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https://issues.apache.org/jira/browse/KAFKA-15473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17766578#comment-17766578
]
Greg Harris commented on KAFKA-15473:
-------------------------------------
it appears that the bug which prompted the fix in KAFKA-15244 (wrong PluginType
being inferred) also could cause duplicates. For example:
{noformat}
{
"class": "org.apache.kafka.connect.storage.StringConverter",
"type": "converter"
},
{
"class": "org.apache.kafka.connect.storage.StringConverter",
"type": "converter"
},{noformat}
Here, the second entry should have been "header_converter". So while there are
more duplicates in 3.6.0-rc0 than there were in <3.6.0-rc0, the presence of
duplicates is not new. We wouldn't be breaking any third-party clients, because
they would already have to handle these duplicates.
> Connect connector-plugins endpoint shows duplicate plugins
> ----------------------------------------------------------
>
> Key: KAFKA-15473
> URL: https://issues.apache.org/jira/browse/KAFKA-15473
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 3.6.0
> Reporter: Greg Harris
> Assignee: Greg Harris
> Priority: Blocker
> Fix For: 3.6.0
>
>
> In <3.6.0-rc0, only one copy of each plugin would be shown. For example:
> {noformat}
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },{noformat}
> In 3.6.0-rc0, there are multiple listings for the same plugin. For example:
>
> {noformat}
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter"
> },
> {
> "class": "org.apache.kafka.connect.storage.StringConverter",
> "type": "converter",
> "version": "3.6.0"
> },{noformat}
> These duplicates appear to happen when a plugin with the same class name
> appears in multiple locations/classloaders.
> When interpreting a connector configuration, only one of these plugins will
> be chosen, so only one is relevant to show to users. The REST API should only
> display the plugins which are eligible to be loaded, and hide the duplicates.
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