"
-	mlPipelineAPIServerBasePathFlagName = "mlPipelineAPIServerBasePath"
-	mlPipelineAPIServerNameFlagName     = "mlPipelineAPIServerName"
-	mlPipelineAPIServerHttpPortFlagName = "mlPipelineServiceHttpPort"
-	mlPipelineAPIServerGRPCPortFlagName = "mlPipelineServiceGRPCPort"
-	namespaceFlagName                   = "namespace"
+	kubeconfigFlagName                    = "kubeconfig"
+	masterFlagName                        = "master"
+	initializationTimeoutFlagName         = "initializeTimeout"
+	timeoutFlagName                       = "timeout"
+	mlPipelineAPIServerBasePathFlagName   = "mlPipelineAPIServerBasePath"
+	mlPipelineAPIServerNameFlagName       = "mlPipelineAPIServerName"
+	mlPipelineAPIServerHttpPortFlagName   = "mlPipelineServiceHttpPort"
+	mlPipelineAPIServerGRPCPortFlagName   = "mlPipelineServiceGRPCPort"
+	namespaceFlagName                     = "namespace"
+	ttlSecondsAfterWorkflowFinishFlagName = "ttlSecondsAfterWorkflowFinish"
 )
 
 func main() {
@@ -122,4 +124,5 @@ func init() {
 	flag.StringVar(&mlPipelineAPIServerBasePath, mlPipelineAPIServerBasePathFlagName,
 		"/apis/v1beta1", "The base path for the ML pipeline API server.")
 	flag.StringVar(&namespace, namespaceFlagName, "", "The namespace name used for Kubernetes informers to obtain the listers.")
+	flag.Int64Var(&ttlSecondsAfterWorkflowFinish, ttlSecondsAfterWorkflowFinishFlagName, 604800 /* 7 days */, "The TTL for Argo workflow to persist after workflow finish.")
 }

backend/src/agent/persistence/persistence_agent.go

@@ -44,10 +44,10 @@ type PersistenceAgent struct {
 
 // NewPersistenceAgent returns a new persistence agent.
 func NewPersistenceAgent(
-	swfInformerFactory swfinformers.SharedInformerFactory,
-	workflowInformerFactory workflowinformers.SharedInformerFactory,
-	pipelineClient *client.PipelineClient,
-	time util.TimeInterface) *PersistenceAgent {
+		swfInformerFactory swfinformers.SharedInformerFactory,
+		workflowInformerFactory workflowinformers.SharedInformerFactory,
+		pipelineClient *client.PipelineClient,
+		time util.TimeInterface) *PersistenceAgent {
 	// obtain references to shared informers
 	swfInformer := swfInformerFactory.Scheduledworkflow().V1beta1().ScheduledWorkflows()
 	workflowInformer := workflowInformerFactory.Argoproj().V1alpha1().Workflows()
@@ -64,7 +64,7 @@ func NewPersistenceAgent(
 
 	workflowWorker := worker.NewPersistenceWorker(time, workflowregister.Kind,
 		workflowInformer.Informer(), true,
-		worker.NewWorkflowSaver(workflowClient, pipelineClient))
+		worker.NewWorkflowSaver(workflowClient, pipelineClient, ttlSecondsAfterWorkflowFinish))
 
 	agent := &PersistenceAgent{
 		swfClient:      swfClient,

backend/src/agent/persistence/worker/persistence_worker_test.go

@@ -54,7 +54,7 @@ func TestPersistenceWorker_Success(t *testing.T) {
 	pipelineClient := client.NewPipelineClientFake()
 
 	// Set up peristence worker
-	saver := NewWorkflowSaver(workflowClient, pipelineClient)
+	saver := NewWorkflowSaver(workflowClient, pipelineClient, 100)
 	eventHandler := NewFakeEventHandler()
 	worker := NewPersistenceWorker(
 		util.NewFakeTimeForEpoch(),
@@ -84,7 +84,7 @@ func TestPersistenceWorker_NotFoundError(t *testing.T) {
 	pipelineClient := client.NewPipelineClientFake()
 
 	// Set up peristence worker
-	saver := NewWorkflowSaver(workflowClient, pipelineClient)
+	saver := NewWorkflowSaver(workflowClient, pipelineClient, 100)
 	eventHandler := NewFakeEventHandler()
 	worker := NewPersistenceWorker(
 		util.NewFakeTimeForEpoch(),
@@ -115,7 +115,7 @@ func TestPersistenceWorker_GetWorklowError(t *testing.T) {
 	pipelineClient := client.NewPipelineClientFake()
 
 	// Set up peristence worker
-	saver := NewWorkflowSaver(workflowClient, pipelineClient)
+	saver := NewWorkflowSaver(workflowClient, pipelineClient, 100)
 	eventHandler := NewFakeEventHandler()
 	worker := NewPersistenceWorker(
 		util.NewFakeTimeForEpoch(),
@@ -148,7 +148,7 @@ func TestPersistenceWorker_ReportWorkflowRetryableError(t *testing.T) {
 		"My Retriable Error"))
 
 	// Set up peristence worker
-	saver := NewWorkflowSaver(workflowClient, pipelineClient)
+	saver := NewWorkflowSaver(workflowClient, pipelineClient, 100)
 	eventHandler := NewFakeEventHandler()
 	worker := NewPersistenceWorker(
 		util.NewFakeTimeForEpoch(),
@@ -181,7 +181,7 @@ func TestPersistenceWorker_ReportWorkflowNonRetryableError(t *testing.T) {
 		"My Permanent Error"))
 
 	// Set up peristence worker
-	saver := NewWorkflowSaver(workflowClient, pipelineClient)
+	saver := NewWorkflowSaver(workflowClient, pipelineClient, 100)
 	eventHandler := NewFakeEventHandler()
 	worker := NewPersistenceWorker(
 		util.NewFakeTimeForEpoch(),

backend/src/agent/persistence/worker/workflow_saver.go

@@ -19,21 +19,24 @@ import (
 	"github.com/kubeflow/pipelines/backend/src/common/util"
 	log "github.com/sirupsen/logrus"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
+	"time"
 )
 
 // WorkflowSaver provides a function to persist a workflow to a database.
 type WorkflowSaver struct {
-	client          client.WorkflowClientInterface
-	pipelineClient  client.PipelineClientInterface
-	metricsReporter *MetricsReporter
+	client                        client.WorkflowClientInterface
+	pipelineClient                client.PipelineClientInterface
+	metricsReporter               *MetricsReporter
+	ttlSecondsAfterWorkflowFinish int64
 }
 
 func NewWorkflowSaver(client client.WorkflowClientInterface,
-	pipelineClient client.PipelineClientInterface) *WorkflowSaver {
+		pipelineClient client.PipelineClientInterface, ttlSecondsAfterWorkflowFinish int64) *WorkflowSaver {
 	return &WorkflowSaver{
-		client:          client,
-		pipelineClient:  pipelineClient,
-		metricsReporter: NewMetricsReporter(pipelineClient),
+		client:                        client,
+		pipelineClient:                pipelineClient,
+		metricsReporter:               NewMetricsReporter(pipelineClient),
+		ttlSecondsAfterWorkflowFinish: ttlSecondsAfterWorkflowFinish,
 	}
 }
 
@@ -53,7 +56,12 @@ func (s *WorkflowSaver) Save(key string, namespace string, name string, nowEpoch
 			"Workflow (%s): transient failure: %v", key, err)
 
 	}
-
+	if wf.PersistedFinalState() && time.Now().Unix()-wf.FinishedAt() < s.ttlSecondsAfterWorkflowFinish {
+		// Skip persisting the workflow if the workflow is finished
+		// and the workflow hasn't being passing the TTL
+		log.Infof("Skip syncing Workflow (%v): workflow marked as persisted.", name)
+		return nil
+	}
 	// Save this Workflow to the database.
 	err = s.pipelineClient.ReportWorkflow(wf)
 	retry := util.HasCustomCode(err, util.CUSTOM_CODE_TRANSIENT)

backend/src/agent/persistence/worker/workflow_saver_test.go

@@ -17,6 +17,7 @@ package worker
 import (
 	"fmt"
 	"testing"
+	"time"
 
 	workflowapi "github.com/argoproj/argo/pkg/apis/workflow/v1alpha1"
 	"github.com/kubeflow/pipelines/backend/src/agent/persistence/client"
@@ -39,9 +40,7 @@ func TestWorkflow_Save_Success(t *testing.T) {
 
 	workflowFake.Put("MY_NAMESPACE", "MY_NAME", workflow)
 
-	saver := NewWorkflowSaver(
-		workflowFake,
-		pipelineFake)
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
 
 	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
 
@@ -53,9 +52,7 @@ func TestWorkflow_Save_NotFoundDuringGet(t *testing.T) {
 	workflowFake := client.NewWorkflowClientFake()
 	pipelineFake := client.NewPipelineClientFake()
 
-	saver := NewWorkflowSaver(
-		workflowFake,
-		pipelineFake)
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
 
 	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
 
@@ -70,9 +67,7 @@ func TestWorkflow_Save_ErrorDuringGet(t *testing.T) {
 
 	workflowFake.Put("MY_NAMESPACE", "MY_NAME", nil)
 
-	saver := NewWorkflowSaver(
-		workflowFake,
-		pipelineFake)
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
 
 	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
 
@@ -97,9 +92,7 @@ func TestWorkflow_Save_PermanentFailureWhileReporting(t *testing.T) {
 
 	workflowFake.Put("MY_NAMESPACE", "MY_NAME", workflow)
 
-	saver := NewWorkflowSaver(
-		workflowFake,
-		pipelineFake)
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
 
 	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
 
@@ -124,13 +117,73 @@ func TestWorkflow_Save_TransientFailureWhileReporting(t *testing.T) {
 
 	workflowFake.Put("MY_NAMESPACE", "MY_NAME", workflow)
 
-	saver := NewWorkflowSaver(
-		workflowFake,
-		pipelineFake)
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
 
 	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
 
 	assert.Equal(t, true, util.HasCustomCode(err, util.CUSTOM_CODE_TRANSIENT))
 	assert.NotNil(t, err)
 	assert.Contains(t, err.Error(), "transient failure")
 }
+
+func TestWorkflow_Save_SkippedDueToFinalStatue(t *testing.T) {
+	workflowFake := client.NewWorkflowClientFake()
+	pipelineFake := client.NewPipelineClientFake()
+
+	// Add this will result in failure unless reporting is skipped
+	pipelineFake.SetError(util.NewCustomError(fmt.Errorf("Error"), util.CUSTOM_CODE_PERMANENT,
+		"My Permanent Error"))
+
+	workflow := util.NewWorkflow(&workflowapi.Workflow{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: "MY_NAMESPACE",
+			Name:      "MY_NAME",
+			Labels:    map[string]string{util.LabelKeyWorkflowPersistedFinalState: "true"},
+		},
+		Status: workflowapi.WorkflowStatus{
+			FinishedAt: metav1.Now(),
+		},
+	})
+
+	workflowFake.Put("MY_NAMESPACE", "MY_NAME", workflow)
+
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 100)
+
+	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
+
+	assert.Equal(t, false, util.HasCustomCode(err, util.CUSTOM_CODE_TRANSIENT))
+	assert.Equal(t, nil, err)
+}
+
+func TestWorkflow_Save_FinalStatueNotSkippedDueToExceedTTL(t *testing.T) {
+	workflowFake := client.NewWorkflowClientFake()
+	pipelineFake := client.NewPipelineClientFake()
+
+	// Add this will result in failure unless reporting is skipped
+	pipelineFake.SetError(util.NewCustomError(fmt.Errorf("Error"), util.CUSTOM_CODE_PERMANENT,
+		"My Permanent Error"))
+
+	workflow := util.NewWorkflow(&workflowapi.Workflow{
+		ObjectMeta: metav1.ObjectMeta{
+			Namespace: "MY_NAMESPACE",
+			Name:      "MY_NAME",
+			Labels:    map[string]string{util.LabelKeyWorkflowPersistedFinalState: "true"},
+		},
+		Status: workflowapi.WorkflowStatus{
+			FinishedAt: metav1.Now(),
+		},
+	})
+
+	workflowFake.Put("MY_NAMESPACE", "MY_NAME", workflow)
+
+	saver := NewWorkflowSaver(workflowFake, pipelineFake, 1)
+
+	// Sleep 2 seconds to make sure workflow passed TTL
+	time.Sleep(2 * time.Second)
+
+	err := saver.Save("MY_KEY", "MY_NAMESPACE", "MY_NAME", 20)
+
+	assert.Equal(t, false, util.HasCustomCode(err, util.CUSTOM_CODE_TRANSIENT))
+	assert.NotNil(t, err)
+	assert.Contains(t, err.Error(), "permanent failure")
+}