Incorrect Join Results using AMP Engine

Hello!

I have a large workflow that combines multiple disparate data sources using an union tool. After the union, I join the union result with a date master table to get all the data on the same shipping day schedule. The workflow worked great using the original engine but after upgrading to 2020.4 and enabling the AMP engine, I am getting weird results. I've posted a sample image of the output in Tableau below.

The result should show shipping day 1 as it's all the data for the 1st of the month but as you can see it shows varying results.

Any thoughts, insight and or feedback would be greatly appreciated.

Thanks so much!

Workflow

Output

Join

Optimization

AMP Engine

AMP-Engine

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rkapoor

@jvaucher0804 what does your workflow look like.

It is common that the way the data is processed with AMP will be different to non AMP.

https://help.alteryx.com/current/designer/alteryx-engine-and-amp-main-differences

mbarone

Because AMP distributes processing to multiple threads, and then brings the data back together, it may not be in the same order as when using non-AMP. The data set that results should be the same, meaning you shouldn't be losing or gaining any records using AMP vs. non-AMP. Nor should the values of your fields be different. The order of those records, however, will be different.

Are you saying that you're losing (or gaining) records? Are the values different? Or is it just the order?

jvaucher0804

Thanks for this - helped me do some more research on this and found it was because I wasn't doing a sort after calculating a running total.

Should have done more research! Thanks anyways!

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