Stanislav Kozlovski created KAFKA-7266:
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Summary: Fix MetricsTest test flakiness
Key: KAFKA-7266
URL: https://issues.apache.org/jira/browse/KAFKA-7266
Project: Kafka
Issue Type: Improvement
Reporter: Stanislav Kozlovski
Assignee: Stanislav Kozlovski
Fix For: 2.0.1, 2.1.0
The test `kafka.api.MetricsTest.testMetrics` has been failing intermittently in
kafka builds (recent proof:
https://github.com/apache/kafka/pull/5436#issuecomment-409683955)
The particular failure is in the `MessageConversionsTimeMs` metric assertion -
{code}
java.lang.AssertionError: Message conversion time not recorded 0.0
{code}
There has been work done previously (https://github.com/apache/kafka/pull/4681)
to combat the flakiness of the test and while it has improved it, the test
still fails sometimes.
h3. Solution
On my machine, the test failed 5 times out of 25 runs. I suspect the solution
would be to increase the record batch size to ensure the conversion takes more
than 1ms time so as to be recorded by the metric. Increasing the maximum batch
size from 1MB to 8MB made the test fail locally once out of 100 times. Setting
it to 16MBs seems to fix the problem. I've ran 300 runs and have not seen a
failure with 16MBs set as the batch size
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