(kafka) branch 4.0 updated: MINOR: Ensure proper visibility of attribute accesses across threads (#21023)

[chia7712]

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chia7712 pushed a commit to branch 4.0
in repository https://gitbox.apache.org/repos/asf/kafka.git


The following commit(s) were added to refs/heads/4.0 by this push:
     new 0deeb8f8c86 MINOR: Ensure proper visibility of attribute accesses 
across threads (#21023)
0deeb8f8c86 is described below

commit 0deeb8f8c86ff80f72a6aef0b1065162915d3ec3
Author: majialong <majialo...@gmail.com>
AuthorDate: Mon Dec 1 16:45:30 2025 +0800

    MINOR: Ensure proper visibility of attribute accesses across threads 
(#21023)
    
    backport https://github.com/apache/kafka/pull/21014.
    
    In 4.0, `MetadataImage` has not yet been introduced into
    `GroupCoordinatorService`. Therefore, this patch only includes changes
    to `CoordinatorRuntime`.
    
    Reviewers: Chia-Ping Tsai <chia7...@gmail.com>
---
 .../org/apache/kafka/coordinator/common/runtime/CoordinatorRuntime.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git 
a/coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntime.java
 
b/coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntime.java
index 51ce267da2e..ad5f76a468d 100644
--- 
a/coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntime.java
+++ 
b/coordinator-common/src/main/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntime.java
@@ -571,7 +571,7 @@ public class CoordinatorRuntime<S extends 
CoordinatorShard<U>, U> implements Aut
         /**
          * The current state.
          */
-        CoordinatorState state;
+        volatile CoordinatorState state;
 
         /**
          * The current epoch of the coordinator. This represents