# autoCreateTopics problems in k2k kafka replication configuration for MSK Serverless **URL:** \ **Category:** K2K\ **Created:** [July 24, 2025, 11:26am UTC](https://ask.lenses.io/t/autocreatetopics-problems-in-k2k-kafka-replication-configuration-for-msk-serverless/406 "2025-07-24T11:26:41Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![Carlos\_Teixeira](https://dub1.discourse-cdn.com/flex017/user_avatar/ask.lenses.io/carlos_teixeira/32/198_2.png) [@Carlos\_Teixeira](https://ask.lenses.io/u/Carlos_Teixeira)\ **Post date:** [July 30, 2025, 3:21pm UTC](https://ask.lenses.io/t/autocreatetopics-problems-in-k2k-kafka-replication-configuration-for-msk-serverless/406/5 "2025-07-30T15:21:55Z")
Hi James, Thank you for trying K2K and going through the trouble of filling this report. My name is Carlos and I’m working directly on the K2K development. So, in a nutshell, it seems like when using MSK, some topic properties are added that are non standard (`partition.size.max.bytes`). Additionally it also seems like MSK does not allow updating some properties like `file.delete.delay.ms` . The current way K2K works is that we use the Apache `KafkaAdminClient` and when we attempt to auto-create a topic, we simply read the topic’s properties from your source cluster and we attempt to create one with the same properties in the target. It seems however that the `KafkaAdminClient` will happily read the non-standard properties but fails when attempting to apply them. There are two possible workarounds at the moment: - manually create the target cluster topic ahead of time - repeat the process done before (setting `replication.common.config.”prop”` to **null** ) with all properties that are causing an issue . This should make these not be sent to the target cluster In the meantime we’re actively working and iterating on K2K so we should have a way to better address this issue soon. --- _[View the full topic](https://ask.lenses.io/t/autocreatetopics-problems-in-k2k-kafka-replication-configuration-for-msk-serverless/406)._