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I have several types of rasters in my folders (ecw, png, tiff..). Not all folders i want to process contain all of the types. In my workspace i created one reader for each type, but when one type is not available, i can not launch the workspace. How can i make a reader optional so it will accept no input data?

There is a setting under workspace parameters to Ignore Failed Readers which you could set to Yes.

 

Personally I prefer to use FeatureReaders, with a logger set to the rejected port. This allows the workspace to proceed even if the reader fails. Using FeatureReaders instead of the Ignore Failed Readers parameter gives a more granular level of control. It may be that it is acceptable for some readers to fail, but if other readers fail you want the workspace to terminate

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