This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 92%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAB%3C/text%3E%3C/svg%3E)
Hi guys, right now we are testing a durable functions thats use Fan out/fan in pattern. Everything is working well but when we try to scale the level of parallelism we get this message:
"Delaying work item fetching because the current active work-item count exceeds the configured maximum active work-item count (20)"
We try to fix it setting this Application setting : WEBSITE_MAX_DYNAMIC_APPLICATION_SCALE_OUT = 200
And this scale out parameter: Maximum Scale Out Limit : 200
So guys, if you know the way to get the behavior we are looking for, will be nice if you could guide us.
Thanks for your help.
@Alejandro Benitez Aragon The error that you are observing are at the host level (per instance) and are concurrency throttles that can be configured in host.json depending on your scenario.
Thanks a lot.
Your answer has allowed me to move forward. Taking advantage of your knowledge, I want to ask:
Thx again.
@Alejandro Benitez Aragon It would depend on the load your function app is under. Under no load, the same instance will run everything but as your function app scales out, activity functions could be picked up by any instance (from an internal queue).
The Performance and Scale should be give you a detailed overview of how durable functions handles this.