Re: [PR] KAFKA-19112 Unifying LIST-Type Configuration Validation and Default Values [kafka]

["chia7712 (via GitHub)" <gi...@apache.org>]

chia7712 commented on code in PR #20334:
URL: https://github.com/apache/kafka/pull/20334#discussion_r2676282206


##########
docs/upgrade.html:
##########
@@ -113,6 +113,35 @@ <h5><a id="upgrade_420_notable" href="#upgrade_420_notable">Notable changes in 4
     <li>
         The <code>num.replica.fetchers</code> config has a new lower bound of 1.
     </li>
+    <li>
+        Improvements have been made to the validation rules and default values of LIST-type configurations
+        (<a href="https://cwiki.apache.org/confluence/x/HArXF">KIP-1161</a>).
+        <ul>
+            <li>
+                LIST-type configurations now enforce stricter validation:
+                <ul>
+                    <li>Null values are no longer accepted for most LIST-type configurations, except those that explicitly
+                        allow a null default value or where a null value has a well-defined semantic meaning.</li>
+                    <li>Duplicate entries within the same list are no longer permitted.</li>

Review Comment:
   open https://issues.apache.org/jira/browse/KAFKA-20055



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