Divij Vaidya created KAFKA-13911:
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Summary: Rate is calculated as NaN for minimum config values
Key: KAFKA-13911
URL: https://issues.apache.org/jira/browse/KAFKA-13911
Project: Kafka
Issue Type: Bug
Reporter: Divij Vaidya
Assignee: Divij Vaidya
Implementation of connection creation rate quotas in Kafka is dependent on two
configurations:
#
[quota.window.num|https://kafka.apache.org/documentation.html#brokerconfigs_quota.window.num]
#
[quota.window.size.seconds|https://kafka.apache.org/documentation.html#brokerconfigs_quota.window.size.seconds]
The minimum possible values of these configuration is 1 as per the
documentation. However, 1 as a minimum value for quota.window.num is invalid
and leads to failure for calculation of rate as demonstrated below.
As a proof of the bug, the following unit test fails:
{code:java}
@Test
public void testUseWithMinimumPossibleConfiguration() {
final Rate r = new Rate();
MetricConfig config = new MetricConfig().samples(1).timeWindow(1,
TimeUnit.SECONDS);
Time elapsed = new MockTime();
r.record(config, 1.0, elapsed.milliseconds());
elapsed.sleep(100);
r.record(config, 1.0, elapsed.milliseconds());
elapsed.sleep(1000);
final Double observedRate = r.measure(config, elapsed.milliseconds());
assertFalse(Double.isNaN(observedRate));
} {code}
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