Comment 1 for bug 1459801

I've experimented with this a bit trying to drill down to the bug. It appears to be a problem with decoding the json containing the output of the command run, which happens at /opt/stack/ansible/lib/ansible/utils/__init__.py line 547. Unfortunately I was not able to isolate what in particular is going wrong.

Running pip either without the "-I" option or with "--no-cache-dir" seems to resolve the issue. Since supplying "-I" is slowing down our run Julia and I agreed that the best way to get things in order would be to omit it.

In the medium term, I'd like to look at using ansible's pip module rather than using command to run pip.