Page History

...

In BuildingRemoteLogAux state, the follower will

Option 1:

Repeatedly call the FetchEarliestOffsetFromLeader API from ELO-LE to the earliest leader epoch that the leader knows, and build local leader epoch cache accordingly. This option may not be very efficient, when there were a lot of leadership changes. The advantage of this option is that the entire process is in Kafka, even when the remote storage is temporarily unavailable, the followers can still catch up and join ISR.

Option 2:

1) Wait for RLMM to receive remote segment information, until there is a remote segment that contains the ELO-LE.

...