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When remote storage is enabled on a topic, and the consumer is doing backfill, then the data is read from the remote storage. Currently, Kafka remote storage supports reading only the first remote partition in the given FETCH request (see KAFKA-14915). The default value of max.partition.fetch.bytes  is configured to 1 MB. Reading one 1 MB of data per FETCH request from remote, increases the round-trip time for the consumer and the cloud storages are often tuned to read data in chunks of 4 MB. 

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