*: support mysql compatible auto_increment, the client side changes

ddl/schematracker/checker.go

@@ -17,6 +17,7 @@ package schematracker
 import (
 	"bytes"
 	"context"
+	"crypto/tls"
 	"fmt"
 	"strings"
 	"time"
@@ -553,15 +554,37 @@ func (d Checker) MoveJobFromTable2Queue() error {
 // StorageDDLInjector wraps kv.Storage to inject checker to domain's DDL in bootstrap time.
 type StorageDDLInjector struct {
 	kv.Storage
+	kv.EtcdBackend
 	Injector func(ddl.DDL) *Checker
 }
 
+var _ kv.EtcdBackend = StorageDDLInjector{}
+
+// EtcdAddrs implements the kv.EtcdBackend interface.
+func (s StorageDDLInjector) EtcdAddrs() ([]string, error) {
+	return s.EtcdBackend.EtcdAddrs()
+}
+
+// TLSConfig implements the kv.EtcdBackend interface.
+func (s StorageDDLInjector) TLSConfig() *tls.Config {
+	return s.EtcdBackend.TLSConfig()
+}
+
+// StartGCWorker implements the kv.EtcdBackend interface.
+func (s StorageDDLInjector) StartGCWorker() error {
+	return s.EtcdBackend.StartGCWorker()
+}
+
 // NewStorageDDLInjector creates a new StorageDDLInjector to inject Checker.
 func NewStorageDDLInjector(s kv.Storage) kv.Storage {
-	return StorageDDLInjector{
+	ret := StorageDDLInjector{
 		Storage:  s,
 		Injector: NewChecker,
 	}
+	if ebd, ok := s.(kv.EtcdBackend); ok {
+		ret.EtcdBackend = ebd
+	}
+	return ret
 }
 
 // UnwrapStorage unwraps StorageDDLInjector for one level.

infoschema/builder.go

@@ -699,7 +699,8 @@ func (b *Builder) applyCreateTable(m *meta.Meta, dbInfo *model.DBInfo, tableID i
 		tblVer := autoid.AllocOptionTableInfoVersion(tblInfo.Version)
 		switch tp {
 		case model.ActionRebaseAutoID, model.ActionModifyTableAutoIdCache:
-			newAlloc := autoid.NewAllocator(b.store, dbInfo.ID, tblInfo.ID, tblInfo.IsAutoIncColUnsigned(), autoid.RowIDAllocType, tblVer)
+			idCacheOpt := autoid.CustomAutoIncCacheOption(tblInfo.AutoIdCache)
+			newAlloc := autoid.NewAllocator(b.store, dbInfo.ID, tblInfo.ID, tblInfo.IsAutoIncColUnsigned(), autoid.RowIDAllocType, tblVer, idCacheOpt)
 			allocs = append(allocs, newAlloc)
 		case model.ActionRebaseAutoRandomBase:
 			newAlloc := autoid.NewAllocator(b.store, dbInfo.ID, tblInfo.ID, tblInfo.IsAutoRandomBitColUnsigned(), autoid.AutoRandomType, tblVer)

meta/autoid/BUILD.bazel

@@ -4,12 +4,14 @@ go_library(
     name = "autoid",
     srcs = [
         "autoid.go",
+        "autoid_service.go",
         "errors.go",
         "memid.go",
     ],
     importpath = "github.com/pingcap/tidb/meta/autoid",
     visibility = ["//visibility:public"],
     deps = [
+        "//autoid_service",
         "//errno",
         "//kv",
         "//meta",
@@ -24,8 +26,12 @@ go_library(
         "@com_github_opentracing_opentracing_go//:opentracing-go",
         "@com_github_pingcap_errors//:errors",
         "@com_github_pingcap_failpoint//:failpoint",
+        "@com_github_pingcap_kvproto//pkg/autoid",
         "@com_github_tikv_client_go_v2//txnkv/txnsnapshot",
         "@com_github_tikv_client_go_v2//util",
+        "@io_etcd_go_etcd_client_v3//:client",
+        "@org_golang_google_grpc//:grpc",
+        "@org_golang_google_grpc//credentials/insecure",
         "@org_uber_go_zap//:zap",
     ],
 )

meta/autoid/autoid.go

@@ -26,6 +26,7 @@ import (
 	"github.com/opentracing/opentracing-go"
 	"github.com/pingcap/errors"
 	"github.com/pingcap/failpoint"
+	autoid "github.com/pingcap/tidb/autoid_service"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/meta"
 	"github.com/pingcap/tidb/metrics"
@@ -38,6 +39,7 @@ import (
 	"github.com/pingcap/tidb/util/mathutil"
 	"github.com/tikv/client-go/v2/txnkv/txnsnapshot"
 	tikvutil "github.com/tikv/client-go/v2/util"
+	clientv3 "go.etcd.io/etcd/client/v3"
 	"go.uber.org/zap"
 )
 
@@ -533,6 +535,47 @@ func NextStep(curStep int64, consumeDur time.Duration) int64 {
 	return res
 }
 
+func newSinglePointAlloc(store kv.Storage, dbID, tblID int64, isUnsigned bool) *singlePointAlloc {
+	ebd, ok := store.(kv.EtcdBackend)
+	if !ok {
+		// newSinglePointAlloc fail because not etcd background
+		// This could happen in the server package unit test
+		return nil
+	}
+
+	addrs, err := ebd.EtcdAddrs()
+	if err != nil {
+		panic(err)
+	}
+	spa := &singlePointAlloc{
+		dbID:       dbID,
+		tblID:      tblID,
+		isUnsigned: isUnsigned,
+	}
+	if len(addrs) > 0 {
+		etcdCli, err := clientv3.New(clientv3.Config{
+			Endpoints: addrs,
+			TLS:       ebd.TLSConfig(),
+		})
+		if err != nil {
+			logutil.BgLogger().Error("[autoid client] fail to connect etcd, fallback to default", zap.Error(err))
+			return nil
+		}
+		spa.clientDiscover = clientDiscover{etcdCli: etcdCli}
+	} else {
+		spa.clientDiscover = clientDiscover{}
+		spa.mu.AutoIDAllocClient = autoid.MockForTest(store)
+	}
+
+	// mockAutoIDChange failpoint is not implemented in this allocator, so fallback to use the default one.
+	failpoint.Inject("mockAutoIDChange", func(val failpoint.Value) {
+		if val.(bool) {
+			spa = nil
+		}
+	})
+	return spa
+}
+
 // NewAllocator returns a new auto increment id generator on the store.
 func NewAllocator(store kv.Storage, dbID, tbID int64, isUnsigned bool,
 	allocType AllocatorType, opts ...AllocOption) Allocator {
@@ -548,6 +591,15 @@ func NewAllocator(store kv.Storage, dbID, tbID int64, isUnsigned bool,
 	for _, fn := range opts {
 		fn.ApplyOn(alloc)
 	}
+
+	// Use the MySQL compatible AUTO_INCREMENT mode.
+	if allocType == RowIDAllocType && alloc.customStep && alloc.step == 1 {
+		alloc1 := newSinglePointAlloc(store, dbID, tbID, isUnsigned)
+		if alloc1 != nil {
+			return alloc1
+		}
+	}
+
 	return alloc
 }