topic Re: Not able to duplicate own apps with Load Balancing in Management & Governance

Not able to duplicate own apps with Load Balancing

jan_lance — Sat, 16 Nov 2024 01:27:04 GMT

Hi Folks,

we have a problem in a clustered enviroment:

Users are not able to duplicate their own apps in the hub in their own workspace.
They get this error:

The cluster is with a central node and 2 rim nodes (PRD and DEV).
All node purposes are on "both".
The virtual proxy of the central node has the rim node engines for load balancing.

All published Apps should be run on the PRD node and unpublished apps should be run on the DEV node.
The Load Balancing rules are as follows:

Load Balancing Rules

Qlik Support told me this:

1. The engine used to duplicate the app doesn't have "permissions" to create the app in "my work"
2. When you try to duplicate the app in the stream, it will use the engine on the PROD node, but that engine is not able to create the app in "My work" as per LB rules
3. Only the engine on DEV node is allowed to do that with those LB rules
4. You can create an app because create an app will use the engine on the DEV node.
5. When you duplicate, it can only use 1 engine to do the whole process, and the PROD engine doesn't have rights to create apps in my work

So, ok now I know what is causing the problem but I still do not have a solution.
Unfortunately they could not help me further, so I am trying my luck here 🙂

Does anybody have an idea?

Re: Not able to duplicate own apps with Load Balancing

Levi_Turner — Mon, 21 Sep 2020 12:28:56 GMT

Unfortunately you're encountering a deep issue in the way the Hub is rendered (bullet 5 is key here, one Engine does the duplicate thus it needs to be able to see the app and be able to create apps).

The work-around would be to duplicate in the QMC.

Re: Not able to duplicate own apps with Load Balancing

danielrozental_itm — Wed, 25 Nov 2020 12:25:33 GMT

Hi Jan, were you able to find a solution or a workaround?

Re: Not able to duplicate own apps with Load Balancing

mehmet_gencsoy — Mon, 14 Dec 2020 16:45:11 GMT

@Levi_Turner

@jan_lance

Is there any workaround possible?? We have the same issue.

Re: Not able to duplicate own apps with Load Balancing

Levi_Turner — Mon, 14 Dec 2020 16:57:41 GMT

@mehmet_gencsoy : As I mentioned, above, the work-around is to duplicate from the QMC.

Re: Not able to duplicate own apps with Load Balancing

mehmet_gencsoy — Mon, 14 Dec 2020 17:38:13 GMT

@Levi_Turner : Is there no way to duplicate from hub?? No way to extend the LB rules to get this work without error messages from hub?

Re: Not able to duplicate own apps with Load Balancing

Levi_Turner — Tue, 15 Dec 2020 14:25:37 GMT

The way the product is currently designed:

- An Engine delivers the Hub, aka the list of apps

- That Engine needs to have the app load balanced for the duplicate action to work

- Which Engine is selected is determined by a round robin algorithm

The combination of these is that there's not a way to have a reliable duplicate action from the Hub and use Load Balancing rules with any sophistication.

I'd suggest logging a feature request on the Ideas section of Community for this much needed improvement: https://community.qlik.com/t5/Ideas/idb-p/qlik-ideas

Re: Not able to duplicate own apps with Load Balancing

jan_lance — Tue, 15 Dec 2020 18:42:59 GMT

@danielrozental_itm @mehmet_gencsoy

Actually I DID find a workaround.

I just switched my Rim Nodes.

I just renamed PRD to DEV and DEV to PRD.

Turns out QlikSense always uses the first engine to duplicate the app.
The more you know...

Now the first engine is my DEV node and it works!

Re: Not able to duplicate own apps with Load Balancing

danielrozental_itm — Tue, 15 Dec 2020 18:44:53 GMT

Good to know, thanks for your reply Jan.

Re: Not able to duplicate own apps with Load Balancing

mehmet_gencsoy — Tue, 15 Dec 2020 19:50:13 GMT

Sorry that did not work for me. I have also renamed the nodes, but it did not help.

I have also problems with publishing apps. Do you have solved that issue also?

Which version are you using? Maybe it is an issue with our version. And do you have more details about your setup (virtual proxy, load balancing rules, etc.).

Thanks a lot.

Re: Not able to duplicate own apps with Load Balancing

santhoshkumar — Fri, 18 Dec 2020 10:41:26 GMT

i too have this issue.

when you enable the rule ResourcesOnNonCentralNodes you can duplicate the apps but the load balancing will not work.

received recommendation from qlik that we should have different URLs for load balancing to work. I am yet to see any documents around this.

If you come across any useful information, please do share?

Re: Not able to duplicate own apps with Load Balancing

slh2QlikUser — Fri, 30 Apr 2021 19:27:01 GMT

Same oh my goodness I just stumble upon this thread and this explains a lot of the headaches i've gone through for past few weeks.

Re: Not able to duplicate own apps with Load Balancing

pablodelcerro — Fri, 24 Sep 2021 02:01:48 GMT

Hi Jan,

So right now your DEV node can open every app on the cluster, right? Thats why you are able to duplicate the app.

We are facing the same issue but on a 5 nodes cluster, and if we set 1 node to open every app that node will probably crash, so not sure how to adapt your workarround.

Any ideas?

Re: Not able to duplicate own apps with Load Balancing

Iqbal_Khan — Thu, 07 Apr 2022 10:30:25 GMT

@Levi_Turner : Is there any fix available in latest version of Qlik? We are using Feb 2021 Patch 4 and getting same error "unable to duplicate app" for any published app.

Re: Not able to duplicate own apps with Load Balancing

mgranillo — Mon, 10 Oct 2022 20:22:55 GMT

@Levi_Turner you say : "- An Engine delivers the Hub, aka the list of apps"

Does Qlik round-robin through the engines to deliver the hub so it's unpredictable if the duplication will work or not?

My situation is a little different. I just have an nprinting node and a node for everything else so duplicating an app from prod to a workstream should all have same permissions, yet I still get the duplication error.