Flag to add active query tracker.

CHANGELOG.md

@@ -27,6 +27,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#5493](https://github.com/thanos-io/thanos/pull/5493) Compact: Added `--compact.blocks-fetch-concurrency` allowing to configure number of go routines for download blocks during compactions.
 - [#5527](https://github.com/thanos-io/thanos/pull/5527) Receive: Add per request limits for remote write.
 - [#5520](https://github.com/thanos-io/thanos/pull/5520) Receive: Meta-monitoring based active series limiting
+- [#5555](https://github.com/thanos-io/thanos/pull/5555) Query: Added `--query.active-query-path` flag, allowing the user to configure the directory to create an active query tracking file, `queries.active`, for different resolution.
 
 ### Changed
 

cmd/thanos/query.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"math"
 	"net/http"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -161,6 +162,8 @@ func registerQuery(app *extkingpin.App) {
 	enableMetricMetadataPartialResponse := cmd.Flag("metric-metadata.partial-response", "Enable partial response for metric metadata endpoint. --no-metric-metadata.partial-response for disabling.").
 		Hidden().Default("true").Bool()
 
+	activeQueryDir := cmd.Flag("query.active-query-path", "Directory to log currently active queries in the queries.active file.").Default("").String()
+
 	featureList := cmd.Flag("enable-feature", "Comma separated experimental feature names to enable.The current list of features is "+queryPushdown+".").Default("").Strings()
 
 	enableExemplarPartialResponse := cmd.Flag("exemplar.partial-response", "Enable partial response for exemplar endpoint. --no-exemplar.partial-response for disabling.").
@@ -271,6 +274,7 @@ func registerQuery(app *extkingpin.App) {
 			*enableTargetPartialResponse,
 			*enableMetricMetadataPartialResponse,
 			*enableExemplarPartialResponse,
+			*activeQueryDir,
 			fileSD,
 			time.Duration(*dnsSDInterval),
 			*dnsSDResolver,
@@ -338,6 +342,7 @@ func runQuery(
 	enableTargetPartialResponse bool,
 	enableMetricMetadataPartialResponse bool,
 	enableExemplarPartialResponse bool,
+	activeQueryDir string,
 	fileSD *file.Discovery,
 	dnsSDInterval time.Duration,
 	dnsSDResolver string,
@@ -467,6 +472,7 @@ func runQuery(
 			maxConcurrentSelects,
 			queryTimeout,
 		)
+
 		engineOpts = promql.EngineOpts{
 			Logger: logger,
 			Reg:    reg,
@@ -575,7 +581,8 @@ func runQuery(
 		grpcProbe,
 		prober.NewInstrumentation(comp, logger, extprom.WrapRegistererWithPrefix("thanos_", reg)),
 	)
-	engineCreator := engineFactory(promql.NewEngine, engineOpts, dynamicLookbackDelta)
+	engineCreator := engineFactory(promql.NewEngine, engineOpts, dynamicLookbackDelta, activeQueryDir,
+		maxConcurrentQueries, logger)
 
 	// Start query API + UI HTTP server.
 	{
@@ -735,6 +742,9 @@ func engineFactory(
 	newEngine func(promql.EngineOpts) *promql.Engine,
 	eo promql.EngineOpts,
 	dynamicLookbackDelta bool,
+	activeQueryDir string,
+	maxConcurrentQueries int,
+	logger log.Logger,
 ) func(int64) *promql.Engine {
 	resolutions := []int64{downsample.ResLevel0}
 	if dynamicLookbackDelta {
@@ -753,17 +763,27 @@ func engineFactory(
 		if ld < r {
 			lookbackDelta = time.Duration(r) * time.Millisecond
 		}
-		engines[i] = newEngine(promql.EngineOpts{
+
+		newEngineOpts := promql.EngineOpts{
 			Logger:                   eo.Logger,
 			Reg:                      wrapReg(i),
 			MaxSamples:               eo.MaxSamples,
 			Timeout:                  eo.Timeout,
-			ActiveQueryTracker:       eo.ActiveQueryTracker,
 			LookbackDelta:            lookbackDelta,
 			NoStepSubqueryIntervalFn: eo.NoStepSubqueryIntervalFn,
 			EnableAtModifier:         eo.EnableAtModifier,
 			EnableNegativeOffset:     eo.EnableNegativeOffset,
-		})
+		}
+		// An active query tracker will be added only if the user specifies a non-default path.
+		// Otherwise, the nil active query tracker from existing engine options will be used.
+		if activeQueryDir != "" {
+			resActiveQueryDir := filepath.Join(activeQueryDir, getActiveQueryDirBasedOnResolution(r))
+			newEngineOpts.ActiveQueryTracker = promql.NewActiveQueryTracker(resActiveQueryDir, maxConcurrentQueries, logger)
+		} else {
+			newEngineOpts.ActiveQueryTracker = eo.ActiveQueryTracker
+		}
+
+		engines[i] = newEngine(newEngineOpts)
 	}
 	return func(maxSourceResolutionMillis int64) *promql.Engine {
 		for i := len(resolutions) - 1; i >= 1; i-- {
@@ -778,3 +798,16 @@ func engineFactory(
 		return engines[0]
 	}
 }
+
+func getActiveQueryDirBasedOnResolution(resolution int64) string {
+	if resolution == downsample.ResLevel0 {
+		return "raw"
+	}
+	if resolution == downsample.ResLevel1 {
+		return "5m"
+	}
+	if resolution == downsample.ResLevel2 {
+		return "1h"
+	}
+	return ""
+}

cmd/thanos/query_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/go-kit/log"
 	"github.com/prometheus/prometheus/promql"
 
 	"github.com/thanos-io/thanos/pkg/testutil"
@@ -102,7 +103,8 @@ func TestEngineFactory(t *testing.T) {
 		}
 	)
 	for _, td := range tData {
-		e := engineFactory(mockNewEngine, promql.EngineOpts{LookbackDelta: td.lookbackDelta}, td.dynamicLookbackDelta)
+		e := engineFactory(mockNewEngine, promql.EngineOpts{LookbackDelta: td.lookbackDelta}, td.dynamicLookbackDelta,
+			"", 1, log.NewNopLogger())
 		for _, tc := range td.tcs {
 			got := e(tc.stepMillis)
 			testutil.Equals(t, tc.expect, got)

docs/components/query.md

@@ -246,6 +246,10 @@ Example file SD file in YAML:
   - thanos-store.infra:10901
 ```
 
+## Active Query Tracking
+
+`--query.active-query-path` is an option which allows the user to specify a directory which will contain a `queries.active` file to track active queries. To enable this feature, the user has to specify a directory other than "", since that is skipped being the default.
+
 ## Flags
 
 ```$ mdox-exec="thanos query --help"
@@ -323,6 +327,9 @@ Flags:
                                  LogStartAndFinishCall: Logs the start and
                                  finish call of the requests. NoLogCall: Disable
                                  request logging.
+      --query.active-query-path=""
+                                 Directory to log currently active queries in
+                                 the queries.active file.
       --query.auto-downsampling  Enable automatic adjustment (step / 5) to what
                                  source of data should be used in store gateways
                                  if no max_source_resolution param is specified.