[jira] [Resolved] (KAFKA-6007) Connect can't validate against transforms in plugins.path

["Greg Harris (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-6007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Greg Harris resolved KAFKA-6007.
--------------------------------
      Assignee: Greg Harris  (was: Konstantine Karantasis)
    Resolution: Fixed

> Connect can't validate against transforms in plugins.path
> ---------------------------------------------------------
>
>                 Key: KAFKA-6007
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6007
>             Project: Kafka
>          Issue Type: Bug
>          Components: KafkaConnect
>    Affects Versions: 0.11.0.0, 0.11.0.1, 1.0.0
>            Reporter: Stephane Maarek
>            Assignee: Greg Harris
>            Priority: Major
>             Fix For: 1.0.3, 1.1.2, 2.0.2, 2.1.2, 2.3.2, 2.5.0, 2.4.0, 2.2.2
>
>
> Kafka Connect can't validate a custom transformation if placed in plugins path.
> Here's the output I get on the validate call:
> {code:java}
> Invalid value com.mycorp.kafka.transforms.impl.FlattenSinkRecord for configuration transforms.Flat.type: Class com.mycorp.kafka.transforms.impl.FlattenSinkRecord could not be found.
> Invalid value null for configuration transforms.Flat.type: Not a Transformation
> "recommended_values": [   
> "com.mycorp.kafka.transforms.Flatten$Key",
> "com.mycorp.kafka.transforms.Flatten$Value",
> "com.mycorp.kafka.transforms.impl.FlattenSinkRecord",
> "org.apache.kafka.connect.transforms.Cast$Key",
> "org.apache.kafka.connect.transforms.Cast$Value",
> "org.apache.kafka.connect.transforms.ExtractField$Key",
> "org.apache.kafka.connect.transforms.ExtractField$Value",
> "org.apache.kafka.connect.transforms.Flatten$Key",
> "org.apache.kafka.connect.transforms.Flatten$Value",
> "org.apache.kafka.connect.transforms.HoistField$Key",
> "org.apache.kafka.connect.transforms.HoistField$Value",
> "org.apache.kafka.connect.transforms.InsertField$Key",
> "org.apache.kafka.connect.transforms.InsertField$Value",
> "org.apache.kafka.connect.transforms.MaskField$Key",
> "org.apache.kafka.connect.transforms.MaskField$Value",
> "org.apache.kafka.connect.transforms.RegexRouter",
> "org.apache.kafka.connect.transforms.ReplaceField$Key",
> "org.apache.kafka.connect.transforms.ReplaceField$Value",
> "org.apache.kafka.connect.transforms.SetSchemaMetadata$Key",
> "org.apache.kafka.connect.transforms.SetSchemaMetadata$Value",
> "org.apache.kafka.connect.transforms.TimestampConverter$Key",
> "org.apache.kafka.connect.transforms.TimestampConverter$Value",
> "org.apache.kafka.connect.transforms.TimestampRouter",
> "org.apache.kafka.connect.transforms.ValueToKey"],
> {code}
> As you can see the class appear in the recommended values (!) but can't be picked up on the validate call. 
> I believe it's because the recommender implements class discovery using plugins:
> https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectorConfig.java#L194
> But the class inference itself doesn't:
> https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/ConnectorConfig.java#L199
> (I'm not an expert in class loading though, just a guess... Unsure how to fix)
> A quick fix is to add the transformations in the ClassPath itself, but that defeats the point a bit. 



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