Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3687#discussion_r22265904
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/TestSuiteBase.scala ---
@@ -104,6 +106,77 @@ class TestOutputStreamWithPartitions[T:
ClassTag](parent: DStream[T],
}
/**
+ * This is an interface that can be used to block until certain events
occur, such as
+ * the start/completion of batches. This is much less brittle than
waiting on wall-clock time.
+ * Internally, this is implemented using a StreamingListener.
Constructing a new instance of this
+ * class automatically registers a StreamingListener on the given
StreamingContext.
+ */
+class StreamingTestWaiter(ssc: StreamingContext) {
+
+ // All access to this state should be guarded by
`StreamingListener.this.synchronized`
--- End diff --
Yep, good catch.
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