Add scheduler name support - [Update #990] (#1226)

* Add ability to specify alternative schedulers via schedulerName.

Co-authored-by: micah.coletti@gmail.com <micah.coletti@gmail.com>

charts/postgres-operator/crds/postgresqls.yaml

@@ -354,6 +354,8 @@ spec:
                       memory:
                         type: string
                         pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
+              schedulerName:
+                type: string
               serviceAnnotations:
                 type: object
                 additionalProperties:

docs/reference/cluster_manifest.md

@@ -65,6 +65,10 @@ These parameters are grouped directly under  the `spec` key in the manifest.
   custom Docker image that overrides the **docker_image** operator parameter.
   It should be a [Spilo](https://github.com/zalando/spilo) image. Optional.
 
+* **schedulerName**
+  specifies the scheduling profile for database pods. If no value is provided
+  K8s' `default-scheduler` will be used. Optional.
+
 * **spiloRunAsUser**
   sets the user ID which should be used in the container to run the process.
   This must be set to run the container without root. By default the container

manifests/postgresql.crd.yaml

@@ -350,6 +350,8 @@ spec:
                       memory:
                         type: string
                         pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
+              schedulerName:
+                type: string
               serviceAnnotations:
                 type: object
                 additionalProperties:

pkg/apis/acid.zalan.do/v1/crds.go

@@ -535,6 +535,9 @@ var PostgresCRDResourceValidation = apiextv1.CustomResourceValidation{
 							},
 						},
 					},
+					"schedulerName": {
+						Type: "string",
+					},
 					"serviceAnnotations": {
 						Type: "object",
 						AdditionalProperties: &apiextv1.JSONSchemaPropsOrBool{

pkg/apis/acid.zalan.do/v1/postgresql_type.go

@@ -60,6 +60,7 @@ type PostgresSpec struct {
 	ClusterName           string                      `json:"-"`
 	Databases             map[string]string           `json:"databases,omitempty"`
 	PreparedDatabases     map[string]PreparedDatabase `json:"preparedDatabases,omitempty"`
+	SchedulerName         *string                     `json:"schedulerName,omitempty"`
 	Tolerations           []v1.Toleration             `json:"tolerations,omitempty"`
 	Sidecars              []Sidecar                   `json:"sidecars,omitempty"`
 	InitContainers        []v1.Container              `json:"initContainers,omitempty"`

pkg/apis/acid.zalan.do/v1/zz_generated.deepcopy.go

@@ -687,6 +687,11 @@ func (in *PostgresSpec) DeepCopyInto(out *PostgresSpec) {
 			(*in)[i].DeepCopyInto(&(*out)[i])
 		}
 	}
+	if in.SchedulerName != nil {
+		in, out := &in.SchedulerName, &out.SchedulerName
+		*out = new(string)
+		**out = **in
+	}
 	return
 }
 

pkg/cluster/k8sres.go

@@ -537,6 +537,7 @@ func (c *Cluster) generatePodTemplate(
 	spiloRunAsGroup *int64,
 	spiloFSGroup *int64,
 	nodeAffinity *v1.Affinity,
+	schedulerName *string,
 	terminateGracePeriod int64,
 	podServiceAccountName string,
 	kubeIAMRole string,
@@ -575,6 +576,10 @@ func (c *Cluster) generatePodTemplate(
 		SecurityContext:               &securityContext,
 	}
 
+	if schedulerName != nil {
+		podSpec.SchedulerName = *schedulerName
+	}
+
 	if shmVolume != nil && *shmVolume {
 		addShmVolume(&podSpec)
 	}
@@ -1184,6 +1189,7 @@ func (c *Cluster) generateStatefulSet(spec *acidv1.PostgresSpec) (*appsv1.Statef
 		effectiveRunAsGroup,
 		effectiveFSGroup,
 		nodeAffinity(c.OpConfig.NodeReadinessLabel),
+		spec.SchedulerName,
 		int64(c.OpConfig.PodTerminateGracePeriod.Seconds()),
 		c.OpConfig.PodServiceAccountName,
 		c.OpConfig.KubeIAMRole,
@@ -1885,6 +1891,7 @@ func (c *Cluster) generateLogicalBackupJob() (*batchv1beta1.CronJob, error) {
 		nil,
 		nil,
 		nodeAffinity(c.OpConfig.NodeReadinessLabel),
+		nil,
 		int64(c.OpConfig.PodTerminateGracePeriod.Seconds()),
 		c.OpConfig.PodServiceAccountName,
 		c.OpConfig.KubeIAMRole,