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https://issues.apache.org/jira/browse/KAFKA-14858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yash Mayya reassigned KAFKA-14858:
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Assignee: (was: Yash Mayya)
> Standalone herder does not handle exceptions thrown from connector
> taskConfigs method
> -------------------------------------------------------------------------------------
>
> Key: KAFKA-14858
> URL: https://issues.apache.org/jira/browse/KAFKA-14858
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Reporter: Chris Egerton
> Priority: Major
>
> In distributed mode, if a connector throws an exception from its
> {{taskConfigs}} method (invoked by the herder, through the {{Worker}} class,
> [here|https://github.com/apache/kafka/blob/f3e4dd922933bf28b2c091e846cbc4e5255dd1d5/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L1960]),
> we wait for an exponential backoff period (see KAFKA-14732) and then [retry
> the
> operation|https://github.com/apache/kafka/blob/f3e4dd922933bf28b2c091e846cbc4e5255dd1d5/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L1907-L1911].
> However, in standalone mode, not only do we not retry the operation, we do
> not even log the exception. In addition, when REST calls are made that
> require generating new task configs for a connector (which include creating
> and reconfiguring a connector), if the connector's {{taskConfigs}} method
> throws an exception, those requests will time out since the
> [callback|https://github.com/apache/kafka/blob/f3e4dd922933bf28b2c091e846cbc4e5255dd1d5/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/standalone/StandaloneHerder.java#L183]
> we use to respond to those requests never gets invoked.
> At a bare minimum, we should:
> * Log any exceptions thrown from the {{taskConfigs}} method at {{ERROR}}
> level
> * Invoke any callbacks passed in to the relevant {{StandaloneHerder}}
> methods with any exceptions thrown by the {{taskConfigs}} method
> We might also consider introducing the same kind of exponential backoff retry
> logic used by distributed mode, but this can be addressed separately since it
> would be a much larger change in behavior and may break existing user's
> deployments.
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