[jira] [Commented] (KAFKA-13718) kafka-topics describe topic with default config will show `segment.bytes` overridden config

["Richard Joerger (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-13718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17538975#comment-17538975 ] 

Richard Joerger commented on KAFKA-13718:
-----------------------------------------

I'd love to help out on this particular Jira. I'm new to the project so I apologize for any silly questions. It seems that we as a community need to discuss what the output of the kafka-topics tooling should look like. When we're looking at the documentation, I don't see any documentation explicitly stating that the kafka-topics output will only show the non-default configurations. As I understand it this is something that is just "known" among the community but isn't necessarily explicit. This leads me to a few points of question. 

1) Do we want to open a new issue to update the documentation for kafka-topics to make that explicit (or am I mistaken on this?)

2) Looking at the documentation for segment.bytes, this (1073741824) is the default value. When I was investigating the code base, it seems to be the default value in there as well. I'm not sure how much benefit there would be to including this configuration vs. not including this configuration. 

3) I know this isn't an API change but is still user facing, would this require a KIP to change?

4) Where in the code base does this value reside? In my digging, it seems to reside in kafkaConfig.scala:112 but that's 1* 1024 * 1024 *1024 = 1073741824 so perhaps there is an issue of comparison? I'd love to tackle this but need some guidance if at all possible. 

Thanks

> kafka-topics describe topic with default config will show `segment.bytes` overridden config 
> --------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-13718
>                 URL: https://issues.apache.org/jira/browse/KAFKA-13718
>             Project: Kafka
>          Issue Type: Bug
>          Components: tools
>    Affects Versions: 3.1.0, 2.8.1, 3.0.0
>            Reporter: Luke Chen
>            Priority: Major
>              Labels: newbie, newbie++
>
> Following the quickstart guide[1], when describing the topic just created with default config, I found there's a overridden config shown:
> _> bin/kafka-topics.sh --describe --topic quickstart-events --bootstrap-server localhost:9092_
> _Topic: quickstart-events   TopicId: 06zRrzDCRceR9zWAf_BUWQ    PartitionCount: 1    ReplicationFactor: 1    *Configs: segment.bytes=1073741824*_
>     _Topic: quickstart-events    Partition: 0    Leader: 0    Replicas: 0    Isr: 0_
>  
> This config result should be empty as in Kafka quick start page. Although the config value is what we expected (default 1GB value), this info display still confuse users.
>  
> Note: I checked the 2.8.1 build, this issue also happened.
>  
> [1]: [https://kafka.apache.org/quickstart]



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