fix(ec): volumes created by foreign collection due to bug in ec balance (#4864)

* fix(ec): ignore 0 byte data files

refers to parts of #4861

Signed-off-by: Tobias Gurtzick <magic@wizardtales.com>

* fix(ec): ignore volumes not from the current collection during balance

fixes #4861

Signed-off-by: Tobias Gurtzick <magic@wizardtales.com>

---------

Signed-off-by: Tobias Gurtzick <magic@wizardtales.com>

weed/storage/disk_location_ec.go

@@ -2,13 +2,14 @@ package storage
 
 import (
 	"fmt"
-	"golang.org/x/exp/slices"
 	"os"
 	"path"
 	"regexp"
 	"strconv"
 	"strings"
 
+	"golang.org/x/exp/slices"
+
 	"github.com/seaweedfs/seaweedfs/weed/storage/erasure_coding"
 	"github.com/seaweedfs/seaweedfs/weed/storage/needle"
 )
@@ -163,7 +164,15 @@ func (l *DiskLocation) loadAllEcShards() (err error) {
 			continue
 		}
 
-		if re.MatchString(ext) {
+		info, err := fileInfo.Info()
+
+		if err != nil {
+			continue
+		}
+
+		// 0 byte files should be only appearing erroneously for ec data files
+		// so we ignore them
+		if re.MatchString(ext) && info.Size() > 0 {
 			if prevVolumeId == 0 || volumeId == prevVolumeId {
 				sameVolumeShards = append(sameVolumeShards, fileInfo.Name())
 			} else {