[jira] [Resolved] (KAFKA-13312) 'NetworkDegradeTest#test_rate' should wait until iperf server is listening

["David Jacot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Jacot resolved KAFKA-13312.
---------------------------------
    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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