article Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy in Official Support Articles

Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

NadiaB — Thu, 12 May 2022 13:13:40 GMT

When setting up a virtual proxy load balancing to multiple engines, it is possible to set up load balancing rules to specify which set of apps will be available on which engine(s).

In this scenario, it is desired to have all apps available in the Hub accessed through the Virtual proxy, but load balancing to directed to one node for Published Apps, and another node for Unpublished apps.

From end-user perspective, everything works fine (List App, Open App,…) until it is attempted to duplicate an application from the hub which does not work.

This will also affect ODAG applications where the Details app is Published. Error is shown "Failed to copy the app"

Environment

Resolution

Use different Proxies.

The underlying issue is that when the “Copy” of the App is being made, the copy would be unpublished, ergo the node that is making the Copy cannot see it, so the process fails.

It is suggested to use different virtual proxies instead of only one to load balance nodes for Published and Non published apps.

Internal Investigation ID(s) :

JIRA ID SHEND-631

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

msvanfeldt — Thu, 27 Jan 2022 15:37:11 GMT

Is there a solution to this problem?

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

Sonja_Bauernfeind — Thu, 27 Jan 2022 15:41:14 GMT

Hello @msvanfeldt

This is currently under investigation by RnD.

Keep an eye on the Release notes for ID SHEND-631. We do not currently have an ETA.

All the best,
Sonja

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

msvanfeldt — Thu, 27 Jan 2022 15:50:07 GMT

OK. I'm trying to set up an ODAG solution in a multinode environment. Is there a workaround for this problem?

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

Sonja_Bauernfeind — Mon, 31 Jan 2022 12:01:41 GMT

Hello @msvanfeldt

I would recommend logging a ticket to see if our Support Engineers are able to provide you with guidance on how to work around this issue.

All the best,
Sonja

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

msvanfeldt — Mon, 07 Feb 2022 14:37:05 GMT

I solved this by creating a custom property connected to Nodes and Apps.
Custom Property: ODAG
Value: YES

Then I created a load balancing Rule called ODAG:
Resource filter: App_*
Conditions: ((node.@ODAG=resource.@ODAG))

Then I configure the Nodes I want to use for ODAG and the published detailsapp with the value YES.

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

pauljohansson — Mon, 02 May 2022 14:00:12 GMT

@msvanfeldt

I don't manage with your suggestion, I still get "failed to copy the app" Is there something else you did to make it work?

thanks in advance,

Paul

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

pauljohansson — Mon, 02 May 2022 16:15:31 GMT

Hej @dpolini

Thanks for a quick reply.

1 I've created a Custom Property on the template app (ODAG="YES")

2 I've create a load balance rule ((resource.@ODAG="YES"))

My rule seems valid:

However, I still get the same problem, "failed to copy the app", when using ODAG from any of the front-end Nodes. Any idea?

Paul

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

dpolini — Tue, 03 May 2022 13:58:43 GMT

Hi @pauljohansson ,

I am sorry it didn't work but I fail to understand why it doesn't. The only thing I will say, but it's wishful thinking, is that it happened to me that rules involving custom property had a little time buffer before starting working properly.

If it keeps not working I would suggest opening a support case.

Best,

Davide

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

msvanfeldt — Thu, 09 Jun 2022 11:56:37 GMT

Here is an update of how I solved it.

The problem is that a published template-app is copied. The copy isn't published but resides in My Work. After the reload the new copy will be published again.

So my rule looks like this:

Resource filter: App_*

Conditions: ((node.@ODAG=resource.@ODAG)
and
resource.stream.Empty()
)

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

BuTbka — Mon, 11 Nov 2024 09:51:17 GMT

This it the answer on my case in support:
I'd suggest to comment on those ideas/feature request so they get more visibility.

So we can try to add visibility on this post: Make App Duplication from Hub an action irrespective of load balancing rules

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

BuTbka — Thu, 30 Jun 2022 10:07:55 GMT

Our workaround for ODAG

Balance rule:
Resource filter: App_*
Load balancing: Checked
Conditions: ((resource.name matches ".*_XXX-.*"))

*Where XXX is your domain
Because of user ODAG apps includes "_Domain" in their names

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

rafael_barioni — Fri, 01 Nov 2024 14:28:02 GMT

Still no solution?
I have 2 servers separated by stream.empty() or not, and I have exactly this problem. The idea of creating an alternative proxy for this seems poor to me, I'm thinking about alternatives, can you tell me if it's possible to do resource.createdDate? or do an auto assignment of custom properties for newly created apps?

Re: Duplication from HUB with Custom Load Balancing Rules under the same Virtual Proxy

Sonja_Bauernfeind — Mon, 11 Nov 2024 09:50:59 GMT

Hello @rafael_barioni

SHEND-631 is still being worked on and the relevant idea still open. I recommend commenting on and voting on Make App Duplication from Hub an action irrespective of load balancing rules.

You may need to first log in to the Ideation Page in order to access the link.

As for your follow-up question, please post about your requirement in the forum, where our active product experts and your knowledgeable Qlik peers are better able to assist you.

All the best,
Sonja