[Core] ray stop does not clean up ray_current_cluster file

[m-harmonic]

What happened + What you expected to happen

1. Start a cluster from the command line without a .yaml file:

ray start --head --port=6379 --temp-dir=/tmp/ray

2. Stop Ray processes manually

ray stop

3. The cluster file (ray_current_cluster) is still there and has not been cleaned up.

The problem is that starting ray again after this using ray.init() will fail because it sees the existing cluster file and tries to connect to that cluster instead of starting a new local one. Passing address="local" fixes the problem, however.

Versions / Dependencies

Ray: 2.9.3
Python: 3.10.12
OS: Ubuntu 20.04.6 LTS

Reproduction script

ray start --head --port=6379 --temp-dir=/tmp/ray
ray stop
ls /tmp/ray/ray_current_cluster

Issue Severity

Medium: It is a significant difficulty but I can work around it.

[MaxVanDijck]

Try updating your version of ray, I suspect this is the same issue that was fixed in #27666
issue: #27021

[jjyao]

Hi @m-harmonic, could you try the latest Ray. I think the issue is fixed.