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Since you know that it could work with less data an with the standard engine, I would contact Alteryx Support Team (firstname.lastname@example.org) to confirm the behaviour. You might have reached a limitation of AMP.
I also start having this error occasionally. Seems it could be a question of available ressources:
1. Workflow A ran successfully through Scheduler with AMP engine while machine was not running other workflows
2. Workflow A failed when running manually with AMP engine on same machine while another large workflow B was running
3. Workflow A ran successfully manually without AMP engine while the same large workflow B was running
I think at least we need the workflow to fail with this error message. Yesterday I left a workflow with AMP engine run all night (no other workflows on the machine running). Usually it takes around two hours. I stopped this one after 16 hours with no output generated.
Bumped into this today. Unexpectedly, even after I stopped the workflow and closed Alteryx Designer, the temp files the workflow had written to my Temporary Directory remained. So this reply is just a public service announcement that some manual cleanup might be required when encountering this error.
I just got this error too. Again, a very large workflow/output (5GB Tableau hyper extract).
The workflow created my hyper file, then I was testing the tool to publish to Tableau and this appears to be where the error occurred. It's been running over 16 hours and only 40% done. I know I can publish this extract in <1 hr from Tableau.
I will try turning off AMP to see if that resolves this. If so, I hope Alteryx can figure it out as AMP mode is definitely saving me lots of time on this workflow.