Page History

...

Since we added the object storage layer in the active log segment producer path, if a leader is lost, then the data that is lost is equivalent to the amount of data that is waiting to be written to object storage. This is similar to the original Kafka design where the amount of data lost is the data on the leader broker but not yet replicated to the followers. The amount of data lost  can be mitigated by uploading to object storage more frequently.

Acks=-1 / Acks=all

When the producer produces using acks=-1, the append of produce records to local log segment will not mark the completion of the message receiving, instead a DelayedProduce purgatory action will be triggered (this is the current Kafka implementation). There are two options for when to mark the produce request as successful:

...