Poetry 1.4.0 can't install dependencies: Connection pool is full

[borice]

With the upgrade to Poetry 1.4.0 I am now getting the following error when running poetry install in CircleCI.

Connection pool is full, discarding connection: pypi.org. Connection pool size: 10

I have changed the build script to install Poetry 1.3.2, and the error went away.
I have checked that going back to 1.4.0 brings back the error also.

It seems that whatever changed between 1.3.2 and 1.4.0 is now causing this error for us in CircleCI.

[dimbleby]

that's just a benign warning. You haven't said what your problem is, but I don't think it's this.

[borice]

Well, this is what I was seeing in CircleCI:

... but after reverting to 1.3.2 and restarting the build, I ran into this other error in the Docker image building step (which also used Poetry 1.4.0):

I reverted that setup to use 1.3.2 also, and error was gone. Went back to 1.4.0 briefly to test if this was a sporadic error, and error came back. Back again to 1.3.2 error went away again. So 1.4.0 seems to have some regression issue.

[dimbleby]

duplicate #7572, please close

[allanlewis]

I don't think this is related to #7572, it's the issue reported in this SO post. The solution suggested there, which works for me, is to set the Poetry config setting installer.max-workers to 10.

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