client-go: attach request source with retry info for coprocessor (pin…

…gcap#46509) (pingcap#46706)

close pingcap#46514

DEPS.bzl

@@ -3703,8 +3703,8 @@ def go_deps():
         name = "com_github_tikv_client_go_v2",
         build_file_proto_mode = "disable_global",
         importpath = "github.com/tikv/client-go/v2",
-        sum = "h1:xL9X0pr5wZn8onnW6i98sf7KjaZmk0OIQnDhW1z+hRQ=",
-        version = "v2.0.4-0.20230817162610-e5fe1779769d",
+        sum = "h1:2W6QJ+Dh8SreeR4Z3xHXZLwdhIf1FHQwoMNBBBTn5Jg=",
+        version = "v2.0.4-0.20230905091602-cf19ede9ecd6",
     )
     go_repository(
         name = "com_github_tikv_pd_client",

go.mod

@@ -90,7 +90,7 @@ require (
 	github.com/stretchr/testify v1.8.0
 	github.com/tdakkota/asciicheck v0.1.1
 	github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
-	github.com/tikv/client-go/v2 v2.0.4-0.20230817162610-e5fe1779769d
+	github.com/tikv/client-go/v2 v2.0.4-0.20230905091602-cf19ede9ecd6
 	github.com/tikv/pd/client v0.0.0-20230904040343-947701a32c05
 	github.com/timakin/bodyclose v0.0.0-20210704033933-f49887972144
 	github.com/twmb/murmur3 v1.1.3

go.sum

@@ -935,8 +935,8 @@ github.com/tenntenn/text/transform v0.0.0-20200319021203-7eef512accb3 h1:f+jULpR
 github.com/tenntenn/text/transform v0.0.0-20200319021203-7eef512accb3/go.mod h1:ON8b8w4BN/kE1EOhwT0o+d62W65a6aPw1nouo9LMgyY=
 github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2 h1:mbAskLJ0oJfDRtkanvQPiooDH8HvJ2FBh+iKT/OmiQQ=
 github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2/go.mod h1:2PfKggNGDuadAa0LElHrByyrz4JPZ9fFx6Gs7nx7ZZU=
-github.com/tikv/client-go/v2 v2.0.4-0.20230817162610-e5fe1779769d h1:xL9X0pr5wZn8onnW6i98sf7KjaZmk0OIQnDhW1z+hRQ=
-github.com/tikv/client-go/v2 v2.0.4-0.20230817162610-e5fe1779769d/go.mod h1:mmVCLP2OqWvQJPOIevQPZvGphzh/oq9vv8J5LDfpadQ=
+github.com/tikv/client-go/v2 v2.0.4-0.20230905091602-cf19ede9ecd6 h1:2W6QJ+Dh8SreeR4Z3xHXZLwdhIf1FHQwoMNBBBTn5Jg=
+github.com/tikv/client-go/v2 v2.0.4-0.20230905091602-cf19ede9ecd6/go.mod h1:mmVCLP2OqWvQJPOIevQPZvGphzh/oq9vv8J5LDfpadQ=
 github.com/tikv/pd/client v0.0.0-20230904040343-947701a32c05 h1:e4hLUKfgfPeJPZwOfU+/I/03G0sn6IZqVcbX/5o+hvM=
 github.com/tikv/pd/client v0.0.0-20230904040343-947701a32c05/go.mod h1:MLIl+d2WbOF4A3U88WKtyXrQQW417wZDDvBcq2IW9bQ=
 github.com/timakin/bodyclose v0.0.0-20210704033933-f49887972144 h1:kl4KhGNsJIbDHS9/4U9yQo1UcPQM0kOMJHn29EoH/Ro=

session/session.go

@@ -4164,9 +4164,8 @@ func (s *session) setRequestSource(ctx context.Context, stmtLabel string, stmtNo
 	if !s.isInternal() {
 		if txn, _ := s.Txn(false); txn != nil && txn.Valid() {
 			txn.SetOption(kv.RequestSourceType, stmtLabel)
-		} else {
-			s.sessionVars.RequestSourceType = stmtLabel
 		}
+		s.sessionVars.RequestSourceType = stmtLabel
 		return
 	}
 	if source := ctx.Value(kv.RequestSourceKey); source != nil {

store/copr/coprocessor.go

@@ -269,6 +269,8 @@ type copTask struct {
 	RowCountHint     int // used for extra concurrency of small tasks, -1 for unknown row count
 	batchTaskList    map[uint64]*batchedCopTask
 	meetLockFallback bool
+	// firstReadType is used to indicate the type of first read when retrying.
+	firstReadType string
 }
 
 type batchedCopTask struct {
@@ -1015,8 +1017,12 @@ func (worker *copIteratorWorker) handleTaskOnce(bo *Backoffer, task *copTask, ch
 		RecordTimeStat: true,
 		RecordScanStat: true,
 		TaskId:         worker.req.TaskID,
-		RequestSource:  task.requestSource.GetRequestSource(),
 	})
+	req.InputRequestSource = task.requestSource.GetRequestSource()
+	if task.firstReadType != "" {
+		req.ReadType = task.firstReadType
+		req.IsRetryRequest = true
+	}
 	if worker.req.ResourceGroupTagger != nil {
 		worker.req.ResourceGroupTagger(req)
 	}
@@ -1062,12 +1068,19 @@ func (worker *copIteratorWorker) handleTaskOnce(bo *Backoffer, task *copTask, ch
 		tidbmetrics.DistSQLCoprRespBodySize.WithLabelValues(storeAddr).Observe(float64(len(copResp.Data)))
 	}
 
+	var remains []*copTask
 	if worker.req.Paging.Enable {
-		return worker.handleCopPagingResult(bo, rpcCtx, &copResponse{pbResp: copResp}, cacheKey, cacheValue, task, ch, costTime)
+		remains, err = worker.handleCopPagingResult(bo, rpcCtx, &copResponse{pbResp: copResp}, cacheKey, cacheValue, task, ch, costTime)
+	} else {
+		// Handles the response for non-paging copTask.
+		remains, err = worker.handleCopResponse(bo, rpcCtx, &copResponse{pbResp: copResp}, cacheKey, cacheValue, task, ch, nil, costTime)
 	}
-
-	// Handles the response for non-paging copTask.
-	return worker.handleCopResponse(bo, rpcCtx, &copResponse{pbResp: copResp}, cacheKey, cacheValue, task, ch, nil, costTime)
+	if req.ReadType != "" {
+		for _, remain := range remains {
+			remain.firstReadType = req.ReadType
+		}
+	}
+	return remains, err
 }
 
 const (