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Consistent hashing to a subset of nodes. It works like consistent hash,

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but instead of mapping to a single node, we map to a subset of nodes.
This commit is contained in:
Diego Woitasen 2018-11-10 20:30:06 -03:00
parent 29118750be
commit 60b983503b
17 changed files with 434 additions and 17 deletions
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21
internal/ingress/annotations/upstreamhashby/main.go
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@ -27,14 +27,27 @@ type upstreamhashby struct {
r resolver.Resolver
}
// NewParser creates a new CORS annotation parser
// Config contains the Consistent hash configuration to be used in the Ingress
type Config struct {
UpstreamHashBy string `json:"upstream-hash-by,omitempty"`
UpstreamHashBySubset bool `json:"upstream-hash-by-subset,omitempty"`
UpstreamHashBySubsetSize int `json:"upstream-hash-by-subset-size,omitempty"`
}
// NewParser creates a new UpstreamHashBy annotation parser
func NewParser(r resolver.Resolver) parser.IngressAnnotation {
return upstreamhashby{r}
}
// Parse parses the annotations contained in the ingress rule
// used to indicate if the location/s contains a fragment of
// configuration to be included inside the paths of the rules
func (a upstreamhashby) Parse(ing *extensions.Ingress) (interface{}, error) {
return parser.GetStringAnnotation("upstream-hash-by", ing)
upstreamHashBy, _ := parser.GetStringAnnotation("upstream-hash-by", ing)
upstreamHashBySubset, _ := parser.GetBoolAnnotation("upstream-hash-by-subset", ing)
upstreamHashbySubsetSize, _ := parser.GetIntAnnotation("upstream-hash-by-subset-size", ing)
if upstreamHashbySubsetSize == 0 {
upstreamHashbySubsetSize = 3
}
return &Config{upstreamHashBy, upstreamHashBySubset, upstreamHashbySubsetSize}, nil
}