public void handleMaintenance(Operation maintOp){
  performPendingRequestMaintenance();
  checkAndScheduleSynchronization(this.cachedGroupState.membershipUpdateTimeMicros);
  maintOp.complete();
}

public void handleMaintenance ( Operation maintOp ) { performPendingRequestMaintenance ( ) ; checkAndScheduleSynchronization ( this . cachedGroupState . membershipUpdateTimeMicros ) ; maintOp . complete ( ) ; }
invoked by parent during its maintenance interval
