Removing duplicate features AND geometry

Without sample data or a printscreen it is hard to say what your issue is, but I often use a Matcher to find duplicate features.

sorry, here is a screenshot. The tiles do show as still there via the transparency. But they aren't actually there. These are the one showing filtered out as Duplicate.

The GeometryValidator class those features as Failed.

QGIS classes them invalid as self-intersections.

Ah, then it got probably more than 4 segments. If you select one of those in the visual preview and look at the coordinates in the Feature Information window, you will probably see why it is invalid.

But I believed those errors come from the DuplicateFilter. These features are fine before the DuplicateFilter. It looks like FME is removing duplicate features in a dirty way, it's not straightforward anyway.

Hard to say without data but I would be surprised. The DuplicateFilter does not modify features, it filters them. If you check the output of the transformers upstream of the DuplicateFilter you will find the same features.

@ts_84​ It looks like just an issue with the way you're using Visual Preview/Feature Caching. Just select If you select the transformer, data form all output ports is displayed. In the Visual Preview / Table View you'll have a drop down list of the different caches you have selected. On the Display Control icon, you can toggle on the Display Contol panel and select which caches to view

OR

If you just select the green icon on the Unique port, only those cached features will be displayed. In the Visual Preview / Table View you'll

So I think the issue is due to me using the Feature Merger in a bad way before the DuplicateFilter. Those 3 GeometryValidator show where the error happens.

Maybe I should use the Matcher instead.

Thanks everyone for their time and answers