cordinator(ticdc): Fix Puller Resolved TS Lag Calculation and Deprecate current_ts Field in Stats (pingcap#11624)

close pingcap#11561

Author: wlwilliamx

cdc/processor/processor.go

@@ -378,11 +378,9 @@ func (p *processor) getStatsFromSourceManagerAndSinkManager(
 	span tablepb.Span, sinkStats sinkmanager.TableStats,
 ) tablepb.Stats {
 	pullerStats := p.sourceManager.r.GetTablePullerStats(span)
-	now := p.upstream.PDClock.CurrentTime()
 
 	stats := tablepb.Stats{
 		RegionCount: pullerStats.RegionCount,
-		CurrentTs:   oracle.ComposeTS(oracle.GetPhysical(now), 0),
 		BarrierTs:   sinkStats.BarrierTs,
 		StageCheckpoints: map[string]tablepb.Checkpoint{
 			"puller-ingress": {

cdc/processor/tablepb/table.proto

@@ -65,7 +65,7 @@ message Stats {
     // Number of captured regions.
     uint64 region_count = 1;
     // The current timestamp from the table's point of view.
-    uint64 current_ts = 2 [(gogoproto.casttype) = "Ts"];
+    uint64 current_ts = 2 [(gogoproto.casttype) = "Ts", deprecated = true]; // Deprecated: Do not use this field.
     // Checkponits at each stage.
     map<string, Checkpoint> stage_checkpoints = 3 [(gogoproto.nullable) = false];
     // The barrier timestamp of the table.

cdc/scheduler/internal/v3/coordinator.go

@@ -446,7 +446,13 @@ func (c *coordinator) maybeCollectMetrics() {
 	}
 	c.lastCollectTime = now
 
+	pdTime := now
+	// only nil in unit test
+	if c.pdClock != nil {
+		pdTime = c.pdClock.CurrentTime()
+	}
+
 	c.schedulerM.CollectMetrics()
-	c.replicationM.CollectMetrics()
+	c.replicationM.CollectMetrics(pdTime)
 	c.captureM.CollectMetrics()
 }

cdc/scheduler/internal/v3/replication/replication_manager.go

@@ -769,7 +769,7 @@ func (r *Manager) logSlowTableInfo(currentPDTime time.Time) {
 }
 
 // CollectMetrics collects metrics.
-func (r *Manager) CollectMetrics() {
+func (r *Manager) CollectMetrics(currentPDTime time.Time) {
 	cf := r.changefeedID
 	tableGauge.
 		WithLabelValues(cf.Namespace, cf.ID).Set(float64(r.spans.Len()))
@@ -786,13 +786,12 @@ func (r *Manager) CollectMetrics() {
 			WithLabelValues(cf.Namespace, cf.ID).Set(float64(phyRTs))
 
 		// Slow table latency metrics.
-		phyCurrentTs := oracle.ExtractPhysical(table.Stats.CurrentTs)
 		for stage, checkpoint := range table.Stats.StageCheckpoints {
 			// Checkpoint ts
 			phyCkpTs := oracle.ExtractPhysical(checkpoint.CheckpointTs)
 			slowestTableStageCheckpointTsGaugeVec.
 				WithLabelValues(cf.Namespace, cf.ID, stage).Set(float64(phyCkpTs))
-			checkpointLag := float64(phyCurrentTs-phyCkpTs) / 1e3
+			checkpointLag := currentPDTime.Sub(oracle.GetTimeFromTS(checkpoint.CheckpointTs)).Seconds()
 			slowestTableStageCheckpointTsLagGaugeVec.
 				WithLabelValues(cf.Namespace, cf.ID, stage).Set(checkpointLag)
 			slowestTableStageCheckpointTsLagHistogramVec.
@@ -801,7 +800,7 @@ func (r *Manager) CollectMetrics() {
 			phyRTs := oracle.ExtractPhysical(checkpoint.ResolvedTs)
 			slowestTableStageResolvedTsGaugeVec.
 				WithLabelValues(cf.Namespace, cf.ID, stage).Set(float64(phyRTs))
-			resolvedTsLag := float64(phyCurrentTs-phyRTs) / 1e3
+			resolvedTsLag := currentPDTime.Sub(oracle.GetTimeFromTS(checkpoint.ResolvedTs)).Seconds()
 			slowestTableStageResolvedTsLagGaugeVec.
 				WithLabelValues(cf.Namespace, cf.ID, stage).Set(resolvedTsLag)
 			slowestTableStageResolvedTsLagHistogramVec.
@@ -812,7 +811,7 @@ func (r *Manager) CollectMetrics() {
 		phyBTs := oracle.ExtractPhysical(table.Stats.BarrierTs)
 		slowestTableStageResolvedTsGaugeVec.
 			WithLabelValues(cf.Namespace, cf.ID, stage).Set(float64(phyBTs))
-		barrierTsLag := float64(phyCurrentTs-phyBTs) / 1e3
+		barrierTsLag := currentPDTime.Sub(oracle.GetTimeFromTS(table.Stats.BarrierTs)).Seconds()
 		slowestTableStageResolvedTsLagGaugeVec.
 			WithLabelValues(cf.Namespace, cf.ID, stage).Set(barrierTsLag)
 		slowestTableStageResolvedTsLagHistogramVec.
@@ -863,8 +862,7 @@ func (r *Manager) CollectMetrics() {
 			phyCkptTs := oracle.ExtractPhysical(pullerCkpt.ResolvedTs)
 			slowestTablePullerResolvedTs.WithLabelValues(cf.Namespace, cf.ID).Set(float64(phyCkptTs))
 
-			phyCurrentTs := oracle.ExtractPhysical(table.Stats.CurrentTs)
-			lag := float64(phyCurrentTs-phyCkptTs) / 1e3
+			lag := currentPDTime.Sub(oracle.GetTimeFromTS(pullerCkpt.ResolvedTs)).Seconds()
 			slowestTablePullerResolvedTsLag.WithLabelValues(cf.Namespace, cf.ID).Set(lag)
 		}
 	}