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https://issues.apache.org/jira/browse/KAFKA-2702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14986744#comment-14986744
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Jun Rao commented on KAFKA-2702:
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[~granthenke], we can probably do the following.
1. Remove the required field.
2. Change all instances of non-required field to default to null.
3. Allow null as a default value.
4. Print the null default value properly in html output.
> ConfigDef toHtmlTable() sorts in a way that is a bit confusing
> --------------------------------------------------------------
>
> Key: KAFKA-2702
> URL: https://issues.apache.org/jira/browse/KAFKA-2702
> Project: Kafka
> Issue Type: Bug
> Reporter: Gwen Shapira
> Assignee: Grant Henke
> Attachments: ConsumerConfig-After.html, ConsumerConfig-Before.html
>
>
> Because we put everything without default first (without prioritizing),
> critical parameters get placed below low priority ones when they both have
> no defaults. Some parameters are without default and optional (SASL server in
> ConsumerConfig for instance).
> Try printing ConsumerConfig parameters and see the mandatory group.id show up
> as #15.
> I suggest sorting the no-default parameters by priority as well, or perhaps
> adding a "REQUIRED" category that gets printed first no matter what.
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