rkhachatryan commented on a change in pull request #16415:
URL: https://github.com/apache/flink/pull/16415#discussion_r666066907
##########
File path:
flink-tests/src/test/java/org/apache/flink/test/streaming/api/FileReadingWatermarkITCase.java
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@@ -62,8 +64,17 @@ public void testWatermarkEmissionWithChaining() throws
Exception {
JobExecutionResult result = env.execute();
int actual = result.getAccumulatorResult(NUM_WATERMARKS_ACC_NAME);
-
- assertTrue("too few watermarks emitted: " + actual, actual >=
MIN_EXPECTED_WATERMARKS);
+ long expected =
+ result.<Long>getAccumulatorResult(RUNTIME_ACC_NAME) /
WATERMARK_INTERVAL_MILLIS;
+ checkState(expected > MIN_EXPECTED_WATERMARKS);
+
+ assertEquals(
+ "too few watermarks emitted in "
+ + result.<Long>getAccumulatorResult(RUNTIME_ACC_NAME)
+ + " ms",
+ expected,
+ actual,
+ .5 * expected);
Review comment:
> Does it mean that the number of checkpoints can be just half of the
expected number?
You mean watermarks, not checkpoints, right?
The value is just an empirical number because there are no guarantees
regarding the watermark interval (or am I wrong?)
I'm afraid decreasing it would make the test more flaky (it does fail with
`.2` sometimes and rarely with `.3`).
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