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// Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;
import java.util.Objects;
import java.util.Optional;
/**
* The node resources required by an application cluster
*
* @author bratseth
*/
public class NodeResources {
public enum DiskSpeed {
fast, // SSD disk or similar speed is needed
slow, // This is tuned to work with the speed of spinning disks
any // The performance of the cluster using this does not depend on disk speed
}
private final double vcpu;
private final double memoryGb;
private final double diskGb;
private final DiskSpeed diskSpeed;
private final boolean allocateByLegacyName;
/** The legacy (flavor) name of this, or null if none */
private final String legacyName;
/** Create node resources requiring fast disk */
public NodeResources(double vcpu, double memoryGb, double diskGb) {
this(vcpu, memoryGb, diskGb, DiskSpeed.fast);
}
public NodeResources(double vcpu, double memoryGb, double diskGb, DiskSpeed diskSpeed) {
this.vcpu = vcpu;
this.memoryGb = memoryGb;
this.diskGb = diskGb;
this.diskSpeed = diskSpeed;
this.allocateByLegacyName = false;
this.legacyName = null;
}
private NodeResources(double vcpu, double memoryGb, double diskGb, DiskSpeed diskSpeed,
boolean allocateByLegacyName, String legacyName) {
this.vcpu = vcpu;
this.memoryGb = memoryGb;
this.diskGb = diskGb;
this.diskSpeed = diskSpeed;
this.allocateByLegacyName = allocateByLegacyName;
this.legacyName = legacyName;
}
public double vcpu() { return vcpu; }
public double memoryGb() { return memoryGb; }
public double diskGb() { return diskGb; }
public DiskSpeed diskSpeed() { return diskSpeed; }
public NodeResources withDiskSpeed(DiskSpeed speed) {
return new NodeResources(vcpu, memoryGb, diskGb, speed);
}
public NodeResources withVcpu(double vcpu) {
return new NodeResources(vcpu, memoryGb, diskGb, diskSpeed);
}
public NodeResources subtract(NodeResources other) {
if ( ! this.isInterchangeableWith(other))
throw new IllegalArgumentException(this + " and " + other + " are not interchangeable");
return new NodeResources(vcpu - other.vcpu,
memoryGb - other.memoryGb,
diskGb - other.diskGb,
combine(this.diskSpeed, other.diskSpeed));
}
public NodeResources add(NodeResources other) {
if ( ! this.isInterchangeableWith(other))
throw new IllegalArgumentException(this + " and " + other + " are not interchangeable");
return new NodeResources(vcpu + other.vcpu,
memoryGb + other.memoryGb,
diskGb + other.diskGb,
combine(this.diskSpeed, other.diskSpeed));
}
/**
* If this is true, a non-docker legacy name was used to specify this and we'll respect that by mapping directly.
* The other getters of this will return 0.
*/
public boolean allocateByLegacyName() { return allocateByLegacyName; }
/** Returns the legacy name of this, or empty if none. */
public Optional<String> legacyName() {
return Optional.ofNullable(legacyName);
}
private boolean isInterchangeableWith(NodeResources other) {
if (this.allocateByLegacyName != other.allocateByLegacyName) return false;
if (this.allocateByLegacyName) return legacyName.equals(other.legacyName);
if (this.diskSpeed != DiskSpeed.any && other.diskSpeed != DiskSpeed.any && this.diskSpeed != other.diskSpeed)
return false;
return true;
}
private DiskSpeed combine(DiskSpeed a, DiskSpeed b) {
if (a == DiskSpeed.any) return b;
if (b == DiskSpeed.any) return a;
if (a == b) return a;
throw new IllegalArgumentException(a + " cannot be combined with " + b);
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if ( ! (o instanceof NodeResources)) return false;
NodeResources other = (NodeResources)o;
if (allocateByLegacyName) {
return this.legacyName.equals(other.legacyName);
}
else {
if (this.vcpu != other.vcpu) return false;
if (this.memoryGb != other.memoryGb) return false;
if (this.diskGb != other.diskGb) return false;
if (this.diskSpeed != other.diskSpeed) return false;
return true;
}
}
@Override
public int hashCode() {
if (allocateByLegacyName)
return legacyName.hashCode();
else
return (int)(2503 * vcpu + 22123 * memoryGb + 26987 * diskGb + diskSpeed.hashCode());
}
@Override
public String toString() {
if (allocateByLegacyName)
return "flavor '" + legacyName + "'";
else
return "[vcpu: " + vcpu + ", memory: " + memoryGb + " Gb, disk " + diskGb + " Gb" +
(diskSpeed != DiskSpeed.fast ? ", disk speed: " + diskSpeed : "") + "]";
}
/** Returns true if all the resources of this are the same or larger than the given resources */
public boolean satisfies(NodeResources other) {
if (this.allocateByLegacyName || other.allocateByLegacyName) // resources are not available
return Objects.equals(this.legacyName, other.legacyName);
if (this.vcpu < other.vcpu) return false;
if (this.memoryGb < other.memoryGb) return false;
if (this.diskGb < other.diskGb) return false;
// Why doesn't a fast disk satisfy a slow disk? Because if slow disk is explicitly specified
// (i.e not "any"), you should not randomly, sometimes get a faster disk as that means you may
// draw conclusions about performance on the basis of better resources than you think you have
if (other.diskSpeed != DiskSpeed.any && other.diskSpeed != this.diskSpeed) return false;
return true;
}
/** Returns true if all the resources of this are the same as or compatible with the given resources */
public boolean compatibleWith(NodeResources other) {
if (this.allocateByLegacyName || other.allocateByLegacyName) // resources are not available
return Objects.equals(this.legacyName, other.legacyName);
if (this.vcpu != other.vcpu) return false;
if (this.memoryGb != other.memoryGb) return false;
if (this.diskGb != other.diskGb) return false;
if (other.diskSpeed != DiskSpeed.any && other.diskSpeed != this.diskSpeed) return false;
return true;
}
/**
* Create this from serial form.
*
* @throws IllegalArgumentException if the given string cannot be parsed as a serial form of this
*/
public static NodeResources fromLegacyName(String flavorString) {
if (flavorString.startsWith("d-")) { // A legacy docker flavor: We still allocate by numbers
String[] parts = flavorString.split("-");
double cpu = Integer.parseInt(parts[1]);
double mem = Integer.parseInt(parts[2]);
double dsk = Integer.parseInt(parts[3]);
if (cpu == 0) cpu = 0.5;
if (cpu == 2 && mem == 8 ) cpu = 1.5;
if (cpu == 2 && mem == 12 ) cpu = 2.3;
return new NodeResources(cpu, mem, dsk, DiskSpeed.fast, false, flavorString);
}
else { // Another legacy flavor: Allocate by direct matching
return new NodeResources(0, 0, 0, DiskSpeed.fast, true, flavorString);
}
}
}
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