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

["Stephane Maarek (JIRA)" <ji...@apache.org>]

Stephane Maarek created KAFKA-6007:
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             Summary: 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
    Affects Versions: 0.11.0.1
            Reporter: Stephane Maarek


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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