What is the problem?

Ray segfaults if pyarrow has been imported before Ray.

In repl:

In [1]: import pyarrow

In [2]: import ray
Segmentation fault

In [1]: import ray

In [2]: import pyarrow

In [3]:

Version information:

• Python 3.7.5
• Ubuntu 19.10
• ray 0.8.2 (confirmed on nightly wheel, 0.8.1 and 0.8.0)
• pyarrow 0.16.0

Reproduction

The following should segfault:

import pyarrow
import ray

The following should not:

import ray
import pyarrow

• I have verified my script runs in a clean environment and reproduces the issue.
• I have verified the issue also occurs with the latest wheels.