[to be removed] debug logs on mpu

Author: benzekrimaha

lib/api/listParts.js

@@ -89,9 +89,19 @@ function listParts(authInfo, request, log, callback) {
     if (maxParts > constants.listingHardLimit) {
         maxParts = constants.listingHardLimit;
     }
-    // AWS SDK v3 requires partNumberMarker to be undefined (not 0) when not provided
-    const partNumberMarkerParam = Number.parseInt(request.query['part-number-marker'], 10);
-    const partNumberMarker = partNumberMarkerParam || undefined;
+
+    const partNumberMarkerQuery = request.query['part-number-marker'];
+    let partNumberMarker;
+    if (partNumberMarkerQuery !== undefined && partNumberMarkerQuery !== '') {
+        partNumberMarker = Number.parseInt(partNumberMarkerQuery, 10);
+        if (isNaN(partNumberMarker)) {
+            partNumberMarker = 0;
+        }
+    } else {
+        // When not provided or empty, use undefined for AWS backends (SDK v3 compatibility)
+        // Internal backends will handle undefined appropriately
+        partNumberMarker = undefined;
+    }
     const metadataValMPUparams = {
         authInfo,
         bucketName,