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https://issues.apache.org/jira/browse/KAFKA-7700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Evan Zhou resolved KAFKA-7700.
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Fix Version/s: 4.2.0
Resolution: Fixed
> AbstractConfig does not honor Properties defaults
> -------------------------------------------------
>
> Key: KAFKA-7700
> URL: https://issues.apache.org/jira/browse/KAFKA-7700
> Project: Kafka
> Issue Type: Bug
> Components: clients, config
> Affects Versions: 2.1.0
> Reporter: Tommy Becker
> Priority: Minor
> Fix For: 4.2.0
>
>
> Kafka clients such as the Consumer and Producer require various configuration
> parameters to work. In the case of the Consumer and Producer, these
> parameters are provided by passing either a {{Map<String, ?>}} or
> {{Properties}} instance to the respective constructor.
> {{Properties}} is a legacy class (akin to {{Vector)}} that adds no value
> above {{Map<String, ?>}} other than the ability to wrap another
> {{Properties}} instance that provides defaults. But Kafka negates this
> benefit by treating the {{Properties}} instance as a {{Map}}, which only
> works due to an unfortunate decision to have {{Properties}} extend
> {{Hashtable}}. Such treatment bypasses the defaults because they are only
> consulted by {{Properties.getProperty()}}. The net result is that when
> creating Kafka clients via {{Properties}}, any configuration from its
> defaults is ignored.
> This has been reported several times over the years as KAFKA-1909,
> KAFKA-2184, KAFKA-3049, and KAFKA-5514.
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