Add timeout for trying apply_downsamplg_config lock.

Signed-off-by: Harkishen-Singh <harkishensingh@hotmail.com>

EXTENSION_VERSION

@@ -1 +1 @@
-downsampling_new_config
+feature_metric_rollup

pkg/downsample/downsample.go

@@ -8,10 +8,11 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"time"
+
 	"github.com/jackc/pgx/v4"
 
 	"github.com/timescale/promscale/pkg/internal/day"
-	"github.com/timescale/promscale/pkg/log"
 	"github.com/timescale/promscale/pkg/util"
 )
 
@@ -28,7 +29,7 @@ type Config struct {
 }
 
 func (c Config) Name() string {
-	return downsamplePrefix + day.String(c.Interval)
+	return downsamplePrefix + c.Interval.String()
 }
 
 func SetState(ctx context.Context, conn *pgx.Conn, state bool) error {
@@ -52,24 +53,35 @@ func Sync(ctx context.Context, conn *pgx.Conn, cfgs []Config) error {
 		return fmt.Errorf("error getting lock for syncing downsampling config")
 	}
 	defer pgLock.Close()
-	got, err := pgLock.GetAdvisoryLock() // To prevent failure when multiple Promscale start at the same time.
+
+	try := func() (bool, error) {
+		got, err := pgLock.GetAdvisoryLock() // To prevent failure when multiple Promscale start at the same time.
+		if err != nil {
+			return false, fmt.Errorf("error trying pg advisory_lock")
+		}
+		return got, nil
+	}
+
+	got, err := try()
 	if err != nil {
-		return fmt.Errorf("error trying pg advisory_lock")
+		return err
 	}
 	if !got {
-		// Some other Promscale instance is already working on the downsampling.Sync()
-		// Hence, we should skip.
-		return nil
-	}
-	defer func() {
-		if _, err = pgLock.Unlock(); err != nil {
-			log.Error("msg", "error unlocking downsampling.Sync advisory_lock", "err", err.Error())
+		// Wait for sometime and try again. If we still did not get the lock, throw an error.
+		time.Sleep(time.Second * 5)
+		got, err = try()
+		if err != nil {
+			return err
+		}
+		if !got {
+			return fmt.Errorf("timeout: unable to take the advisory lock for syncing downsampling state")
 		}
-	}()
+	}
+
 	var applyCfgs []cfgWithName
 	for i := range cfgs {
 		c := cfgs[i]
-		applyCfgs = append(applyCfgs, cfgWithName{Name: c.Name(), Interval: day.String(c.Interval), Retention: day.String(c.Retention)})
+		applyCfgs = append(applyCfgs, cfgWithName{Name: c.Name(), Interval: c.Interval.String(), Retention: c.Retention.String()})
 	}
 	if len(applyCfgs) > 0 {
 		str, err := json.Marshal(applyCfgs)

pkg/internal/day/duration.go

@@ -16,6 +16,7 @@ import (
 const (
 	dayUnit                 = 'd'
 	unknownUnitDErrorPrefix = `time: unknown unit "d"`
+	day                     = int64(time.Hour * 24)
 )
 
 // Duration acts like a time.Duration with support for "d" unit
@@ -69,7 +70,29 @@ func handleDays(s []byte) (time.Duration, error) {
 
 // String returns a string value of DayDuration.
 func (d Duration) String() string {
-	return time.Duration(d).String()
+	remainder := int64(d)
+	days := remainder / day
+	remainder = remainder % day
+	hours := remainder / int64(time.Hour)
+	remainder = remainder % int64(time.Hour)
+	mins := remainder / int64(time.Minute)
+	remainder = remainder % int64(time.Minute)
+	secs := remainder / int64(time.Second)
+
+	display := ""
+	if days != 0 {
+		display = fmt.Sprintf("%dd", days)
+	}
+	if hours != 0 {
+		display = fmt.Sprintf("%s%dh", display, hours)
+	}
+	if mins != 0 {
+		display = fmt.Sprintf("%s%dm", display, mins)
+	}
+	if secs != 0 {
+		display = fmt.Sprintf("%s%ds", display, secs)
+	}
+	return display
 }
 
 // StringToDayDurationHookFunc returns a mapstructure.DecodeHookFunc that
@@ -96,32 +119,3 @@ func StringToDayDurationHookFunc() mapstructure.DecodeHookFunc {
 		return d, nil
 	}
 }
-
-// String returns the output in form of days:hours:mins:secs
-func String(d Duration) string {
-	const day = int64(time.Hour * 24)
-
-	remainder := int64(d)
-	days := remainder / day
-	remainder = remainder % day
-	hours := remainder / int64(time.Hour)
-	remainder = remainder % int64(time.Hour)
-	mins := remainder / int64(time.Minute)
-	remainder = remainder % int64(time.Minute)
-	secs := remainder / int64(time.Second)
-
-	display := ""
-	if days != 0 {
-		display = fmt.Sprintf("%dd", days)
-	}
-	if hours != 0 {
-		display = fmt.Sprintf("%s%dh", display, hours)
-	}
-	if mins != 0 {
-		display = fmt.Sprintf("%s%dm", display, mins)
-	}
-	if secs != 0 {
-		display = fmt.Sprintf("%s%ds", display, secs)
-	}
-	return display
-}

pkg/internal/day/duration_test.go

@@ -45,7 +45,7 @@ func TestString(t *testing.T) {
 		t.Run(tc.in, func(t *testing.T) {
 			var d Duration
 			require.NoError(t, d.UnmarshalText([]byte(tc.in)))
-			require.Equal(t, tc.out, String(d))
+			require.Equal(t, tc.out, d.String())
 		})
 	}
 }

pkg/tests/constants.go

@@ -18,5 +18,5 @@ func init() {
 
 	PromscaleExtensionVersion = strings.TrimSpace(string(content))
 	PromscaleExtensionContainer = "ghcr.io/timescale/dev_promscale_extension:" + PromscaleExtensionVersion + "-ts2-pg14"
-	PromscaleExtensionContainer = "local/dev_promscale_extension:head-ts2-pg14" // This will be removed once the PR against master is made.
+	//PromscaleExtensionContainer = "local/dev_promscale_extension:head-ts2-pg14" // This will be removed once the PR against master is made.
 }

pkg/tests/end_to_end_tests/continuous_agg_test.go

@@ -43,7 +43,7 @@ func TestContinuousAggDownsampling(t *testing.T) {
 	}{
 		{
 			name:    "Query non-existant column, empty result",
-			query:   `cagg{__column__="nonexistant"}`,
+			query:   `cagg{__schema__="cagg_schema",__column__="nonexistant"}`,
 			startMs: startTime,
 			endMs:   endTime,
 			stepMs:  360 * 1000,
@@ -78,7 +78,7 @@ func TestContinuousAggDownsampling(t *testing.T) {
 		},
 		{
 			name:    "Query max column",
-			query:   `cagg{__column__="max",instance="1"}`,
+			query:   `cagg{__schema__="cagg_schema",__column__="max",instance="1"}`,
 			startMs: startTime,
 			endMs:   startTime + 4*3600*1000 - 1, // -1ms to exclude fifth value
 			stepMs:  3600 * 1000,
@@ -104,7 +104,7 @@ func TestContinuousAggDownsampling(t *testing.T) {
 		},
 		{
 			name:    "Query min column",
-			query:   `cagg{__column__="min",instance="1"}`,
+			query:   `cagg{__schema__="cagg_schema",__column__="min",instance="1"}`,
 			startMs: startTime,
 			endMs:   startTime + 4*3600*1000 - 1, // -1ms to exclude fifth value
 			stepMs:  3600 * 1000,
@@ -130,7 +130,7 @@ func TestContinuousAggDownsampling(t *testing.T) {
 		},
 		{
 			name:    "Query avg column",
-			query:   `cagg{__column__="avg",instance="1"}`,
+			query:   `cagg{__schema__="cagg_schema",__column__="avg",instance="1"}`,
 			startMs: startTime,
 			endMs:   startTime + 4*3600*1000 - 1, // -1ms to exclude fifth value
 			stepMs:  3600 * 1000,

pkg/tests/end_to_end_tests/telemetry_test.go

@@ -288,8 +288,8 @@ func TestTelemetrySQLStats(t *testing.T) {
 		require.NoError(t, engine.Sync())
 
 		err = conn.QueryRow(context.Background(), "SELECT value FROM _timescaledb_catalog.metadata WHERE key = 'promscale_metrics_total' AND value IS NOT NULL").Scan(&metrics)
-		require.NoError(t, err)
-		require.Equal(t, "0", metrics) // Without promscale_extension, this will give error saying "no rows in result set".
+		require.NoError(t, err) // Without promscale_extension, this will give error saying "no rows in result set".
+		require.Equal(t, "0", metrics)
 
 		// Add dummy metric.
 		_, err = conn.Exec(context.Background(), "SELECT _prom_catalog.create_metric_table('test_metric')")