nicktelford commented on code in PR #16041:
URL: https://github.com/apache/kafka/pull/16041#discussion_r1617008040
##########
streams/src/test/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStoreTest.java:
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@@ -490,6 +490,37 @@ public void shouldTimeIteratorDuration() {
assertThat((double) iteratorDurationMaxMetric.metricValue(),
equalTo(3.0 * TimeUnit.MILLISECONDS.toNanos(1)));
}
+ @Test
+ public void shouldTrackOldestOpenIteratorTimestamp() {
+ when(inner.all()).thenReturn(KeyValueIterators.emptyIterator());
+ init();
+
+ final KafkaMetric oldestIteratorTimestampMetric =
metric("oldest-iterator-open-since-ms");
+ assertThat(oldestIteratorTimestampMetric, not(nullValue()));
+
+ assertThat(oldestIteratorTimestampMetric.metricValue(), nullValue());
+
+ final KeyValueIterator<String, String> second;
+ final long secondTimestamp;
+ try (final KeyValueIterator<String, String> first = metered.all()) {
+ final long oldestTimestamp = mockTime.milliseconds();
+ assertThat((Long) oldestIteratorTimestampMetric.metricValue(),
equalTo(oldestTimestamp));
+ mockTime.sleep(100);
+
+ // open a second iterator before closing the first to test that we
still produce the first iterator's timestamp
+ second = metered.all();
+ secondTimestamp = mockTime.milliseconds();
+ assertThat((Long) oldestIteratorTimestampMetric.metricValue(),
equalTo(oldestTimestamp));
+ mockTime.sleep(100);
+ }
+
+ // now that the first iterator is closed, check that the timestamp has
advanced to the still open second iterator
+ assertThat((Long) oldestIteratorTimestampMetric.metricValue(),
equalTo(secondTimestamp));
+ second.close();
Review Comment:
Done. I assumed you were suggesting this in all the tests, so I updated them
all.
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