[jira] [Assigned] (KAFKA-13306) Null connector config value passes validation, but fails creation

["Andras Katona (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-13306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andras Katona reassigned KAFKA-13306:
-------------------------------------

    Assignee: Andras Katona

> Null connector config value passes validation, but fails creation
> -----------------------------------------------------------------
>
>                 Key: KAFKA-13306
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13306
>             Project: Kafka
>          Issue Type: Bug
>          Components: KafkaConnect
>            Reporter: Laszlo Istvan Hunyady
>            Assignee: Andras Katona
>            Priority: Major
>
> When validating a connector config containing a property with a null value the validation passes, but when creating a connector with the same config the worker fails to start the connector because of an invalid config.
> Steps to reproduce:
>  # Send PUT request to
>  \{\{connectRest\}\}/connector-plugins/FileStreamSource/config/validate
>  Request body:
> {code}
> {
>   "connector.class": "FileStreamSource",
>   "name": "file-source",
>   "topic": "target-topic",
>   "file":"/source.txt",
>   "tasks.max": "1",
>   "foo": null
> }
> {code}
> Response:
> {code}
> { "name": "FileStreamSource", "error_count": 0, ... }
> {code}
>  #  OPTION A:
>  Send PUT request to
>  \{\{connectRest}}/connectors/file-source/config
>  Request body:
> {code}
> {
>   "connector.class": "FileStreamSource",
>   "name": "file-source",
>   "topic": "target-topic",
>   "file":"/source.txt",
>   "tasks.max": "1",
>   "foo": null
> }
> {code}
> OPTION B:
>  Send POST request to
>  \{\{connectRest}}/connectors/
>  Request Body:
> {code}
> {
>   "connector.class": "FileStreamSource",
>   "name": "file-source",
>   "topic": "target-topic",
>   "file":"/source.txt",
>   "tasks.max": "1",
>   "foo": null
> }
> {code}
> Result:
> Connector is created but connector fails to start, with below exception that indicates an invalid config:
> {noformat}
>  ERROR org.apache.kafka.connect.runtime.WorkerConnector: [file-source|worker] WorkerConnector\{id=file-source} Error initializing connector
>  java.lang.ClassCastException: Non-string value found in original settings for key foo: null
>  at org.apache.kafka.common.config.AbstractConfig.originalsStrings(AbstractConfig.java:234)
>  at org.apache.kafka.connect.runtime.WorkerConnector.initialize(WorkerConnector.java:77)
>  at org.apache.kafka.connect.runtime.Worker.startConnector(Worker.java:256)
>  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:1190)
>  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.processConnectorConfigUpdates(DistributedHerder.java:548)
>  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.tick(DistributedHerder.java:395)
>  at org.apache.kafka.connect.runtime.distributed.DistributedHerder.run(DistributedHerder.java:289)
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>  at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  at java.lang.Thread.run(Thread.java:748)
> {noformat}
>  



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