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This KIP proposes an optional, topic-level feature that provides an opportunity for cost savings on remote storage when the scenario is suitable to use.

Currently, Kafka's tiered storage implementation uploads all non-active local log segments to remote storage immediately, even when they are still within the local retention period. 
This results in redundant storage of the same data in both local and remote tiers.

We can see the one redundancy example in the following picture. (just highlight one segement.)

 Whenthere is no requirement for real-time analytics or immediate consumption based on remote storage. It has the following drawbacks:

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