when verifyNeedleIntegrity, do not truncate files

related to https://github.com/seaweedfs/seaweedfs/pull/5259

weed/storage/volume_checking.go

@@ -118,12 +118,8 @@ func verifyNeedleIntegrity(datFile backend.BackendStorageFile, v needle.Version,
 			return n.AppendAtNs, nil
 		}
 		if fileSize > fileTailOffset {
-			glog.Warningf("Truncate %s from %d bytes to %d bytes!", datFile.Name(), fileSize, fileTailOffset)
-			err = datFile.Truncate(fileTailOffset)
-			if err == nil {
-				return n.AppendAtNs, nil
-			}
-			return n.AppendAtNs, fmt.Errorf("truncate file %s: %v", datFile.Name(), err)
+			glog.Warningf("data file %s actual %d bytes expected %d bytes!", datFile.Name(), fileSize, fileTailOffset)
+			return n.AppendAtNs, fmt.Errorf("data file %s actual %d bytes expected %d bytes", datFile.Name(), fileSize, fileTailOffset)
 		}
 		glog.Warningf("data file %s has %d bytes, less than expected %d bytes!", datFile.Name(), fileSize, fileTailOffset)
 	}