OperationalError: (2006, 'MySQL server has gone away (Stream is closed)') about tornado-mysql HOT 4 CLOSED

I suppose you closed connection twice.
But I can't confirm since your code is not reproducible code.
No one but you can investigate your problem is caused by Tornado-MySQL or your code.

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I think the issue is with Tornado-MySQL because the lines I've written, these are the only lines of code that are being executed and throwing this error. The error is thrown when it executes conn.close() .

In my code, I don't see the connection being closed at any point other then the last line.
Can you try to replicate this issue? I think to do so, all you have to do is change the db='camera' (with your database name) line and complete the insert query I've left half written.

I tried to check Tornado-MySQL code, and I couldn't find any point where the connection is closed. I don't know if making the connection async is making the connection go away or there is an issue with my code (which I really doubt so) or the issue is with Tornado-MySQL.

from tornado-mysql.

I think to do so, all you have to do is change the db='camera' (with your database name) line

OK, but...

and complete the insert query I've left half written.

Why don't you do?

And there is need to make your code to valid Tornado application.
I don't use tornado for a long time.
I need to read doc to know how to run coroutine in simple script.

Additionally, if I can't reproduce, I waste my energy and time.

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I can't reproduce it with this script.
https://gist.github.com/methane/068a269fc804fa2e39a53be3c55e275a

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