[RPC] Define RPC call to notify backend of Task completion.

rpc/protos/erdos_scheduler.proto

@@ -44,6 +44,9 @@ service SchedulerService {
  /// This RPC is invoked periodically by the framework along with the current timestamp
  /// and the backend scheduler informs the framework about the current allocations.
  rpc GetPlacements(GetPlacementsRequest) returns (GetPlacementsResponse) {}
+
+ /// Notifies the Scheduler that a Task from a particular TaskGraph has completed.option
+ rpc NotifyTaskCompletion(NotifyTaskCompletionRequest) returns (NotifyTaskCompletionResponse) {}
 }
 
 
@@ -147,6 +150,17 @@ message RegisterEnvironmentReadyResponse {
  string message = 2;
 }
 
+message NotifyTaskCompletionRequest {
+ string app_id = 1;
+ uint32 task_id = 2;
+ uint64 timestamp = 3;
+}
+
+message NotifyTaskCompletionResponse {
+ bool success = 1;
+ string message = 2;
+}
+
 /// Worker related RPC structures.
 /// The following structures represent the data that a Worker's addition to the
 /// framework must pass to the scheduling backend. This may involve things like