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https://issues.apache.org/jira/browse/KAFKA-13312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-13312.
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Resolution: Fixed
> 'NetworkDegradeTest#test_rate' should wait until iperf server is listening
> --------------------------------------------------------------------------
>
> Key: KAFKA-13312
> URL: https://issues.apache.org/jira/browse/KAFKA-13312
> Project: Kafka
> Issue Type: Bug
> Reporter: David Jacot
> Assignee: David Jacot
> Priority: Minor
>
> We have seen multiple failures with the following logs:
> {noformat}
> [DEBUG - 2021-09-17 09:57:58,603 - remoteaccount - _log - lineno:160]:
> ubuntu@worker26: Running ssh command: iperf -i 1 -t 20 -f k -c worker25 [INFO
> - 2021-09-17 09:57:58,611 - network_degrade_test - test_rate - lineno:114]:
> iperf output connect failed: Connection refused
> {noformat}
> The iperf client can not connect to the iperf server. The test launches the
> server and then immediately launches the client but there is not guarantee
> that the server listens when the client is started.
> It seems that we should add a condition to wait until the server prints
> `Server listening` before starting the client.
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