Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18561#discussion_r126080296
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/test/SharedSQLContext.scala ---
@@ -61,8 +61,10 @@ trait SharedSQLContext extends SQLTestUtils with
BeforeAndAfterEach with Eventua
*/
protected override def beforeAll(): Unit = {
SparkSession.sqlListener.set(null)
- if (_spark == null) {
- _spark = createSparkSession
+ synchronized {
--- End diff --
`beforeAll` ought to be called by one thread in the test framework before
any tests start. I doubt this is the reason, but, maybe I don't have the full
context here.
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