func (c *Resources) checkResources(cluster core.ClusterInterface, service framework.ServiceConfig) error {
requiredInstances, err := c.requiredInstances(cluster, service)
if err != nil {
return err
}
if requiredInstances == 0 {
return nil
}
slaves, err := cluster.Slaves()
if err != nil {
return err
}
allowedInstances := 0
for _, v := range slaves {
allowed := v.AllowedInstances(service.CPUShares, float64(service.Memory))
logger.Instance().Infof("Checking slave %s - Available CPU %f Mem %f - Allowed instances %d", v.Hostname, v.AvailableCpu(), v.AvailableMem(), allowed)
if allowed > 0 {
allowedInstances += allowed
}
}
if allowedInstances < requiredInstances {
return fmt.Errorf("Cluster %s doesn't have enough resources. It only accept %d instances.", cluster.Id(), allowedInstances)
}
logger.Instance().Infof("Checking Resources in cluster %s done", cluster.Id())
return nil
}
func (c *Resources) requiredInstances(cluster core.ClusterInterface, service framework.ServiceConfig) (int, error) {
requiredInstances := 0
deployedService, err := cluster.FindService(service.Namespace, service.ServiceName, service.CompatibilityVersion)
if err != nil {
return 0, err
}
if deployedService == nil {
requiredInstances = service.Instances
logger.Instance().Infof("The service is new in cluster %s, deploy needs resources for %d instances", cluster.Id(), requiredInstances)
} else if len(deployedService.Instances) == service.Instances {
requiredInstances = int(math.Max(1, math.Floor(float64(service.Instances)*0.2)))
logger.Instance().Infof("Service replacement in cluster %s, deploy needs resources for %d instances", cluster.Id(), requiredInstances)
} else if len(deployedService.Instances) < service.Instances {
requiredInstances = service.Instances - len(deployedService.Instances)
logger.Instance().Infof("Service up scale in cluster %s, deploy needs resources for %d instances", cluster.Id(), requiredInstances)
} else {
logger.Instance().Infof("Service down scale in cluster %s, the cluster should have enough resources", cluster.Id())
}
return requiredInstances, nil
}