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https://issues.apache.org/jira/browse/KAFKA-10876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pranav Siby reassigned KAFKA-10876:
-----------------------------------
Assignee: Pranav Siby
> Duplicate connector/task create requests lead to incorrect FAILED status
> ------------------------------------------------------------------------
>
> Key: KAFKA-10876
> URL: https://issues.apache.org/jira/browse/KAFKA-10876
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Reporter: Chris Egerton
> Assignee: Pranav Siby
> Priority: Major
>
> If a Connect worker tries to start a connector or task that it is already
> running, an error will be logged and the connector/task will be marked as
> {{FAILED}}. This logic is implemented in several places:
> *
> [https://github.com/apache/kafka/blob/300909d9e60eb1d5e80f4d744d3662a105ac0c15/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L257-L262]
> *
> [https://github.com/apache/kafka/blob/300909d9e60eb1d5e80f4d744d3662a105ac0c15/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L299-L306]
> *
> [https://github.com/apache/kafka/blob/300909d9e60eb1d5e80f4d744d3662a105ac0c15/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L511-L512]
> *
> [https://github.com/apache/kafka/blob/300909d9e60eb1d5e80f4d744d3662a105ac0c15/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L570-L572]
>
> Although it's certainly abnormal for a worker to run into this case and an
> {{ERROR}}-level log message is warranted when it occurs, the connector/task
> should not be marked as {{FAILED}}, as there is still an instance of that
> connector/task still running on the worker.
>
> Either the worker logic should be updated to avoid marking connectors/tasks
> as {{FAILED}} in this case, or it should manually halt the existing
> connector/task before creating a new instance in its place. The first option
> is easier and more intuitive, but if it's possible that the already-running
> connector/task instance has an outdated configuration and the to-be-created
> connector/task has an up-to-date configuration, the second option would have
> correct behavior (while the first would not).
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