Delete objects in parallel when deleting auto-created volumes

pkg/s3/client.go

@@ -168,11 +168,13 @@ func (client *s3Client) removeObjects(bucketName, prefix string) error {
 }
 
 // will delete files one by one without file lock
-// FIXME Delete in parallel (if we want to delete objects at all!)
 func (client *s3Client) removeObjectsOneByOne(bucketName, prefix string) error {
+	parallelism := 16
 	objectsCh := make(chan minio.ObjectInfo, 1)
-	removeErrCh := make(chan minio.RemoveObjectError, 1)
+	guardCh := make(chan int, parallelism)
 	var listErr error
+	totalObjects := 0
+	removeErrors := 0
 
 	go func() {
 		defer close(objectsCh)
@@ -183,6 +185,7 @@ func (client *s3Client) removeObjectsOneByOne(bucketName, prefix string) error {
 				listErr = object.Err
 				return
 			}
+			totalObjects++
 			objectsCh <- object
 		}
 	}()
@@ -192,29 +195,27 @@ func (client *s3Client) removeObjectsOneByOne(bucketName, prefix string) error {
 		return listErr
 	}
 
-	go func() {
-		defer close(removeErrCh)
-
 	for object := range objectsCh {
+		guardCh <- 1
+		go func() {
 			err := client.minio.RemoveObject(client.ctx, bucketName, object.Key,
 				minio.RemoveObjectOptions{VersionID: object.VersionID})
 			if err != nil {
-				removeErrCh <- minio.RemoveObjectError{
-					ObjectName: object.Key,
-					VersionID:  object.VersionID,
-					Err:        err,
-				}
-			}
+				glog.Errorf("Failed to remove object %s, error: %s", object.Key, err)
+				removeErrors++
 			}
+			<- guardCh
 		}()
-
-	haveErrWhenRemoveObjects := false
-	for e := range removeErrCh {
-		glog.Errorf("Failed to remove object %s, error: %s", e.ObjectName, e.Err)
-		haveErrWhenRemoveObjects = true
 	}
-	if haveErrWhenRemoveObjects {
-		return fmt.Errorf("Failed to remove all objects of path %s", bucketName)
+	for i := 0; i < parallelism; i++ {
+		guardCh <- 1
+	}
+	for i := 0; i < parallelism; i++ {
+		<- guardCh
+	}
+
+	if removeErrors > 0 {
+		return fmt.Errorf("Failed to remove %v objects out of total %v of path %s", removeErrors, totalObjects, bucketName)
 	}
 
 	return nil