ASPxUploadControl - Advanced Mode - support web farms, web gardens

Thx

I was wondering, if having a shared temporary folder called from all the webservers would solve this issue.
So web1,web2,web3,web4 all would point to //web4/tempfolder ?

Hello,
We have not tested such scenario yet, so we cannot say whether this will work properly.
We will update this report once any news regarding this subject is available.

Any word yet on this possible scenario to solve the web farm issue?

Hello Rick,
We have tested this solution. The current ASPxUploadControl design does not allow for the implementation of such scenario. We plan to implement this feature in the next major version of our controls. Until that, the only universal solution is to use ASPxUploadContorl in Standard upload mode without using Progress bar can be used in Web Farm applications.

I had the control set to standard, but I also had ShowProgressPanel="True". Here is the markup.
 <dx:ASPxUploadControl ID="UploadControl" runat="server" ClientInstanceName="UploadControl"
                                      ShowProgressPanel="True" ShowUploadButton="True" UploadMode="Standard" OnFilesUploadComplete="UploadControl_FileUploadsComplete"
                                      Width="280px" FileUploadMode="OnPageLoad">
                    <ValidationSettings ShowErrors="False">
                    </ValidationSettings>
                    <UploadButton Text="Upload Receipts">
                    </UploadButton>
                    <AdvancedModeSettings EnableMultiSelect="True"/>
                    <ClientSideEvents FilesUploadComplete="function(s, e) { UploadControl_OnFilesUploadComplete(e); }" ></ClientSideEvents>
                </dx:ASPxUploadControl>

Hello Rick,
I see that you have enabled the EnableMultiSelect setting. Please note that if you use any Advanced Upload mode feature, the Advanced Upload mode is automatically enabled regardless the UploadMode setting. Advanced mode features do not operate in Standard mode. So, we decided to automatically enable the Advanced mode if one of its features is enabled.
As for the Progress bar, ASPxUploadControl would not operate in Web Farm environment if its progress bar is enabled. The control sends additional requests to the server side to get upload progress information. When using the Progress Bar, the requests will be handled by different servers (due to Web Load Balancer) while a file is being uploaded to some certain server. Therefore, ASPxUploadControl won't operate correctly in a Web Farm application if the Progress Bar is enabled.

So let me see if I understand this.
For the control to operate properly in a webfarm
a) UploadMode="Standard"
b) <AdvancedModeSettings EnableMultiSelect="False"/>
c) ShowProgressPanel="False"
Otherwise UploadMode is automatically set to Advanced, and the "corrupt file beacause of a webfarm" ssuue could occur?

Not exactly. All these settings are disabled by default. Just make sure that none of them remain (or other Advanced mode settings). This means that the control operates in the Standard mode. On the other hand, you can manually set Advanced mode settings to the disabled state.

It has been four years since this issue was originally raised. Is this something which you are still planning to implement?

Hello Simon,

Yes, we plan to implement this feature. I am not sure about the next version v15.1, but we clearly see that this feature becomes more and more sought after. I think that we will try to implement it in version v15.2.

Hi Vladimir,
The features I am particularly interested in are multi-file selection, file list and drag and drop. I would like to be able to use these features in standard mode. Not sure why they need the advanced mode file chunking for what are UI features.

Hello Simon,

I am not sure that we can support such features in Standard mode since they require HTML 5 support. Old browsers such as IE7 and IE8 do not have the required functionality. Nevertheless, I will notify our guys of this requirement. It is possible that we will find the way.

Hi,
Could you please confirm that this functionality (Advanced mode uploads in Web Farms - specifically in a Cloud Service with multiple Web instances in Azure) will be implemented in v15.2?  I'm currently evaluating other component sets that do have this functionality (as this is a huge requirement and I'm currently stuck on v14.1.7 where this does work) but I would much prefer to keep with DevExpress if it's possible.  I'd even be happy with just being able to switch off the security changes you did in v14.1.8 which broke this functionality in the first place as we don't need the security changes (as our website is private)…  Perhaps a web.config setting could be added to disable the security changes?
Please advise

Hi,

I can't guarantee that we will implement this feature in 15.2. While we don't have any ETA on this feature, I recommend you add this ticket to your favorites to be notified about our progress. As for the disabling the security changes, it's also not possible. You can use the 14.1.7 version if you need it, but I don't recommend it.

Hi,
Specify please whether there is a progress in supports of web garden?