# How to prevent RequestData after update pipeline?
**URL:** https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972
**Category:** Development
**Created:** [July 2, 2024, 11:16am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972 "2024-07-02T11:16:32Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@joint](https://discourse.paraview.org/u/joint)
#### Post date: [July 2, 2024, 11:16am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/1 "2024-07-02T11:16:32Z")
Hello dear Paraview developers!
I use the following pattern to get the dataset on the client side
```auto
if (filter)
{
//[WHAT FOR?]
filter->UpdatePipeline();
dataSet = vtkDataSet::SafeDownCast(vtkAlgorithm::SafeDownCast(filter->GetClientSideObject())->GetOutputDataObject(sourcePortNumber));
}
```
But I dont want the RequestData to be called by update pipeline
Could you please explain how to do it?
Thank u!
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 3, 2024, 9:32am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/2 "2024-07-03T09:32:51Z")
> I dont want the RequestData to be called by update pipeline
This is what UpdatePipeline does, why are you calling UpdatePipeline in the first place ?
---
### Author:  [@joint](https://discourse.paraview.org/u/joint)
#### Post date: [July 5, 2024, 7:17am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/3 "2024-07-05T07:17:51Z")
I have a custom filter with non-costly RequestDataObject, and very costly RequestData
I create a filter
```auto
filter = vtkSrcPrxyPtr::Take(vtkSMSourceProxy::SafeDownCast(proxyManager->NewProxy("filters", "ClientServerMoveData"))
```
And set the current proxy as the input for it.
And then call update pipeline, because otherwise it does not get any data
But I dont want the UpdatePipeline call requestData for my custom filter!
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 5, 2024, 7:26am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/4 "2024-07-05T07:26:42Z")
> [@joint](#):
>
> non-costly RequestDataObject, and very costly RequestData
RequestDataObject is not supposed to generate Data, only the DataObject. Why do you want to get only the data obect ?
---
### Author:  [@joint](https://discourse.paraview.org/u/joint)
#### Post date: [July 5, 2024, 7:48am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/5 "2024-07-05T07:48:16Z")
I could have misunderstood the concept
Could you please clarify the difference between Data and DataObject?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 5, 2024, 7:55am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/6 "2024-07-05T07:55:01Z")
DataObject → a vtkPolyDatan without any points or cells in it
Data → a vtkPolyData with cells and points in it
---
### Author:  [@joint](https://discourse.paraview.org/u/joint)
#### Post date: [July 5, 2024, 8:00am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/7 "2024-07-05T08:00:09Z")
Does DataObject contain fieldData?
When I get dataset without UpdatePipeline, but with GetCliendSideObject (i have built in mode), it seems there are no fields in the dataset
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 5, 2024, 8:04am UTC](https://discourse.paraview.org/t/how-to-prevent-requestdata-after-update-pipeline/14972/8 "2024-07-05T08:04:22Z")
After RequestDataObject, the resulting data object is expected to be fully empty.