topic Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service) in Management & Governance

Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

BTIZAG_OA — Tue, 18 Feb 2025 11:40:34 GMT

Hello guys, im having this trouble like more than 1years.

In our environment, we have a failover node which does not have any purpose other than being a failover. So there are no task/manuel load on this server.

Somehow server is going to use all of the memory when it reached +%80 server becomes unresponsive. It happens like every month, still i dont know it happens. When the problem occurs, i login to server, i can see there are +1million handle counts on the CPU and +1million log entries on the EventViewer which are related to QlikSenseServiceDispatcher. Also with rammap i checked memory consumption, there are +1million process belong to NLAppsearch.exe (even though i disabled this process from config files).

Are there anyone who experienced something like this? I am using QS FEB 2023 release.

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

Alan_Slaughter — Tue, 18 Feb 2025 17:37:45 GMT

Hi Maybe this could be helpful to you:

https://community.qlik.com/t5/Official-Support-Articles/How-to-change-the-Qlik-Sense-Dispatcher-Service-Log-Level-or/ta-p/1942853

https://community.qlik.com/t5/Official-Support-Articles/Excess-space-consumption-by-Repository-folder-of-Qlik/ta-p/1716390

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

BTIZAG_OA — Wed, 19 Feb 2025 06:16:49 GMT

Hello Alan,

thanks for your reply but i dont have any problem with disk space, its about Memory usage somehow goes %100 and server becomes unresponsive and only thing we can do is reboot the server.

We also have a open ticket on Microsoft and their support engineer told us to disable QlikSenseService Dispatcher due to it has so many handle counts on CPU (+1m).

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

Alan_Slaughter — Wed, 19 Feb 2025 12:13:56 GMT

Hi, I recommend opening a support case.

https://community.qlik.com/t5/Support/ct-p/qlikSupport

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

BTIZAG_OA — Thu, 20 Feb 2025 07:00:38 GMT

Hello Alan,

I had a ticket on Qlik too and its closed with response increase maximum RAM of server, but its already have 64gb of ram and its enough for a failover server which waits without any load(untill promoto as a central). Neither SupportQlik nor we couldnt find root cause of this memory leak :(. Only thing we can do is reboot server everytime it happens.

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

Alan_Slaughter — Thu, 20 Feb 2025 21:15:31 GMT

Hi 64GB is not a lot of ram for a server. I have 128GB in my cellphone. Can you increase it to see if it helps?

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

BTIZAG_OA — Fri, 21 Feb 2025 06:04:02 GMT

Hello there Alan, we already have 3TB of memory for engine operations on other nodes. We have this problem only on a failovernode and it does NOT have any Engine load. How come it needs 128GB for just operating dispatcher&Repository service?

It says min req for QS is 8GB in here(64 totally seems fine for that) > https://help.qlik.com/en-US/sense-admin/November2024/Subsystems/DeployAdministerQSE/Content/Sense_DeployAdminister/Common/system-requirements.htm

I just want to know why does memory leak happens and try to figure out how we can prevent it.

Re: Qlik Sense High Memory usage on Failover Node (Related with Dispatcher service)

Alan_Slaughter — Fri, 21 Feb 2025 16:54:50 GMT

Hi maybe this will be helpful to you:

https://community.qlik.com/t5/Video-Transcripts/Troubleshooting-High-RAM-Usage-in-Qlik-Sense/ta-p/1865365

https://community.qlik.com/t5/Official-Support-Articles/Qlik-Sense-Failover-Central-node-Requirements-and-Considerations/ta-p/1713240