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package com.yahoo.vespa.hosted.provision.autoscale;
import com.yahoo.config.provision.ClusterResources;
import java.time.Instant;
import java.util.Objects;
import java.util.Optional;
/**
* An autoscaling conclusion and the context that led to it.
*
* @author bratseth
*/
public class Autoscaling {
private final Status status;
private final String description;
private final Optional<ClusterResources> resources;
private final Instant at;
private final Load peak;
private final Load ideal;
public Autoscaling(Status status, String description, Optional<ClusterResources> resources, Instant at,
Load peak, Load ideal) {
this.status = status;
this.description = description;
this.resources = resources;
this.at = at;
this.peak = peak;
this.ideal = ideal;
}
/** Returns the resource target of this, or empty if none (meaning keep the current allocation). */
public Optional<ClusterResources> resources() {
return resources;
}
public Status status() { return status; }
public String description() { return description; }
/** Returns the time this was decided. */
public Instant at() { return at; }
/** Returns the peak load seen in the period considered in this. */
public Load peak() { return peak; }
/** Returns the ideal load the cluster in question should have. */
public Load ideal() { return ideal; }
public Autoscaling with(Status status, String description) {
return new Autoscaling(status, description, resources, at, peak, ideal);
}
/** Converts this autoscaling into an ideal one at the completion of it. */
public Autoscaling asIdeal(Instant at) {
return new Autoscaling(Status.ideal,
"Cluster is ideally scaled within configured limits",
Optional.empty(),
at,
peak,
ideal);
}
@Override
public boolean equals(Object o) {
if ( ! (o instanceof Autoscaling other)) return false;
if ( ! this.status.equals(other.status)) return false;
if ( ! this.description.equals(other.description)) return false;
if ( ! this.resources.equals(other.resources)) return false;
if ( ! this.at.equals(other.at)) return false;
if ( ! this.peak.equals(other.peak)) return false;
if ( ! this.ideal.equals(other.ideal)) return false;
return true;
}
@Override
public int hashCode() {
return Objects.hash(status, description, at, peak, ideal);
}
@Override
public String toString() {
return (resources.isPresent() ? "Autoscaling to " + resources : "Don't autoscale") +
(description.isEmpty() ? "" : ": " + description);
}
public static Autoscaling empty() {
return new Autoscaling(Status.unavailable,
"",
Optional.empty(),
Instant.EPOCH,
Load.zero(),
Load.zero());
}
/** Creates an autoscaling conclusion which does not change the current allocation for a specified reason. */
public static Autoscaling dontScale(Status status, String description, ClusterModel clusterModel) {
return new Autoscaling(status,
description,
Optional.empty(),
clusterModel.at(),
clusterModel.peakLoad(),
clusterModel.idealLoad());
}
/** Creates an autoscaling conclusion to scale. */
public static Autoscaling scaleTo(ClusterResources target, ClusterModel clusterModel) {
return new Autoscaling(Status.rescaling,
"Rescaling initiated due to load changes",
Optional.of(target),
clusterModel.at(),
clusterModel.peakLoad(),
clusterModel.idealLoad());
}
public enum Status {
/** No status is available: Aautoscaling is disabled, or a brand new application. */
unavailable,
/** Autoscaling is not taking any action at the moment due to recent changes or a lack of data */
waiting,
/** The cluster is ideally scaled to the current load */
ideal,
/** The cluster should be rescaled further, but no better configuration is allowed by the current limits */
insufficient,
/** Rescaling of this cluster has been scheduled */
rescaling
};
}
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