Multiple notebooks installing packages in parallel can break

[fonsp]

I've seen it happen once 👀

[shashankp]

I guess notebook on the right is worker 3

[Moelf]

https://github.com/simonbyrne/PkgLock.jl
https://discourse.julialang.org/t/distributed-packages-and-race-condition-in-pre-compiling/43340
I guess this is what it is with Distributed.jl, not something we can fix here in Pluto.

Maybe advise user to use PkgLock at the mean time if they have multi-user situation. (much like HPC use-case, where this error is reported the most)

[fonsp]

It caused this error on windows:

SystemError: opening file "C:\Users\fonsv\.julia\registries\General\Registry.toml": No such file or directory

[fonsp]

not something we can fix here in Pluto.

I disagree, we can and should fix it inside Pluto

[fonsp]

JuliaLang/Pkg.jl#2219

[fonsp]

Solved if you use #844

[fonsp]

This has been solved by Pluto's built-in package manager, which uses a global lock to ensure that only one notebook's package environment is being processed at the same time, all other notebook evaluation happens in parallel.

This can still be an issue when you run multiple notebooks in parallel which set up their own package environment using Pkg.activate.