Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/11122#discussion_r52401975
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/BasicOperationsSuite.scala
---
@@ -467,6 +467,73 @@ class BasicOperationsSuite extends TestSuiteBase {
testOperation(inputData, updateStateOperation, outputData, true)
}
+ test("updateStateByKey - testing time stamps as input") {
+ type StreamingState = Long
+ val initial: Seq[(String, StreamingState)] = Seq(("a", 0L), ("c", 0L))
+
+ val inputData =
+ Seq(
+ Seq("a"),
+ Seq("a", "b"),
+ Seq("a", "b", "c"),
+ Seq("a", "b"),
+ Seq("a"),
+ Seq()
+ )
+
+ // a -> 1000, 3000, 6000, 10000, 15000, 15000
+ // b -> 0, 2000, 5000, 9000, 9000, 9000
+ // c -> 1000, 1000, 3000, 3000, 3000, 3000
+
+ val outputData: Seq[Seq[(String, StreamingState)]] = Seq(
+ Seq(
+ ("a", 1000L),
+ ("c", 0L)), // t = 1000
+ Seq(
+ ("a", 3000L),
+ ("b", 2000L),
+ ("c", 0L)), // t = 2000
+ Seq(
+ ("a", 6000L),
+ ("b", 5000L),
+ ("c", 3000L)), // t = 3000
+ Seq(
+ ("a", 10000L),
+ ("b", 9000L),
+ ("c", 3000L)), // t = 4000
+ Seq(
+ ("a", 15000L),
+ ("b", 9000L),
+ ("c", 3000L)), // t = 5000
+ Seq(
+ ("a", 15000L),
+ ("b", 9000L),
+ ("c", 3000L)) // t = 6000
+ )
+
+ val updateStateOperation = (s: DStream[String]) => {
+ val initialRDD = s.context.sparkContext.makeRDD(initial)
+ val updateFunc = (time: Time,
+ key: String,
+ values: Seq[Int],
+ state: Option[StreamingState]) => {
+ // Update only if we receive values for this key during the batch.
+ if (values.nonEmpty) {
+ Option(time.milliseconds + state.getOrElse(0L))
+ } else {
+ Option(state.getOrElse(0L))
+ }
+ }
+ val x = s.map(x => (x, 1))
+ x.updateStateByKey[StreamingState](updateFunc = updateFunc,
--- End diff --
nit: not need to create `x`. Just `s.map(x => (x, 1)).updateStateByKey`
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