# Why Kafka retention.ms can delay message deletion

DevFeed: [Why Kafka retention.ms can delay message deletion](<https://devfeed.tech/articles/why-your-kafka-topic-ignores-retention-ms-and-how-to-fix-it-31403.md>)

Original publisher: [Read original article](<https://developers.redhat.com/articles/2026/09/16/why-your-kafka-topic-ignores-retentionms-and-how-fix-it>)

Author: Rogerio Santos

Published: 2026-09-16T13:05:06Z

Content type: tutorial

Language: en

Sources: [Red Hat](<https://devfeed.tech/sources/red-hat.md>), [Red Hat Developer](<https://devfeed.tech/sources/red-hat-developer.md>)

Topics: [Kafka](<https://devfeed.tech/topics/kafka.md>), [Apache-Kafka](<https://devfeed.tech/topics/apache-kafka.md>), [configuration](<https://devfeed.tech/topics/configuration.md>), [file](<https://devfeed.tech/topics/file.md>), [Event-Streaming](<https://devfeed.tech/topics/event-streaming.md>)

Tags: [broker](<https://devfeed.tech/tags/broker.md>), [configuration](<https://devfeed.tech/tags/configuration.md>), [diagnose](<https://devfeed.tech/tags/diagnose.md>), [event-driven](<https://devfeed.tech/tags/event-driven.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [kafka](<https://devfeed.tech/tags/kafka.md>), [lifecycle](<https://devfeed.tech/tags/lifecycle.md>), [retention](<https://devfeed.tech/tags/retention.md>), [storage](<https://devfeed.tech/tags/storage.md>), [stream-processing](<https://devfeed.tech/tags/stream-processing.md>)

## AI overview

This guide explains why Kafka messages can remain readable beyond a topic's retention.ms setting. Kafka deletes closed log segments rather than individual messages, and the active segment and continuous writes can delay removal of older records.

## Source excerpt

A customer opened a support case with a deceptively simple complaint: a Kafka topic was configured with a 12-hour retention (retention.ms), yet messages produced on July 24 were still readable 4 days later, on July 28. Nothing was broken. The broker logged no errors. The retention policy was working as designed, but the segment layout and continuous write pattern delayed when the old records could actually be removed. The post Why your Kafka topic ignores retention.ms (and how to fix it) appeared first on Red Hat Developer.