[jira] [Commented] (KAFKA-10353) Trogdor - Fix RoundTripWorker to not fail when the topic it's trying to create already exists

["Ismael Juma (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-10353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17170805#comment-17170805 ] 

Ismael Juma commented on KAFKA-10353:
-------------------------------------

Looks like a duplicate of KAFKA-10308.

> Trogdor - Fix RoundTripWorker to not fail when the topic it's trying to create already exists
> ---------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-10353
>                 URL: https://issues.apache.org/jira/browse/KAFKA-10353
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Stanislav Kozlovski
>            Priority: Major
>
> Trogdor's RoundTripWorker calls WorkerUtils#createTopics with a failOnCreate flag equal to true, making the code throw an exception if the topic already exists.
> [https://github.com/apache/kafka/blob/28b7d8e21656649fb09b09f9bacfe865b0ca133c/tools/src/main/java/org/apache/kafka/trogdor/workload/RoundTripWorker.java#L149]
> This is prone to race conditions when scheduling multiple workers to start at the same time - only one will succeed in creating a topic and running the test, while the rest will end up with a fatal error
> This has also been seen to happen in the RoundTripFaultTest system test where a network exception can cause the CreateTopics request to reach Kafka but Trogdor retry it and hit a TopicAlreadyExists exception on the retry, failing the test.



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