ttl: optimize ttl

Author: lcwangchao

pkg/timer/runtime/runtime.go

@@ -19,6 +19,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"maps"
+	"slices"
 	"sync"
 	"time"
 
@@ -252,9 +253,7 @@ func (rt *TimerGroupRuntime) fullRefreshTimers() {
 
 func (rt *TimerGroupRuntime) tryTriggerTimerEvents() {
 	now := rt.nowFunc()
-	var retryTimerIDs []string
-	var retryTimerKeys []string
-	var busyWorkers map[string]struct{}
+	var readyTimers []*timerCacheItem
 	rt.cache.iterTryTriggerTimers(func(timer *api.TimerRecord, tryTriggerTime time.Time, nextEventTime *time.Time) bool {
 		if tryTriggerTime.After(now) {
 			return false
@@ -264,9 +263,45 @@ func (rt *TimerGroupRuntime) tryTriggerTimerEvents() {
 			return true
 		}
 
+		if readyTimers == nil {
+			readyTimers = make([]*timerCacheItem, 0, 8)
+		}
+
+		readyTimers = append(readyTimers, &timerCacheItem{
+			timer:         timer,
+			nextEventTime: nextEventTime,
+		})
+		return true
+	})
+
+	if len(readyTimers) == 0 {
+		return
+	}
+
+	// resort timer to make sure the timer has the smallest nextEventTime has a higher priority to trigger
+	slices.SortFunc(readyTimers, func(a, b *timerCacheItem) int {
+		if a.nextEventTime == nil || b.nextEventTime == nil {
+			if a.nextEventTime != nil {
+				return 1
+			}
+
+			if b.nextEventTime != nil {
+				return -1
+			}
+
+			return 0
+		}
+		return a.nextEventTime.Compare(*b.nextEventTime)
+	})
+
+	var retryTimerIDs []string
+	var retryTimerKeys []string
+	var busyWorkers map[string]struct{}
+	for i, item := range readyTimers {
+		timer := item.timer
 		worker, ok := rt.ensureWorker(timer.HookClass)
 		if !ok {
-			return true
+			continue
 		}
 
 		eventID := timer.EventID
@@ -284,20 +319,22 @@ func (rt *TimerGroupRuntime) tryTriggerTimerEvents() {
 
 		select {
 		case <-rt.ctx.Done():
-			return false
+			return
 		case worker.ch <- req:
 			rt.cache.setTimerProcStatus(timer.ID, procTriggering, eventID)
 		default:
 			if busyWorkers == nil {
-				busyWorkers = make(map[string]struct{})
+				busySize := len(readyTimers) - i
+				retryTimerIDs = make([]string, 0, busySize)
+				retryTimerKeys = make([]string, 0, busySize)
+				busyWorkers = make(map[string]struct{}, busySize)
 			}
 
 			busyWorkers[timer.HookClass] = struct{}{}
 			retryTimerIDs = append(retryTimerIDs, timer.ID)
 			retryTimerKeys = append(retryTimerKeys, fmt.Sprintf("[%s] %s", timer.Namespace, timer.Key))
 		}
-		return true
-	})
+	}
 
 	if len(retryTimerIDs) > 0 {
 		busyWorkerList := make([]string, 0, len(busyWorkers))