1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;
/**
* A capacity request.
*
* @author Ulf Lilleengen
* @author bratseth
*/
public final class Capacity {
/** Resources should stay between these values, inclusive */
private final ClusterResources min, max;
private final boolean required;
private final boolean canFail;
private final NodeType type;
private Capacity(ClusterResources min, ClusterResources max, boolean required, boolean canFail, NodeType type) {
validate(min);
validate(max);
if (max.smallerThan(min))
throw new IllegalArgumentException("The max capacity must be larger than the min capacity, but got min " +
min + " and max " + max);
this.min = min;
this.max = max;
this.required = required;
this.canFail = canFail;
this.type = type;
}
private static void validate(ClusterResources resources) {
if (resources.nodes() == 0 && resources.groups() == 0) return; // unspecified
if (resources.nodes() % resources.groups() != 0)
throw new IllegalArgumentException("The number of nodes (" + resources.nodes() +
") must be divisible by the number of groups (" + resources.groups() + ")");
}
public ClusterResources minResources() { return min; }
public ClusterResources maxResources() { return max; }
/** Returns whether the requested number of nodes must be met exactly for a request for this to succeed */
public boolean isRequired() { return required; }
/**
* Returns true if an exception should be thrown if the specified capacity can not be satisfied
* (to whatever policies are applied and taking required true/false into account).
* Returns false if it is preferable to still succeed with partially satisfied capacity.
*/
public boolean canFail() { return canFail; }
/**
* Returns the node type (role) requested. This is tenant nodes by default.
* If some other type is requested the node count and flavor may be ignored
* and all nodes of the requested type returned instead.
*/
public NodeType type() { return type; }
public Capacity withLimits(ClusterResources min, ClusterResources max) {
return new Capacity(min, max, required, canFail, type);
}
@Override
public String toString() {
return (required ? "required " : "") +
(min.equals(max) ? min : "between " + min + " and " + max);
}
/** Create a non-required, failable capacity request */
public static Capacity from(ClusterResources resources) {
return from(resources, resources);
}
/** Create a non-required, failable capacity request */
public static Capacity from(ClusterResources min, ClusterResources max) {
return from(min, max, false, true);
}
public static Capacity from(ClusterResources resources, boolean required, boolean canFail) {
return from(resources, required, canFail, NodeType.tenant);
}
public static Capacity from(ClusterResources min, ClusterResources max, boolean required, boolean canFail) {
return new Capacity(min, max, required, canFail, NodeType.tenant);
}
/** Creates this from a node type */
public static Capacity fromRequiredNodeType(NodeType type) {
return from(new ClusterResources(0, 0, NodeResources.unspecified()), true, false, type);
}
private static Capacity from(ClusterResources resources, boolean required, boolean canFail, NodeType type) {
return new Capacity(resources, resources, required, canFail, type);
}
}
|
