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https://issues.apache.org/jira/browse/KAFKA-18904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17931909#comment-17931909
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Andrew Schofield commented on KAFKA-18904:
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[~yangpoan]Absolutely, please go ahead.
> Listing of configs for dynamically created resources is mysterious
> ------------------------------------------------------------------
>
> Key: KAFKA-18904
> URL: https://issues.apache.org/jira/browse/KAFKA-18904
> Project: Kafka
> Issue Type: Improvement
> Reporter: Andrew Schofield
> Assignee: PoAn Yang
> Priority: Major
> Labels: needs-kip
>
> The `kafka-configs.sh` tool can be used to set configurations on dynamically
> created resources such as groups and client metrics. However, the way that
> listing of the configs works is unhelpful.
> bin/kafka-configs.sh --bootstrap-server localhost:9092 --alter --group G1
> --add-config consumer.heartbeat.interval.ms=10000
> * This defines the config consumer.heartbeat.interval.ms
> bin/kafka-configs.sh --bootstrap-server localhost:9092 --describe
> --entity-type groups
> * This only describes the configs of groups that actually exist, as will
> happen when the group actually has started being used.
> bin/kafka-configs.sh --bootstrap-server localhost:9092 --describe
> --entity-type groups --entity-name G1
> * This actually displays the configs for G1.
> The problem is that using `--describe` with no entity name, the tool lists
> the resources (the groups) not the configs. As a result, if you define
> configs in preparation for the use of groups in the future, you need to
> remember what you created. You cannot list the groups for which configs are
> defined, only the groups which actually exist from the point of view of the
> group coordinator.
> Client metrics are a bit better because there is at least an RPC for listing
> the client metrics resources.
> There is a second class of related problem.
> bin/kafka-configs.sh --bootstrap-server localhost:9092 --describe
> --entity-type groups --entity-name DOESNOTEXIST
> * This does not return an error for a non-existent resource.
> bin/kafka-configs.sh --bootstrap-server localhost:9092 --describe
> --entity-type client-metrics --entity-name DOESNOTEXIST
> * This does not return an error for a non-existent resource.
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