Outage in Aiven
Kafka upgrade to 3.9 paused
Resolved Minor
June 23, 2026 - Started about 1 month ago
- Lasted 2 days
Incident Report
Summary AI Generated
Aiven paused Kafka 3.8 to 3.9 upgrades for approximately 45 hours due to issues with KRaft migrations, caused by a bug in their migration code and an upstream Kafka bug. Existing Kafka services remained operational throughout, but customers were unable to complete upgrades to version 3.9 during this period. Fixes were deployed and migrations were re-enabled on June 25, 2026.
We have paused Kafka 3.8 ->3.9 upgrades as we are investigating an issue with KRaft migration during the upgrade.
Aiven is actively monitoring affected services and applying mitigations where required.
Impact: Existing Kafka services continue to run. Customers attempting to upgrade Kafka services from version 3.8 to 3.9 will not be able to complete the upgrade while KRaft migrations are paused.
Next update: We will provide an update once more information is available.
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Latest Updates ( sorted recent to last )
MONITORING
about 1 month ago - at 06/25/2026 08:06AM
We have deployed fixes for the issues affecting KRaft migrations during Kafka 3.8 to 3.9 upgrades, and migrations have been re-enabled.
We are continuing to monitor the situation to ensure services remain stable.
If you are experiencing any issues, please contact support.
IDENTIFIED
about 1 month ago - at 06/24/2026 03:01PM
We have identified issues affecting KRaft migrations (Kafka 3.8 to 3.9 upgrades). We have paused all migrations while we work on a fix.
If you are experiencing any issues, please contact support.
IDENTIFIED
about 1 month ago - at 06/23/2026 03:10PM
We have identified two separate problems:
• An issue in migration code
• An upstream bug: https://github.com/apache/kafka/pull/19854
We are working on the fix for the migration issue and back-porting the fix for the upstream bug.
If you have any issues, please contact support.
INVESTIGATING
about 1 month ago - at 06/23/2026 02:18PM
We have paused Kafka 3.8 ->3.9 upgrades as we are investigating an issue with KRaft migration during the upgrade.
Aiven is actively monitoring affected services and applying mitigations where required.
Impact: Existing Kafka services continue to run. Customers attempting to upgrade Kafka services from version 3.8 to 3.9 will not be able to complete the upgrade while KRaft migrations are paused.
Next update: We will provide an update once more information is available.
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