After running a few draft runs, pausing and running it again, the memory reaches 80% and I can't run anymore and I have to restart the Engine.
How to make the memory free automatically since even with no more draft runs running the memory remains at 80%
However, garbage collection is an asynchronous process and it kicks in under specific conditions when needed to provide more memory for object creation.
Please check the below article for more details.
https://community.streamsets.com/best-practice-45/notes-about-garbage-collection-108
Also, I would suggest to Change per engine Max Memory to 100%
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