fix: use getPoolIdx in DeleteObjects() (#11513)

filter out relevant objects for each pool to
avoid calling, further delete operations on
subsequent pools where some of these objects
might not exist.

This is mainly useful to avoid situations
during bi-directional bucket replication.

cmd/erasure-server-pool.go

@@ -639,6 +639,23 @@ func (z *erasureServerPools) DeleteObjects(ctx context.Context, bucket string, o
 		objSets.Add(objects[i].ObjectName)
 	}
 
+	poolObjIdxMap := map[int][]ObjectToDelete{}
+	origIndexMap := map[int][]int{}
+	if !z.SinglePool() {
+		for j, obj := range objects {
+			idx, err := z.getPoolIdx(ctx, bucket, obj.ObjectName, 1<<30)
+			if err != nil {
+				// Unhandled errors return right here.
+				for i := range derrs {
+					derrs[i] = err
+				}
+				return dobjects, derrs
+			}
+			poolObjIdxMap[idx] = append(poolObjIdxMap[idx], obj)
+			origIndexMap[idx] = append(origIndexMap[idx], j)
+		}
+	}
+
 	// Acquire a bulk write lock across 'objects'
 	multiDeleteLock := z.NewNSLock(bucket, objSets.ToSlice()...)
 	if err := multiDeleteLock.GetLock(ctx, globalOperationTimeout); err != nil {
@@ -653,13 +670,15 @@ func (z *erasureServerPools) DeleteObjects(ctx context.Context, bucket string, o
 		return z.serverPools[0].DeleteObjects(ctx, bucket, objects, opts)
 	}
 
-	for _, pool := range z.serverPools {
-		deletedObjects, errs := pool.DeleteObjects(ctx, bucket, objects, opts)
+	for idx, pool := range z.serverPools {
+		objs := poolObjIdxMap[idx]
+		orgIndexes := origIndexMap[idx]
+		deletedObjects, errs := pool.DeleteObjects(ctx, bucket, objs, opts)
 		for i, derr := range errs {
 			if derr != nil {
-				derrs[i] = derr
+				derrs[orgIndexes[i]] = derr
 			}
-			dobjects[i] = deletedObjects[i]
+			dobjects[orgIndexes[i]] = deletedObjects[i]
 		}
 	}
 	return dobjects, derrs