[FEATURE] Flow.update() / Flow.update_async() automatically batch redundant requests #720
Description
We'll upgrade our update_async() API so that it will automatically wait / batch multiple update requests. For example:
- If there's already an ongoing update, we'll delay this update request until the previous one done.
- If multiple update requests arrive before one ongoing update done, we'll deduplicate/batch these requests: only one need to be triggered after the previous one done.
Basically users can simply call update_async() API whenever there's a change, and we schedule the update in the optimized way.
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