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The following commit(s) were added to refs/heads/4.2 by this push:
new f70dc02abbe MINOR: Add 4.2.1 to upgrade.md (#22419) (#22422)
f70dc02abbe is described below
commit f70dc02abbe3625201d0a695ac459e98ac51bc0a
Author: PoAn Yang <[email protected]>
AuthorDate: Sun May 31 02:58:06 2026 +0900
MINOR: Add 4.2.1 to upgrade.md (#22419) (#22422)
Add 4.2.1 notable changes.
(cherry picked from commit 36efcf0667ee6688901e802e3428952d37db59b4)
Reviewers: Chia-Ping Tsai <[email protected]>
---
docs/getting-started/upgrade.md | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/docs/getting-started/upgrade.md b/docs/getting-started/upgrade.md
index e86a8ad0619..f7383a9818e 100644
--- a/docs/getting-started/upgrade.md
+++ b/docs/getting-started/upgrade.md
@@ -26,6 +26,15 @@ type: docs
-->
+## Upgrading to 4.2.1
+
+### Notable changes in 4.2.1
+
+ * Includes a fix for a critical deadlock in the
[KIP-932](https://cwiki.apache.org/confluence/x/4hA0Dw) Share Group path
([KAFKA-20505](https://issues.apache.org/jira/browse/KAFKA-20505)).
+ * Includes a fix for a rolling upgrade issue
([KAFKA-20322](https://issues.apache.org/jira/browse/KAFKA-20322)) that could
cause `UnsupportedVersionException` for clusters using transactional producers.
+
+
+
## Upgrading to 4.2.0
### Upgrading Servers to 4.2.0 from any version 3.3.x through 4.1.x
