resource_control: bypass some internal urgent request

internal/client/client_interceptor.go

@@ -107,6 +107,12 @@ func buildResourceControlInterceptor(
 	// Build the interceptor.
 	interceptFn := func(next interceptor.RPCInterceptorFunc) interceptor.RPCInterceptorFunc {
 		return func(target string, req *tikvrpc.Request) (*tikvrpc.Response, error) {
+			// bypass some internal requests and it's may influence user experience. For example, the
+			// request of `alter user password`, totally bypasses the resource control. it's not cost
+			// many resources, but it's may influence the user experience.
+			if reqInfo.Bypass() {
+				return next(target, req)
+			}
 			consumption, penalty, err := resourceControlInterceptor.OnRequestWait(ctx, resourceGroupName, reqInfo)
 			if err != nil {
 				return nil, err

internal/resourcecontrol/resource_control.go

@@ -16,12 +16,14 @@ package resourcecontrol
 
 import (
 	"reflect"
+	"strings"
 	"time"
 
 	"github.com/pingcap/kvproto/pkg/coprocessor"
 	"github.com/pingcap/kvproto/pkg/kvrpcpb"
 	"github.com/tikv/client-go/v2/internal/logutil"
 	"github.com/tikv/client-go/v2/tikvrpc"
+	"github.com/tikv/client-go/v2/util"
 	"go.uber.org/zap"
 )
 
@@ -34,12 +36,22 @@ type RequestInfo struct {
 	writeBytes    int64
 	storeID       uint64
 	replicaNumber int64
+	// bypass indicates whether the request should be bypassed.
+	// some internal request should be bypassed, such as Privilege request.
+	bypass bool
 }
 
 // MakeRequestInfo extracts the relevant information from a BatchRequest.
 func MakeRequestInfo(req *tikvrpc.Request) *RequestInfo {
+	var bypass bool
+	requestSource := req.Context.GetRequestSource()
+	if len(requestSource) > 0 {
+		if strings.Contains(requestSource, util.InternalRequest+util.InternalTxnOthers) {
+			bypass = true
+		}
+	}
 	if !req.IsTxnWriteRequest() && !req.IsRawWriteRequest() {
-		return &RequestInfo{writeBytes: -1}
+		return &RequestInfo{writeBytes: -1, storeID: req.Context.Peer.StoreId, bypass: bypass}
 	}
 
 	var writeBytes int64
@@ -57,7 +69,7 @@ func MakeRequestInfo(req *tikvrpc.Request) *RequestInfo {
 			writeBytes += int64(len(k))
 		}
 	}
-	return &RequestInfo{writeBytes: writeBytes, storeID: req.Context.Peer.StoreId, replicaNumber: req.ReplicaNumber}
+	return &RequestInfo{writeBytes: writeBytes, storeID: req.Context.Peer.StoreId, replicaNumber: req.ReplicaNumber, bypass: bypass}
 }
 
 // IsWrite returns whether the request is a write request.
@@ -68,13 +80,21 @@ func (req *RequestInfo) IsWrite() bool {
 // WriteBytes returns the actual write size of the request,
 // -1 will be returned if it's not a write request.
 func (req *RequestInfo) WriteBytes() uint64 {
-	return uint64(req.writeBytes)
+	if req.writeBytes > 0 {
+		return uint64(req.writeBytes)
+	}
+	return 0
 }
 
 func (req *RequestInfo) ReplicaNumber() int64 {
 	return req.replicaNumber
 }
 
+// Bypass returns whether the request should be bypassed.
+func (req *RequestInfo) Bypass() bool {
+	return req.bypass
+}
+
 func (req *RequestInfo) StoreID() uint64 {
 	return req.storeID
 }

internal/resourcecontrol/resource_control_test.go

@@ -0,0 +1,40 @@
+package resourcecontrol
+
+import (
+	"testing"
+
+	"github.com/pingcap/kvproto/pkg/kvrpcpb"
+	"github.com/pingcap/kvproto/pkg/metapb"
+	"github.com/stretchr/testify/assert"
+	"github.com/tikv/client-go/v2/tikvrpc"
+)
+
+func TestMakeRequestInfo(t *testing.T) {
+	// Test a non-write request.
+	req := &tikvrpc.Request{Req: &kvrpcpb.BatchGetRequest{}, Context: kvrpcpb.Context{Peer: &metapb.Peer{StoreId: 1}}}
+	info := MakeRequestInfo(req)
+	assert.False(t, info.IsWrite())
+	assert.Equal(t, uint64(0), info.WriteBytes())
+	assert.False(t, info.Bypass())
+	assert.Equal(t, uint64(1), info.StoreID())
+
+	// Test a prewrite request.
+	mutation := &kvrpcpb.Mutation{Key: []byte("foo"), Value: []byte("bar")}
+	prewriteReq := &kvrpcpb.PrewriteRequest{Mutations: []*kvrpcpb.Mutation{mutation}, PrimaryLock: []byte("baz")}
+	req = &tikvrpc.Request{Type: tikvrpc.CmdPrewrite, Req: prewriteReq, ReplicaNumber: 1, Context: kvrpcpb.Context{Peer: &metapb.Peer{StoreId: 2}}}
+	requestSource := "xxx_internal_others"
+	req.Context.RequestSource = requestSource
+	info = MakeRequestInfo(req)
+	assert.True(t, info.IsWrite())
+	assert.Equal(t, uint64(9), info.WriteBytes())
+	assert.True(t, info.Bypass())
+	assert.Equal(t, uint64(2), info.StoreID())
+	// Test a commit request.
+	commitReq := &kvrpcpb.CommitRequest{Keys: [][]byte{[]byte("qux")}}
+	req = &tikvrpc.Request{Type: tikvrpc.CmdCommit, Req: commitReq, ReplicaNumber: 2, Context: kvrpcpb.Context{Peer: &metapb.Peer{StoreId: 3}}}
+	info = MakeRequestInfo(req)
+	assert.True(t, info.IsWrite())
+	assert.Equal(t, uint64(3), info.WriteBytes())
+	assert.False(t, info.Bypass())
+	assert.Equal(t, uint64(3), info.StoreID())
+}