No Sandbox Worker processes are currently available
All articles from this blog can ONLY be redistributed on an Attribution-NonCommercial-NoDerivs basis. Please credit the source, thank you.
Blog：Kelvin Shen's Blog
Our tester reported the following error logged in a Dynamics 365 online instance multiple times and it is a blocker. The Dynamics 365 instance consists of a Sales module and a PSA module.
Error: The plug-in execution failed because no Sandbox Worker processes are currently available.
Dynamics Sandbox Understanding (The Mechanism)
VarunReddyParam has an excellent write up on the topic. Therefore I am not going to repeat it here. In summary, partially trusted work load in Dynamics 365 follows two flows below.
w3wp > sandbox host > sandbox worker
CrmAsyncService > sandbox host > sandbox worker
- Microsoft platform issues. The host of my Dynamics 365 ran out of worker processes.
- w3wp put too much load on the sandbox host.
- CrmAsyncService puts too much load on the sandbox host.
I looked through all workflow system jobs. There were failed ones but none of them has the “no Sandbox Worker processes” error.
I didn’t have enought information to pin point the issue. So, I will need some Microsft help because only they can see see lower level errors and logs.
Microsoft Customer Support Service
I was hoping Microsoft CSS can
- Narrow down if it is a platform issue or a customization issue.
- If it is a customization issue, they could pin point which workflow or plugin was the culprit.
So a premium support ticket with an escalation to level A later, Microsoft recommended us to review our plugin code.
The Key Takeaways
There are three takeaways. Performance, performance, and performance.
Review your plugin where:
- Plugins trigger on all entities.
- Plugins trigger on all attributes.
- Plugins code retrieves ALL fields.
- Plugins takes too long to execute. For example, plugins process/validate/generate/upload files. Maybe convert it into an asynchronous workflow?
Fixing issues retrospetively is expensive. You should do the right thing in the first place.