Code0x58 opened a new pull request #3597:
URL: https://github.com/apache/incubator-heron/pull/3597


    * replace tornado server with FastAPI+Jinja2+Uvicorn
    * factor out torado from heron.tools.common
    * add type annotations
    * expose port 8889 of Vagrant VM for heron-ui
   
   This should only be an internal refactor.
   
   Async querying of the tracker was dropped, but could be reintroduced
   using [aiohttp](https://docs.aiohttp.org/en/stable/) if speed becomes
   an issue for requests that aggregate tracker data.
   
   This will have a conflict with #3588 which I'll fix after the first merge. A 
follow on may be to add a `heron-ui` smoke test, maybe with something like 
headless chromium and grepping the logs.


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