This is an automated email from the ASF dual-hosted git repository.
FrankYang0529 pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/kafka.git
The following commit(s) were added to refs/heads/trunk by this push:
new 36efcf0667e MINOR: Add 4.2.1 to upgrade.md (#22419)
36efcf0667e is described below
commit 36efcf0667ee6688901e802e3428952d37db59b4
Author: PoAn Yang <[email protected]>
AuthorDate: Sat May 30 22:56:37 2026 +0900
MINOR: Add 4.2.1 to upgrade.md (#22419)
Add 4.2.1 notable changes.
Reviewers: Chia-Ping Tsai <[email protected]>
Signed-off-by: PoAn Yang <[email protected]>
---
docs/getting-started/upgrade.md | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/docs/getting-started/upgrade.md b/docs/getting-started/upgrade.md
index 145960a483a..82ff725d40c 100644
--- a/docs/getting-started/upgrade.md
+++ b/docs/getting-started/upgrade.md
@@ -63,6 +63,13 @@ Note: Apache Kafka 4.3 only supports KRaft mode - ZooKeeper
mode has been remove
* A new dynamic broker configuration
`follower.fetch.last.tiered.offset.enable` (default: `false`) has been added.
When enabled on a cluster with tiered storage, a newly added follower replica
that has no local data will skip directly to the earliest pending upload offset
on the leader, avoiding re-fetching data that is already stored in remote
storage. This reduces bootstrap time significantly for large tiered-storage
topics. For further details, please refer to [KIP-1023](https://cwi [...]
* The `ListOffsets` API has been extended to version 11, adding support for
the `EARLIEST_PENDING_UPLOAD_TIMESTAMP` (-6) timestamp type. This allows
clients to query the earliest offset on the leader that has not yet been
uploaded to tiered storage. For further details, please refer to
[KIP-1023](https://cwiki.apache.org/confluence/x/8op3EQ).
+## 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
