viirya commented on a change in pull request #23904: [SPARK-27000][PYTHON]
Upgrades cloudpickle to v0.8.0
URL: https://github.com/apache/spark/pull/23904#discussion_r260829270
##########
File path: python/pyspark/tests/test_rdd.py
##########
@@ -726,6 +729,13 @@ def stopit(*x):
self.assertRaisesRegexp((Py4JJavaError, RuntimeError), msg,
seq_rdd.aggregate, 0, lambda *x: 1, stopit)
+ def test_overwritten_global_func(self):
+ # Regression test for SPARK-27000
+ global global_func
+ self.assertEqual(self.sc.parallelize([1]).map(lambda _:
global_func()).first(), "Hi")
+ global_func = lambda: "Yeah"
+ self.assertEqual(self.sc.parallelize([1]).map(lambda _:
global_func()).first(), "Yeah")
Review comment:
I ran a test locally:
```python
>>> global_func = lambda: "Hi"
>>> sc.parallelize([1]).map(lambda _: global_func()).first()
'Hi'
>>> global_func = lambda: "Yeah"
>>> sc.parallelize([1]).map(lambda _: global_func()).first()
'Hi'
>>> sc.parallelize([1]).map(lambda _: global_func()).first()
'Yeah'
>>> sc.parallelize([1]).map(lambda _: global_func()).first()
'Hi'
```
Seems it outputs `Hi` or `Yeah` randomly. Is it caused by this cloudpickle
issue?
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