This is a new feature, let me make a brief introduction.

Normally, we execute the whole workflow from start to the end. But sometimes, 
we want to pause the workflow to check the intermediate result. If correct, 
execution process continue. If not, pause the workflow and inform someone to 
solve it. So, I propose blocking task. The aim of blocking task is to pause the 
execution process properly based on user settings. Now, I come up with two 
solutions:
Solution I: Modify current node to support this feature.
Solution II: Add a new type of node.

I want to know which solution is more appropriate. If you interested in this 
feature, you can follow this link to learn more about blocking task and my 
solutions.

Best Regards

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Stay Hungry, Stay Foolish
Martin Huang
[email protected]
Sent with a Spark
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