Injects Dapr runtime Updates actor partition placement Pod C O N T A I N E R Sidecar Injector Pod C O N T A I N E R Operator Pod C O N T A I N E R Placement Microservice Building Blocks State Management update Invoke Actor POST http://10.0.0.6:6004/update { “speed":“1" } { “speed":“1" } Placement Service Get Actor Location Virtual Actors with Dapr Pod X Actor A Actor B Pod Y Actor C http://localhost:3500/v1.0/actors/MyActors/C/method/updateName Invoke Actor { “speed":“3" } Placement Service Get Actor Location POST http://10.0.0.7:6005/update { “speed":“3" } Actor C Allocate

Publish and subscribe State stores Resource bindings Input/output Pod C O N T A I N E R Placement Pod C O N T A I N E R Sidecar injector Pod C O N T A I N E R Operator Pod C O N T A I N E R Application code 1 Pod Update component changes to runtime Updates actor partition placement Injects Dapr runtime Components Dapr Kubernetes-hosted Sidecar architecture Component management Publish and subscribe State stores Resource bindings Input/output Pod C O N T A I N E R Placement Pod C O N T A I N E R Sidecar injector Pod C O N T A I N E R Operator Dapr API HTTP or gRPC

FuzzHandleRequest github.com/dapr/dapr/pkg/injector 3 FuzzFSMPlacementState github.com/dapr/dapr/pkg/placement/raft 4 FuzzDaprRuntime github.com/dapr/dapr/pkg/runtime 5 FuzzInvokeRemote github.com/dapr/dapr/pkg/messaging highlighted lines below: https://github.com/dapr/dapr/blob/1c95ad119a4257d1f0f1403eda0aced56c3fe848/pkg/placement/ra�/fsm. go#L145 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164