[v25.3.x] kafka: fix partition_response for LogAppendTime topics#29301
Merged
WillemKauf merged 2 commits intoredpanda-data:v25.3.xfrom Jan 16, 2026
Merged
Conversation
According to the Kafka protocol, ``` https://github.com/redpanda-data/redpanda/blob/dev/src/v/kafka/protocol/schemata/produce_response.json The timestamp returned by broker after appending the messages. If CreateTime is used for the topic, the timestamp will be -1. If LogAppendTime is used for the topic, the timestamp will be the broker local time when the messages are appended. ``` Unfortunately we were not setting this field correctly in the `partition_response` for `LogAppendTime` topics, leading Kafka clients to always interpret the response as `CreateTime`. Fix it by setting `log_append_time_ms` in the `partition_response` to the batch's `max_timestamp` (which will have been set to the broker's time at this point) before returning the response to the client in the produce path. (cherry picked from commit 74b1d98)
(cherry picked from commit da36137)
WillemKauf
approved these changes
Jan 16, 2026
Collaborator
Author
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Backport of PR #29286
Fixes: #29299,