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ipyparallel broken for tornado 4.5.3 ("RuntimeError: IOLoop is already running") #334

@basnijholt

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@basnijholt

I need to use tornado 4.5.3 because of this issue jupyter/notebook#3397

I tried to connect to an ipycluster and get the following error:

"RuntimeError: IOLoop is already running"

This problem was introduced quite recently because it was not present in 6.1.1.

Actually, I also tried installing ipython/ipykernel#323 and ipython/ipython#11155 with the new tornado, that that didn't help.

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