Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/9263#discussion_r43189612
--- Diff: python/pyspark/mllib/tests.py ---
@@ -76,7 +76,8 @@
pass
ser = PickleSerializer()
-sc = SparkContext('local[4]', "MLlib tests")
+conf = SparkConf().set("spark.driver.allowMultipleContexts", "true")
--- End diff --
Yeah, you shouldn't set this. The parallelism in `dev/run-tests` will
actually launch separate JVMs, so that's not the cause of this problem. In
general, you should _never_ set `spark.driver.allowMultipleContexts` (it was
only added as an escape-hatch backwards-compatibility option for a feature that
we never properly supported).
There must be some other problem in the tests, likely due to test cleanup
or SparkContext teardown not being executed properly.
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