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What will happen to messages with null key that are already in the topic if you enable log compaction on the topic ?

vl4deee11
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  • You can find my answer to the same question [here](https://stackoverflow.com/a/67887343/10866798) – nipuna Jul 12 '21 at 09:00
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    Does this answer your question? [Kafka: What happens to message with null key when log compaction is enabled?](https://stackoverflow.com/questions/67885383/kafka-what-happens-to-message-with-null-key-when-log-compaction-is-enabled) – nipuna Jul 12 '21 at 09:01
  • No, it says what will happen when writing the null key, but I would like to know what will happen to those messages that are already in the topic – vl4deee11 Jul 12 '21 at 09:07

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According to Kafka issues page, after kafka fix version 0.9.0.0, kafka messages with null keys will be ignored(deleted) when log compaction happens.

You can read more details in here -> KAFKA-1755

nipuna
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