Page History

...

Enforcing the guarantee that committed offsets from the source cluster always carry an epoch lower than or equal to the destination's current epoch, so destination consumers can validate positions normally. Before appending mirrored data, the destination sets DLE = SLE + LEADER_EPOCH_BUMP_INCREMENT whenever SLE > DLE − LEADER_EPOCH_BUMP_THRESHOLD. The chosen increment is 10 and the threshold is 3, which provides a window of 7 source leader elections before the next bump. These two constants are a tradeoff: larger values mean fewer epoch bumps but faster epoch consumption, smaller values mean more bumps but slower epoch growth.

...