[jira] [Created] (KAFKA-5204) Connect needs to validate Connector type during instantiation

["Konstantine Karantasis (JIRA)" <ji...@apache.org>]

Konstantine Karantasis created KAFKA-5204:
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             Summary: Connect needs to validate Connector type during instantiation
                 Key: KAFKA-5204
                 URL: https://issues.apache.org/jira/browse/KAFKA-5204
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 0.10.2.0
            Reporter: Konstantine Karantasis
            Assignee: Konstantine Karantasis
             Fix For: 0.11.0.0, 0.10.2.1


Currently Connect will accept to instantiate connectors that extend the {{Connector}} abstract class but not one of its subclasses, {{SourceConnector}} or {{SinkConnector}}. 

However, in distributed mode as well as in REST, Connect assumes in a few places that there are only two types of connectors, sinks or sources. Based on this assumption it checks the type dynamically, and if it is not a sink it treats it as a source (by constructing the corresponding configs). 

A connector that implements only the {{Connector}} abstract class does not fit into this classification. Therefore a validation needs to take place early, during the instantiation of the {{Connector}} object. 



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