(kafka) branch trunk updated: MINOR: Clarify group.consumer.assignors doc about default assignor change (#22039)

[dajac]

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The following commit(s) were added to refs/heads/trunk by this push:
     new f9d502b6aff MINOR: Clarify group.consumer.assignors doc about default 
assignor change (#22039)
f9d502b6aff is described below

commit f9d502b6aff8fc599aa9bfc93c03253db9e43e99
Author: David Jacot <david.ja...@gmail.com>
AuthorDate: Tue Apr 14 18:05:53 2026 +0200

    MINOR: Clarify group.consumer.assignors doc about default assignor change 
(#22039)
    
    Changing the default server-side assignor does not trigger a rebalance
    for existing groups. The new default takes effect on the next rebalance.
    This patch clarifies that behavior in the config documentation.
    
    Reviewers: Lianet Magrans <lmagr...@confluent.io>
---
 .../java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git 
a/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java
 
b/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java
index b5303be53b1..6d04a812ab4 100644
--- 
a/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java
+++ 
b/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorConfig.java
@@ -216,6 +216,7 @@ public class GroupCoordinatorConfig {
     public static final String CONSUMER_GROUP_ASSIGNORS_CONFIG = 
"group.consumer.assignors";
     public static final String CONSUMER_GROUP_ASSIGNORS_DOC = "The server side 
assignors as a list of either names for builtin assignors or full class names 
for customer assignors. " +
         "The first one in the list is considered as the default assignor to be 
used in the case where the consumer does not specify an assignor. " +
+        "Changing the default assignor does not trigger a rebalance for 
existing groups; the new default takes effect on the next rebalance. " +
         "The supported builtin assignors are: " + 
CONSUMER_GROUP_BUILTIN_ASSIGNORS.stream().map(ConsumerGroupPartitionAssignor::name).collect(Collectors.joining(",
 ")) + ".";
     public static final List<String> CONSUMER_GROUP_ASSIGNORS_DEFAULT = 
CONSUMER_GROUP_BUILTIN_ASSIGNORS
         .stream()