Jason Gustafson created KAFKA-10140:
---------------------------------------

             Summary: Incremental config api excludes plugin config changes
                 Key: KAFKA-10140
                 URL: https://issues.apache.org/jira/browse/KAFKA-10140
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Gustafson
             Fix For: 2.6.0


I was trying to alter the jmx metric filters using the incremental alter config 
api and hit this error:
```
java.util.NoSuchElementException: key not found: metrics.jmx.blacklist
        at scala.collection.MapLike.default(MapLike.scala:235)
        at scala.collection.MapLike.default$(MapLike.scala:234)
        at scala.collection.AbstractMap.default(Map.scala:65)
        at scala.collection.MapLike.apply(MapLike.scala:144)
        at scala.collection.MapLike.apply$(MapLike.scala:143)
        at scala.collection.AbstractMap.apply(Map.scala:65)
        at kafka.server.AdminManager.listType$1(AdminManager.scala:681)
        at 
kafka.server.AdminManager.$anonfun$prepareIncrementalConfigs$1(AdminManager.scala:693)
        at 
kafka.server.AdminManager.prepareIncrementalConfigs(AdminManager.scala:687)
        at 
kafka.server.AdminManager.$anonfun$incrementalAlterConfigs$1(AdminManager.scala:618)
        at 
scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:273)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:154)
        at scala.collection.TraversableLike.map(TraversableLike.scala:273)
        at scala.collection.TraversableLike.map$(TraversableLike.scala:266)
        at scala.collection.AbstractTraversable.map(Traversable.scala:108)
        at 
kafka.server.AdminManager.incrementalAlterConfigs(AdminManager.scala:589)
        at 
kafka.server.KafkaApis.handleIncrementalAlterConfigsRequest(KafkaApis.scala:2698)
        at kafka.server.KafkaApis.handle(KafkaApis.scala:188)
        at kafka.server.KafkaRequestHandler.run(KafkaRequestHandler.scala:78)
        at java.base/java.lang.Thread.run(Thread.java:834)
```

It looks like we are only allowing changes to the keys defined in `KafkaConfig` 
through this API. This excludes config changes to any plugin components such as 
`JmxReporter`. 

Note that I was able to use the regular `alterConfig` API to change this config.



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