In this article
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Overview
Use this Snap to consolidate multiple input streams into a single output document, where each input stream is displayed as a label containing the records that were received by that input view.
Note that this Snap does not complete executing until the execution of all upstream Snaps is done.
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The Gate Snap always produces an output document, regardless of how many or if no input documents are received. In some Pipeline designs, this functionality can trigger an error message stating, mapped variables are missing, during validation. This error typically occurs when a downstream Snap expects a field based off an output document from the Gate Snap that is empty. To prevent the error from occurring, you can limit empty documents output from the Gate Snap by inserting a Filter Snap after it with the following expression:
When you run the Pipeline after adding the Filter Snap with this expression, the Pipeline validates and executes successfully, and the error no longer occurs. |
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