Github user jaceklaskowski commented on a diff in the pull request:
https://github.com/apache/spark/pull/16492#discussion_r95065464
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamTest.scala ---
@@ -235,7 +235,10 @@ trait StreamTest extends QueryTest with
SharedSQLContext with Timeouts {
*/
def testStream(
_stream: Dataset[_],
- outputMode: OutputMode = OutputMode.Append)(actions: StreamAction*):
Unit = {
+ outputMode: OutputMode = OutputMode.Append)(actions: StreamAction*):
Unit = synchronized {
+ // `synchronized` is added to prevent the user from calling
`testStream` concurrently because
--- End diff --
Can you elaborate why `StreamingQueryListener` can be used concurrently?
I'm reading the comment: "it does not work because something else does not
work". Why? What's wrong with `StreamingQueryListener`?
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