`cluster_cookie()` issues `UndefRefError` on `v0.7-rc2`

[raminammour]

Just noticed this:

julia> cluster_cookie()
ERROR: UndefRefError: access to undefined reference
Stacktrace:
 [1] getproperty at ./sysimg.jl:18 [inlined]
 [2] cluster_cookie() at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v0.7/Distributed/src/cluster.jl:647
 [3] top-level scope at none:0

julia> versioninfo()
Julia Version 0.7.0-rc2.0
Commit 78540cba4c (2018-08-02 19:14 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.0 (ORCJIT, sandybridge)

Cheers!

[JeffBezanson]

Out of curiosity, what is the reason for calling this directly? It can still be fixed of course.

[raminammour]

It is called by ClusterManagers to generate the random cookie. Incidentally cluster_cookie(cookie) still works, I thought I can use that as a workaround.

However, something between beta2 and rc2 broke ClusterManagers even if I run cluster_cookie("whatever") before (but that is a separate issue to take with that package that has not updated to 0.7 yet...).

Thanks for the help!

[raminammour]

Ok some advance, calling Distributed.init_multi() manually before using ClusterManagers fixes ClusterManagers. So I guess it is deeper than just cluster_cookie and prob this is prob related too #28140.

Cheers!

[JeffBezanson]

Yes, that is the cause.