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Add max concurrent and current queries engine metrics (#2326)

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* Add max concurrent and current queries engine metrics

This commit adds two metrics to the promql/engine: the
number of max concurrent queries, as configured by the flag, and
the number of current queries being served+blocked in the engine.
This commit is contained in:
André Carvalho 2017-01-07 12:41:25 -02:00 committed by Brian Brazil
parent f9e581907a
commit c43dfaba1c
1 changed files with 27 additions and 0 deletions
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27
promql/engine.go
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@ -21,6 +21,7 @@ import (
"sort"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/model"
"golang.org/x/net/context"
@ -31,12 +32,35 @@ import (
)
const (
namespace = "prometheus"
subsystem = "engine"
// The largest SampleValue that can be converted to an int64 without overflow.
maxInt64 model.SampleValue = 9223372036854774784
// The smallest SampleValue that can be converted to an int64 without underflow.
minInt64 model.SampleValue = -9223372036854775808
)
var (
currentQueries = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "queries",
Help: "The current number of queries being executed or waiting.",
})
maxConcurrentQueries = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "queries_concurrent_max",
Help: "The max number of concurrent queries.",
})
)
func init() {
prometheus.MustRegister(currentQueries)
prometheus.MustRegister(maxConcurrentQueries)
}
// convertibleToInt64 returns true if v does not over-/underflow an int64.
func convertibleToInt64(v model.SampleValue) bool {
return v <= maxInt64 && v >= minInt64
@ -247,6 +271,7 @@ func NewEngine(queryable Queryable, o *EngineOptions) *Engine {
if o == nil {
o = DefaultEngineOptions
}
maxConcurrentQueries.Set(float64(o.MaxConcurrentQueries))
return &Engine{
queryable: queryable,
gate: newQueryGate(o.MaxConcurrentQueries),
@ -331,6 +356,8 @@ func (ng *Engine) newTestQuery(f func(context.Context) error) Query {
// At this point per query only one EvalStmt is evaluated. Alert and record
// statements are not handled by the Engine.
func (ng *Engine) exec(ctx context.Context, q *query) (model.Value, error) {
currentQueries.Inc()
defer currentQueries.Dec()
ctx, cancel := context.WithTimeout(ctx, ng.options.Timeout)
q.cancel = cancel