CI: Restore pyarrow for travis-3.6 #26716
Description
Present in the last two builds on master
- https://travis-ci.org/pandas-dev/pandas/jobs/542915088
- https://travis-ci.org/pandas-dev/pandas/jobs/542931830
gw0 I /home/travis/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/hypothesis/_settings.py:193: HypothesisDeprecationWarning: The timeout setting can safely be removed with no effect. verbosity=self.verbosity, [gw0] node down: Not properly terminated Replacing crashed worker gw0 Something is crashing our pytest-xdist worker. We used pytest-xdist 1.28.0 in the last green build https://travis-ci.org/pandas-dev/pandas/jobs/542868383, so it's likely not pytest-xdist itself.
Edit: Seems to be an issue with feather / pyarrow. We segfault when collecting tests: https://travis-ci.org/pandas-dev/pandas/jobs/542977519#L3052. #26715 is skipping, use this issue to restore.
collecting 34877 items / 1 skipped / 34876 selected Fatal Python error: Segmentation fault Current thread 0x00007fb9015dd740 (most recent call first): File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed File "<frozen importlib._bootstrap_external>", line 922 in create_module File "<frozen importlib._bootstrap>", line 571 in module_from_spec File "<frozen importlib._bootstrap>", line 658 in _load_unlocked File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 971 in _find_and_load File "/home/travis/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/pyarrow/__init__.py", line 47 in <module> File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed File "<frozen importlib._bootstrap_external>", line 678 in exec_module File "<frozen importlib._bootstrap>", line 665 in _load_unlocked File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 971 in _find_and_load File "/home/travis/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/_pytest/outcomes.py", line 168 in importorskip File "/home/travis/build/pandas-dev/pandas/pandas/tests/io/test_feather.py", line 13 in <module> File "/home/travis/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/_pytest/assertion/rewrite.py", line 304 in load_module File "<frozen importlib._bootstrap>", line 626 in _load_backward_compatible File "<frozen importlib._bootstrap>", line 656 in _load_unlocked File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 971 in _find_and_load File "/home/travis/miniconda3/envs/pandas-dev/lib/python3.6/site-packages/py/_path/local.py", line 701 in pyimport