Page History

Broker A (Leader)

Broker B (stoppedstarted, follower)

Remote Storage

RL metadata storage

6: msg 8 LE-2

leader_epochs

LE-0, 0

LE-2, 5

1. Broker B fetches offset 0, and receives OMRS error. 

2. Broker B receives ELO=6, LE-2

3. in BuildingRemoteLogAux state, broker B finds seg-4-5 has LE-2. So, it builds local LE cache from seg-4-5:

leader_epochs

LE-0, 0

LE-2, 5

4. Broker B continue fetching from local messages from 6, LE-2

5. Broker B joins ISR

seg-0-3

log:

0: msg 0 LE-0

1: msg 1 LE-0

2: msg 2 LE-0

3: msg 3 LE-0

epoch:

LE-0, 0

seg-0-3

0: msg 0 LE-0

1: msg 1 LE-0

2: msg 4 LE-1

3: msg 5 LE-1

epoch:

LE-0, 0

LE-1, 2

seg-4-5

epoch:

LE-0, 0

LE-2, 5

seg-0-3, uuid1

segment epochs

LE-0, 0

seg-0-3, uuid2

segment epochs

LE-0, 0

LE-1, 2

seg-4-5, uuid3

segment epochs

LE-0, 0

LE-2, 5