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Dynamic Mapping System Configuration (ArcGIS Enterprise 11.4)

moremeowbell

Hello all!

In our new deployment of ArcGIS Enterprise 11.4 we are having quite a few issues. One of the errors that we have seen in Server Manager logs pretty consistantly is a time out error for the System/DynamicMappingHost.MapServer. Has anyone had this error before? I have not seen it before and have not yet found any documentation on the error yet. Also, I am not certain what this system service does, so any insight would be appreciated!

Brief system background:

ArcGIS Enterprise 11.4
Windows OS
AWS infrastructure

Server Manager log error

dynamic mapping server.PNG

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moremeowbell

We knew we had broken services and what they were which made finding them easy. But if you are uncertain, then checking the Server Manager logs may help find any you have. I usually set the Log Filter to "Fine." It returns a lot and some of it is junk, but I've found that that specific filter shows nearly everything which can be helpful.

bernhard

Understood. Thanks for your insight, that sounds logical. Let's see if we have broken services as well...

moremeowbell

I don't know if this will answer your question neccessarily, but here is how we got the error messages to go away. We had a bunch (~1,000) map image services that were broken due to an upgrade issue with our postgres database that was housing referenced datasets. Once we stopped the broken services, the error messages stopped coming through. From what I can tell (best educated guess), the server was getting caught up on broken services and probably utilizing all resources to ping and get a response from that service. So it was utilizing resouces on a "black hole" and causing the dynamic mapping to essentially have less resources for services that were actually in use.

bernhard

Hi,

We have the same error message appearing in our logs.

We have Enterprise 11.4 (Windows Server 2019) with the ArcGIS Server Security 2025 Update 2 Patch installed that fixes BUG-000173043.

I also tried to reboot the DynamicMappingHost service but the messages appear again after a while.

I have also checked the requestids. Those vary and all appear to only occur twice in the server logs. One time with mentioned error message and the second time with a "Error exporting map Error handling service request :java.util.concurrent.TimeoutException" message.

There more then enough free shared instances available and both hosted server (load balanced) run around 60% of RAM. So I don't see any specific services or a ressource shortage as an issue.

Service time settings:

Any ideas what else could generate this error message?

David_McRitchie

That should do it. It sounds like our issue here is not what I had in mind.

If we adjust the instance pool to either have more instances, or move this to a different instance pool type (i.e dedicated to shared) do we see any difference in the issue?

Hopefully we can get to the bottom of this soon.

David

David_McRitchie

Hey Adam,

The behaviour got logged under BUG-000173043 ( ArcGIS Server's DynamicMappingHost service will fail to start after rebooting Windows Server, where requests made to services running in Shared instance pool result in 500 wait timeout errors until the DynamicMappingHost service is restarted.)

I've seen this impact a few deployments. Only on 11.4 and in cases where a database, or folder had been registered on the Server Manager.

In instances that this is observed the deployment will either need to be upgraded to 11.5 to resolve, or an automated task to restart the DynamicMappingHost service after a machine reboot to be implemented.

Configuring Portal to start before Datastore and ArcGIS Server is also listed as a workaround.

Please let me know if this behaviour is impacting you or if you have any questions or concerns on this.

David

AdamMesser1

@David_McRitchie can you provide any additional details about the "issues from Enterprise 11.3-11.4 on deployments that have custom registered folders or databases involving the shared instance pool"?

moremeowbell

Thank you for the documentation! We are getting error messages about various services, so I don't believe it is just one service that is bogging the system down.

moremeowbell

Hey David,

We have stopped and started the service through Server Manager but that has not resolved the issue. Is there another way to do a manual restart?

Thanks,

Jennifer

David_McRitchie

Hey Jennifer,

Do things work fine if we do a manual restart of the DynamicMappingHost service after your Enterprise box has fully started?

I have seen a few issues from Enterprise 11.3-11.4 on deployments that have custom registered folders or databases involving the shared instance pool. You might be seeing this.

Many thanks,

David

ryanuthoff

DynamicMappingHost is referring to services published using the shared instance type. This documentation provides some more information about it.

Now regarding your error message, it appears that one of your services is struggling. If it's a heavily used service, it might be better off as a dedicated instance. If not, then there might be some performance issues with it that you will need to resolve. If you're not sure right off which service is causing issues, what you might be able to do is look at the raw log file (the text log file on your server machine) and find that error message. Then, take the RequestID of that error and do a search for it in the entire log file and you might be able to find that original request (along with the actual service name).

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