statistics: reduce the log output (pingcap#57184)

ref pingcap#55906

pkg/statistics/handle/autoanalyze/priorityqueue/BUILD.bazel

@@ -31,6 +31,7 @@ go_library(
         "//pkg/statistics/handle/util",
         "//pkg/util",
         "//pkg/util/intest",
+        "//pkg/util/logutil",
         "//pkg/util/timeutil",
         "@com_github_pingcap_errors//:errors",
         "@com_github_tikv_client_go_v2//oracle",

pkg/statistics/handle/autoanalyze/priorityqueue/queue.go

@@ -32,6 +32,7 @@ import (
 	statsutil "github.com/pingcap/tidb/pkg/statistics/handle/util"
 	"github.com/pingcap/tidb/pkg/util"
 	"github.com/pingcap/tidb/pkg/util/intest"
+	"github.com/pingcap/tidb/pkg/util/logutil"
 	"go.uber.org/zap"
 )
 
@@ -43,6 +44,12 @@ const (
 	mustRetryJobRequeueInterval         = time.Minute * 5
 )
 
+// If the process takes longer than this threshold, we will log it as a slow log.
+const slowLogThreshold = 150 * time.Millisecond
+
+// Every 15 minutes, at most 1 log will be output.
+var queueSamplerLogger = logutil.SampleLoggerFactory(15*time.Minute, 1, zap.String(logutil.LogFieldCategory, "stats"))
+
 // pqHeap is an interface that wraps the methods of a priority queue heap.
 type pqHeap interface {
 	// getByKey returns the job by the given table ID.
@@ -312,13 +319,13 @@ func (pq *AnalysisPriorityQueue) run() {
 			statslogutil.StatsLogger().Info("Priority queue stopped")
 			return
 		case <-dmlChangesFetchInterval.C:
-			statslogutil.StatsLogger().Info("Start to fetch DML changes of jobs")
+			queueSamplerLogger().Info("Start to fetch DML changes of tables")
 			pq.ProcessDMLChanges()
 		case <-timeRefreshInterval.C:
-			statslogutil.StatsLogger().Info("Start to refresh last analysis durations of jobs")
+			queueSamplerLogger().Info("Start to refresh last analysis durations of jobs")
 			pq.RefreshLastAnalysisDuration()
 		case <-mustRetryJobRequeueInterval.C:
-			statslogutil.StatsLogger().Info("Start to request must retry jobs")
+			queueSamplerLogger().Info("Start to requeue must retry jobs")
 			pq.RequeueMustRetryJobs()
 		}
 	}
@@ -334,7 +341,10 @@ func (pq *AnalysisPriorityQueue) ProcessDMLChanges() {
 	if err := statsutil.CallWithSCtx(pq.statsHandle.SPool(), func(sctx sessionctx.Context) error {
 		start := time.Now()
 		defer func() {
-			statslogutil.StatsLogger().Info("DML changes processed", zap.Duration("duration", time.Since(start)))
+			duration := time.Since(start)
+			if duration > slowLogThreshold {
+				queueSamplerLogger().Info("DML changes processed", zap.Duration("duration", duration))
+			}
 		}()
 
 		parameters := exec.GetAutoAnalyzeParameters(sctx)
@@ -609,7 +619,10 @@ func (pq *AnalysisPriorityQueue) RequeueMustRetryJobs() {
 	if err := statsutil.CallWithSCtx(pq.statsHandle.SPool(), func(sctx sessionctx.Context) error {
 		start := time.Now()
 		defer func() {
-			statslogutil.StatsLogger().Info("Must retry jobs requeued", zap.Duration("duration", time.Since(start)))
+			duration := time.Since(start)
+			if duration > slowLogThreshold {
+				queueSamplerLogger().Info("Must retry jobs requeued", zap.Duration("duration", duration))
+			}
 		}()
 
 		is := sctx.GetDomainInfoSchema().(infoschema.InfoSchema)
@@ -642,7 +655,10 @@ func (pq *AnalysisPriorityQueue) RefreshLastAnalysisDuration() {
 	if err := statsutil.CallWithSCtx(pq.statsHandle.SPool(), func(sctx sessionctx.Context) error {
 		start := time.Now()
 		defer func() {
-			statslogutil.StatsLogger().Info("Last analysis duration refreshed", zap.Duration("duration", time.Since(start)))
+			duration := time.Since(start)
+			if duration > slowLogThreshold {
+				queueSamplerLogger().Info("Last analysis duration refreshed", zap.Duration("duration", duration))
+			}
 		}()
 		jobs := pq.syncFields.inner.list()
 		currentTs, err := statsutil.GetStartTS(sctx)

pkg/statistics/handle/autoanalyze/priorityqueue/queue_ddl_handler_test.go

@@ -518,7 +518,7 @@ func TestExchangeTablePartition(t *testing.T) {
 	testKit.MustExec("analyze table t2")
 	require.NoError(t, h.Update(context.Background(), do.InfoSchema()))
 	// Insert some data.
-	testKit.MustExec("insert into t1 values (1,2),(2,2)")
+	testKit.MustExec("insert into t1 values (1,2),(2,2),(3,3),(4,4)")
 	testKit.MustExec("insert into t2 values (1,2)")
 	require.NoError(t, h.DumpStatsDeltaToKV(true))
 	require.NoError(t, h.Update(context.Background(), do.InfoSchema()))