querysharding

package

v0.31.0-rc.1 Latest Latest Go to latest Published: Mar 13, 2023 License: Apache-2.0 Imports: 3 Imported by: 4

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type Analyzer interface {
	Analyze(string) (QueryAnalysis, error)
}

type CachedQueryAnalyzer struct {
	// contains filtered or unexported fields
}

func NewQueryAnalyzer() *CachedQueryAnalyzer

NewQueryAnalyzer creates a new QueryAnalyzer.

func (a *CachedQueryAnalyzer) Analyze(query string) (QueryAnalysis, error)

type QueryAnalysis struct {
	// contains filtered or unexported fields
}

func (q *QueryAnalysis) IsShardable() bool

func (q *QueryAnalysis) ShardBy() bool

func (q *QueryAnalysis) ShardingLabels() []string

type QueryAnalyzer struct{}

QueryAnalyzer is an analyzer which determines whether a PromQL Query is shardable and using which labels.

func (a *QueryAnalyzer) Analyze(query string) (QueryAnalysis, error)

Analyze uses the following algorithm:

if a query has functions which cannot be sharded such as label_join or label_replace, then treat the query as non shardable.
Walk the query and find the least common labelset used in grouping expressions. If non-empty, treat the query as shardable by those labels.
otherwise, treat the query as non-shardable.

The le label is excluded from sharding.