VictorvandenHoven commented on code in PR #14426:
URL: https://github.com/apache/kafka/pull/14426#discussion_r1358134854
##########
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamKStreamLeftJoinTest.java:
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@@ -436,6 +436,239 @@ public void
testRightNonJoinedRecordsAreNeverEmittedByTheRightProcessor() {
}
}
+ @Test
+ public void testLeftNonJoinedRecordsWithZeroAfterAreEmitted() {
+ final StreamsBuilder builder = new StreamsBuilder();
+
+ final int[] expectedKeys = new int[] {0, 1, 2, 3};
+
+ final KStream<Integer, String> stream1;
+ final KStream<Integer, String> stream2;
+ final KStream<Integer, String> joined;
+ final MockApiProcessorSupplier<Integer, String, Void, Void> supplier =
new MockApiProcessorSupplier<>();
+ stream1 = builder.stream(topic1, consumed);
+ stream2 = builder.stream(topic2, consumed);
+
+ joined = stream1.leftJoin(
+ stream2,
+ MockValueJoiner.TOSTRING_JOINER,
+ JoinWindows.ofTimeDifferenceWithNoGrace(ofMillis(100)).after(ZERO),
+ StreamJoined.with(Serdes.Integer(),
+ Serdes.String(),
+ Serdes.String())
+ );
+ joined.process(supplier);
+
+ final Collection<Set<String>> copartitionGroups =
+
TopologyWrapper.getInternalTopologyBuilder(builder.build()).copartitionGroups();
+
+ assertEquals(1, copartitionGroups.size());
+ assertEquals(new HashSet<>(Arrays.asList(topic1, topic2)),
copartitionGroups.iterator().next());
+
+ try (final TopologyTestDriver driver = new
TopologyTestDriver(builder.build(), PROPS)) {
+ final TestInputTopic<Integer, String> inputTopic1 =
+ driver.createInputTopic(topic1, new IntegerSerializer(),
new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
+ final TestInputTopic<Integer, String> inputTopic2 =
+ driver.createInputTopic(topic2, new IntegerSerializer(),
new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
+ final MockApiProcessor<Integer, String, Void, Void> processor =
supplier.theCapturedProcessor();
+
+ processor.init(null);
+ // push four items with increasing timestamps to the primary
stream; this should emit null-joined items
+ // w1 = {}
+ // w2 = {}
+ // --> w1 = { 0:B0 (ts: 1000), 1:B1 (ts: 1001), 2:B2 (ts: 1002),
3:B3 (ts: 1003) }
+ // w2 = {}
+ final long time = 1000L;
+ for (int i = 0; i < expectedKeys.length; i++) {
+ inputTopic1.pipeInput(expectedKeys[i], "B" + expectedKeys[i],
time + i);
+ }
+ processor.checkAndClearProcessResult(
+ new KeyValueTimestamp<>(0, "B0+null", 1000L),
+ new KeyValueTimestamp<>(1, "B1+null", 1001L),
+ new KeyValueTimestamp<>(2, "B2+null", 1002L)
+ );
+ }
Review Comment:
No,it is a leftjoin with joinwindows 100ms before and 0ms after.
So directly at timestamp of B0, B1 and B2 the not-joined record will be
emitted.
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