1 files changed, 112 insertions, 0 deletions
diff --git a/weed/worker/tasks/vacuum/detection.go b/weed/worker/tasks/vacuum/detection.go
new file mode 100644
index 000000000..7b5a1baf0
--- /dev/null
+++ b/weed/worker/tasks/vacuum/detection.go
@@ -0,0 +1,112 @@
+package vacuum
+
+import (
+	"time"
+
+	"github.com/seaweedfs/seaweedfs/weed/glog"
+	"github.com/seaweedfs/seaweedfs/weed/worker/tasks/base"
+	"github.com/seaweedfs/seaweedfs/weed/worker/types"
+)
+
+// Detection implements the detection logic for vacuum tasks
+func Detection(metrics []*types.VolumeHealthMetrics, clusterInfo *types.ClusterInfo, config base.TaskConfig) ([]*types.TaskDetectionResult, error) {
+	if !config.IsEnabled() {
+		return nil, nil
+	}
+
+	vacuumConfig := config.(*Config)
+	var results []*types.TaskDetectionResult
+	minVolumeAge := time.Duration(vacuumConfig.MinVolumeAgeSeconds) * time.Second
+
+	debugCount := 0
+	skippedDueToGarbage := 0
+	skippedDueToAge := 0
+
+	for _, metric := range metrics {
+		// Check if volume needs vacuum
+		if metric.GarbageRatio >= vacuumConfig.GarbageThreshold && metric.Age >= minVolumeAge {
+			priority := types.TaskPriorityNormal
+			if metric.GarbageRatio > 0.6 {
+				priority = types.TaskPriorityHigh
+			}
+
+			result := &types.TaskDetectionResult{
+				TaskType:   types.TaskTypeVacuum,
+				VolumeID:   metric.VolumeID,
+				Server:     metric.Server,
+				Collection: metric.Collection,
+				Priority:   priority,
+				Reason:     "Volume has excessive garbage requiring vacuum",
+				ScheduleAt: time.Now(),
+			}
+			results = append(results, result)
+		} else {
+			// Debug why volume was not selected
+			if debugCount < 5 { // Limit debug output to first 5 volumes
+				if metric.GarbageRatio < vacuumConfig.GarbageThreshold {
+					skippedDueToGarbage++
+				}
+				if metric.Age < minVolumeAge {
+					skippedDueToAge++
+				}
+			}
+			debugCount++
+		}
+	}
+
+	// Log debug summary if no tasks were created
+	if len(results) == 0 && len(metrics) > 0 {
+		totalVolumes := len(metrics)
+		glog.Infof("VACUUM: No tasks created for %d volumes. Threshold=%.2f%%, MinAge=%s. Skipped: %d (garbage<threshold), %d (age<minimum)",
+			totalVolumes, vacuumConfig.GarbageThreshold*100, minVolumeAge, skippedDueToGarbage, skippedDueToAge)
+
+		// Show details for first few volumes
+		for i, metric := range metrics {
+			if i >= 3 { // Limit to first 3 volumes
+				break
+			}
+			glog.Infof("VACUUM: Volume %d: garbage=%.2f%% (need ≥%.2f%%), age=%s (need ≥%s)",
+				metric.VolumeID, metric.GarbageRatio*100, vacuumConfig.GarbageThreshold*100,
+				metric.Age.Truncate(time.Minute), minVolumeAge.Truncate(time.Minute))
+		}
+	}
+
+	return results, nil
+}
+
+// Scheduling implements the scheduling logic for vacuum tasks
+func Scheduling(task *types.Task, runningTasks []*types.Task, availableWorkers []*types.Worker, config base.TaskConfig) bool {
+	vacuumConfig := config.(*Config)
+
+	// Count running vacuum tasks
+	runningVacuumCount := 0
+	for _, runningTask := range runningTasks {
+		if runningTask.Type == types.TaskTypeVacuum {
+			runningVacuumCount++
+		}
+	}
+
+	// Check concurrency limit
+	if runningVacuumCount >= vacuumConfig.MaxConcurrent {
+		return false
+	}
+
+	// Check for available workers with vacuum capability
+	for _, worker := range availableWorkers {
+		if worker.CurrentLoad < worker.MaxConcurrent {
+			for _, capability := range worker.Capabilities {
+				if capability == types.TaskTypeVacuum {
+					return true
+				}
+			}
+		}
+	}
+
+	return false
+}
+
+// CreateTask creates a new vacuum task instance
+func CreateTask(params types.TaskParams) (types.TaskInterface, error) {
+	// Create and return the vacuum task using existing Task type
+	return NewTask(params.Server, params.VolumeID), nil
+}