issue 6880: set ParallelUploadAboveSize as MaxInt64

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

changelogs/unreleased/6885-Lyndon-Li

@@ -0,0 +1 @@
+Set ParallelUploadAboveSize as MaxInt64 and flush repo after setting up policy so that policy is retrieved correctly by TreeForSource

pkg/uploader/kopia/snapshot.go

@@ -68,6 +68,11 @@ func newOptionalInt(b int) *policy.OptionalInt {
 	return &ob
 }
 
+func newOptionalInt64(b int64) *policy.OptionalInt64 {
+	ob := policy.OptionalInt64(b)
+	return &ob
+}
+
 func newOptionalBool(b bool) *policy.OptionalBool {
 	ob := policy.OptionalBool(b)
 	return &ob
@@ -88,7 +93,7 @@ func getDefaultPolicy() *policy.Policy {
 		},
 		UploadPolicy: policy.UploadPolicy{
 			MaxParallelFileReads:    newOptionalInt(runtime.NumCPU()),
-			ParallelUploadAboveSize: nil,
+			ParallelUploadAboveSize: newOptionalInt64(math.MaxInt64),
 		},
 		SchedulingPolicy: policy.SchedulingPolicy{
 			Manual: true,
@@ -106,6 +111,11 @@ func setupDefaultPolicy(ctx context.Context, rep repo.RepositoryWriter, sourceIn
 		return nil, errors.Wrap(err, "error to set policy")
 	}
 
+	err = rep.Flush(ctx)
+	if err != nil {
+		return nil, errors.Wrap(err, "error to flush repo")
+	}
+
 	// retrieve policy from repo
 	policyTree, err := treeForSourceFunc(ctx, rep, sourceInfo)
 	if err != nil {