Package org.cdk8s.plus24.k8s

Class TopologySpreadConstraint.Jsii$Proxy

    • Constructor Detail

      • Jsii$Proxy

        protected Jsii$Proxy​(software.amazon.jsii.JsiiObjectRef objRef)
        Constructor that initializes the object based on values retrieved from the JsiiObject.
        Parameters:
        objRef - Reference to the JSII managed object.

    • Method Detail

      • getMaxSkew

        public final Number getMaxSkew()
        Description copied from interface: TopologySpreadConstraint
        MaxSkew describes the degree to which pods may be unevenly distributed.

        When whenUnsatisfiable=DoNotSchedule, it is the maximum permitted difference between the number of matching pods in the target topology and the global minimum. The global minimum is the minimum number of matching pods in an eligible domain or zero if the number of eligible domains is less than MinDomains. For example, in a 3-zone cluster, MaxSkew is set to 1, and pods with the same labelSelector spread as 2/2/1: In this case, the global minimum is 1. | zone1 | zone2 | zone3 | | P P | P P | P | - if MaxSkew is 1, incoming pod can only be scheduled to zone3 to become 2/2/2; scheduling it onto zone1(zone2) would make the ActualSkew(3-1) on zone1(zone2) violate MaxSkew(1). - if MaxSkew is 2, incoming pod can be scheduled onto any zone. When whenUnsatisfiable=ScheduleAnyway, it is used to give higher precedence to topologies that satisfy it. It's a required field. Default value is 1 and 0 is not allowed.

        Specified by:
        getMaxSkew in interface TopologySpreadConstraint

      • getTopologyKey

        public final String getTopologyKey()
        Description copied from interface: TopologySpreadConstraint
        TopologyKey is the key of node labels.

        Nodes that have a label with this key and identical values are considered to be in the same topology. We consider each <key, value> as a "bucket", and try to put balanced number of pods into each bucket. We define a domain as a particular instance of a topology. Also, we define an eligible domain as a domain whose nodes match the node selector. e.g. If TopologyKey is "kubernetes.io/hostname", each Node is a domain of that topology. And, if TopologyKey is "topology.kubernetes.io/zone", each zone is a domain of that topology. It's a required field.

        Specified by:
        getTopologyKey in interface TopologySpreadConstraint

      • getWhenUnsatisfiable

        public final String getWhenUnsatisfiable()
        Description copied from interface: TopologySpreadConstraint
        WhenUnsatisfiable indicates how to deal with a pod if it doesn't satisfy the spread constraint.

        • DoNotSchedule (default) tells the scheduler not to schedule it. - ScheduleAnyway tells the scheduler to schedule the pod in any location, but giving higher precedence to topologies that would help reduce the skew. A constraint is considered "Unsatisfiable" for an incoming pod if and only if every possible node assignment for that pod would violate "MaxSkew" on some topology. For example, in a 3-zone cluster, MaxSkew is set to 1, and pods with the same labelSelector spread as 3/1/1: | zone1 | zone2 | zone3 | | P P P | P | P | If WhenUnsatisfiable is set to DoNotSchedule, incoming pod can only be scheduled to zone2(zone3) to become 3/2/1(3/1/2) as ActualSkew(2-1) on zone2(zone3) satisfies MaxSkew(1). In other words, the cluster can still be imbalanced, but scheduler won't make it more imbalanced. It's a required field.
        Specified by:
        getWhenUnsatisfiable in interface TopologySpreadConstraint

      • getMinDomains

        public final Number getMinDomains()
        Description copied from interface: TopologySpreadConstraint
        MinDomains indicates a minimum number of eligible domains.

        When the number of eligible domains with matching topology keys is less than minDomains, Pod Topology Spread treats "global minimum" as 0, and then the calculation of Skew is performed. And when the number of eligible domains with matching topology keys equals or greater than minDomains, this value has no effect on scheduling. As a result, when the number of eligible domains is less than minDomains, scheduler won't schedule more than maxSkew Pods to those domains. If value is nil, the constraint behaves as if MinDomains is equal to 1. Valid values are integers greater than 0. When value is not nil, WhenUnsatisfiable must be DoNotSchedule.

        For example, in a 3-zone cluster, MaxSkew is set to 2, MinDomains is set to 5 and pods with the same labelSelector spread as 2/2/2: | zone1 | zone2 | zone3 | | P P | P P | P P | The number of domains is less than 5(MinDomains), so "global minimum" is treated as 0. In this situation, new pod with the same labelSelector cannot be scheduled, because computed skew will be 3(3 - 0) if new Pod is scheduled to any of the three zones, it will violate MaxSkew.

        This is an alpha field and requires enabling MinDomainsInPodTopologySpread feature gate.

        Specified by:
        getMinDomains in interface TopologySpreadConstraint

      • $jsii$toJson

        @Internal
public com.fasterxml.jackson.databind.JsonNode $jsii$toJson()
        Specified by:
        $jsii$toJson in interface software.amazon.jsii.JsiiSerializable

      • hashCode

        public final int hashCode()
        Overrides:
        hashCode in class Object