@startuml
skinparam componentStyle rectangle
skinparam shadowing false
top to bottom direction

rectangle "Old Partition P(A..Z)" as OLD
rectangle "New Partition P1(A..M)" as P1
rectangle "New Partition P2(N..Z)" as P2
rectangle "WriteRouteMap" as WR
rectangle "ReadRouteMap (transition)" as RR1
rectangle "ReadRouteMap (final)" as RR2
rectangle "Background split / drain" as BG
rectangle "New stable segments" as NS

WR --> P1
WR --> P2

OLD --> BG : DRAINING
BG --> NS

RR1 --> P1
RR1 --> P2
RR1 --> OLD

NS --> RR2
P1 --> RR2
P2 --> RR2

@enduml