mirror of https://github.com/apache/kafka.git
0a12eaa80e
We add the three main changes in this PR - Disallowing null values for most LIST-type configurations makes sense, since users cannot explicitly set a configuration to null in a properties file. Therefore, only configurations with a default value of null should be allowed to accept null. - Disallowing duplicate values is reasonable, as there are currently no known configurations in Kafka that require specifying the same value multiple times. Allowing duplicates is both rare in practice and potentially confusing to users. - Disallowing empty list, even though many configurations currently accept them. In practice, setting an empty list for several of these configurations can lead to server startup failures or unexpected behavior. Therefore, enforcing non-empty lists helps prevent misconfiguration and improves system robustness. These changes may introduce some backward incompatibility, but this trade-off is justified by the significant improvements in safety, consistency, and overall user experience. Additionally, we introduce two minor adjustments: - Reclassify some STRING-type configurations as LIST-type, particularly those using comma-separated values to represent multiple entries. This change reflects the actual semantics used in Kafka. - Update the default values for some configurations to better align with other configs. These changes will not introduce any compatibility issues. Reviewers: Jun Rao <junrao@gmail.com>, Chia-Ping Tsai <chia7712@gmail.com> |
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