workload/changefeed: add more logs

Author: wenyihu6

pkg/workload/changefeeds/BUILD.bazel

@@ -7,6 +7,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/util/hlc",
+        "//pkg/util/log",
         "//pkg/util/timeutil",
         "//pkg/workload",
         "//pkg/workload/histogram",

pkg/workload/changefeeds/changefeeds.go

@@ -13,13 +13,16 @@ import (
 	"time"
 
 	"github.com/cockroachdb/cockroach/pkg/util/hlc"
+	"github.com/cockroachdb/cockroach/pkg/util/log"
 	"github.com/cockroachdb/cockroach/pkg/util/timeutil"
 	"github.com/cockroachdb/cockroach/pkg/workload"
 	"github.com/cockroachdb/cockroach/pkg/workload/histogram"
 	"github.com/cockroachdb/errors"
 	"github.com/jackc/pgx/v5"
 )
 
+var logResolvedEvery = log.Every(10 * time.Second)
+
 // AddChangefeedToQueryLoad augments the passed QueryLoad to contain an extra
 // worker to run a changefeed over the tables of the generator.
 func AddChangefeedToQueryLoad(
@@ -122,10 +125,18 @@ func AddChangefeedToQueryLoad(
 		return true
 	}
 	var rows pgx.Rows
+	var changefeedStartTime time.Time
 	maybeSetupRows := func() (done bool) {
 		if rows != nil {
 			return false
 		}
+		if changefeedStartTime.IsZero() {
+			changefeedStartTime = timeutil.Now()
+		}
+		log.Dev.Infof(ctx, "creating changefeed with stmt: %s with args %v", stmt, args)
+		if epoch, err := hlc.ParseHLC(cursorStr); err == nil {
+			log.Dev.Infof(ctx, "starting a changefeed after %s", timeutil.Since(epoch.GoTime()))
+		}
 		var err error
 		rows, err = conn.Query(cfCtx, stmt, args...)
 		return maybeMarkDone(err)
@@ -169,6 +180,11 @@ func AddChangefeedToQueryLoad(
 					return errors.Errorf("resolved timestamp %s is less than last resolved timestamp %s", resolved, lastResolved)
 				}
 				lastResolved = resolved
+				if !lastResolved.IsEmpty() {
+					if logResolvedEvery.ShouldLog() {
+						log.Dev.Infof(ctx, "received resolved timestamp: lag=%s, ts=%s, sinceStart=%s", timeutil.Since(lastResolved.GoTime()), lastResolved, timeutil.Since(changefeedStartTime))
+					}
+				}
 			} else {
 				return errors.Errorf("failed to parse CHANGEFEED event: %s", values[2])
 			}