ddl: add syntax for setting the cache step of auto id explicitly.

ddl/db_integration_test.go

@@ -16,6 +16,7 @@ package ddl_test
 import (
 	"context"
 	"fmt"
+	"strconv"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -2152,3 +2153,107 @@ func (s *testIntegrationSuite7) TestAddExpressionIndexOnPartition(c *C) {
 
 	tk.MustQuery("select * from t;").Check(testkit.Rows("1 'test' 2", "12 'test' 3", "15 'test' 10", "20 'test' 20"))
 }
+
+// TestCreateTableWithAutoIdCache test the auto_id_cache table option.
+// `auto_id_cache` take effects on handle too when `PKIshandle` is false,
+// or even there is no auto_increment column at all.
+func (s *testIntegrationSuite3) TestCreateTableWithAutoIdCache(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("USE test;")
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("drop table if exists t1;")
+
+	// Test primary key is handle.
+	tk.MustExec("create table t(a int auto_increment key) auto_id_cache 100")
+	tblInfo, err := s.dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+	c.Assert(err, IsNil)
+	c.Assert(tblInfo.Meta().AutoIdCache, Equals, int64(100))
+	tk.MustExec("insert into t values()")
+	tk.MustQuery("select * from t").Check(testkit.Rows("1"))
+	tk.MustExec("delete from t")
+
+	// Invalid the allocator cache, insert will trigger a new cache
+	tk.MustExec("rename table t to t1;")
+	tk.MustExec("insert into t1 values()")
+	tk.MustQuery("select * from t1").Check(testkit.Rows("101"))
+
+	// Test primary key is not handle.
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("drop table if exists t1;")
+	tk.MustExec("create table t(a int) auto_id_cache 100")
+	tblInfo, err = s.dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+	c.Assert(err, IsNil)
+
+	tk.MustExec("insert into t values()")
+	tk.MustQuery("select _tidb_rowid from t").Check(testkit.Rows("1"))
+	tk.MustExec("delete from t")
+
+	// Invalid the allocator cache, insert will trigger a new cache
+	tk.MustExec("rename table t to t1;")
+	tk.MustExec("insert into t1 values()")
+	tk.MustQuery("select _tidb_rowid from t1").Check(testkit.Rows("101"))
+
+	// Test both auto_increment and rowid exist.
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("drop table if exists t1;")
+	tk.MustExec("create table t(a int null, b int auto_increment unique) auto_id_cache 100")
+	tblInfo, err = s.dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+	c.Assert(err, IsNil)
+
+	tk.MustExec("insert into t(b) values(NULL)")
+	tk.MustQuery("select b, _tidb_rowid from t").Check(testkit.Rows("1 2"))
+	tk.MustExec("delete from t")
+
+	// Invalid the allocator cache, insert will trigger a new cache.
+	tk.MustExec("rename table t to t1;")
+	tk.MustExec("insert into t1(b) values(NULL)")
+	tk.MustQuery("select b, _tidb_rowid from t1").Check(testkit.Rows("101 102"))
+	tk.MustExec("delete from t1")
+
+	// Test alter auto_id_cache.
+	tk.MustExec("alter table t1 auto_id_cache 200")
+	tblInfo, err = s.dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t1"))
+	c.Assert(err, IsNil)
+	c.Assert(tblInfo.Meta().AutoIdCache, Equals, int64(200))
+
+	tk.MustExec("insert into t1(b) values(NULL)")
+	tk.MustQuery("select b, _tidb_rowid from t1").Check(testkit.Rows("201 202"))
+	tk.MustExec("delete from t1")
+
+	// Invalid the allocator cache, insert will trigger a new cache.
+	tk.MustExec("rename table t1 to t;")
+	tk.MustExec("insert into t(b) values(NULL)")
+	tk.MustQuery("select b, _tidb_rowid from t").Check(testkit.Rows("401 402"))
+	tk.MustExec("delete from t")
+
+	tk.MustExec("drop table if exists t;")
+	tk.MustExec("drop table if exists t1;")
+	tk.MustExec("create table t(a int auto_increment key) auto_id_cache 3")
+	tblInfo, err = s.dom.InfoSchema().TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
+	c.Assert(err, IsNil)
+	c.Assert(tblInfo.Meta().AutoIdCache, Equals, int64(3))
+
+	// Test insert batch size(4 here) greater than the customized autoid step(3 here).
+	tk.MustExec("insert into t(a) values(NULL),(NULL),(NULL),(NULL)")
+	tk.MustQuery("select a from t").Check(testkit.Rows("1", "2", "3", "4"))
+	tk.MustExec("delete from t")
+
+	// Invalid the allocator cache, insert will trigger a new cache.
+	tk.MustExec("rename table t to t1;")
+	tk.MustExec("insert into t1(a) values(NULL)")
+	next := tk.MustQuery("select a from t1").Rows()[0][0].(string)
+	nextInt, err := strconv.Atoi(next)
+	c.Assert(err, IsNil)
+	c.Assert(nextInt, Greater, 5)
+
+	// Test auto_id_cache overflows int64.
+	tk.MustExec("drop table if exists t;")
+	_, err = tk.Exec("create table t(a int) auto_id_cache = 9223372036854775808")
+	c.Assert(err, NotNil)
+	c.Assert(err.Error(), Equals, "table option auto_id_cache overflows int64")
+
+	tk.MustExec("create table t(a int) auto_id_cache = 9223372036854775807")
+	_, err = tk.Exec("alter table t auto_id_cache = 9223372036854775808")
+	c.Assert(err, NotNil)
+	c.Assert(err.Error(), Equals, "table option auto_id_cache overflows int64")
+}

ddl/ddl_api.go

@@ -1923,6 +1923,12 @@ func handleTableOptions(options []*ast.TableOption, tbInfo *model.TableInfo) err
 		switch op.Tp {
 		case ast.TableOptionAutoIncrement:
 			tbInfo.AutoIncID = int64(op.UintValue)
+		case ast.TableOptionAutoIdCache:
+			if op.UintValue > uint64(math.MaxInt64) {
+				// TODO: Refine this error.
+				return errors.New("table option auto_id_cache overflows int64")
+			}
+			tbInfo.AutoIdCache = int64(op.UintValue)
 		case ast.TableOptionComment:
 			tbInfo.Comment = op.StrValue
 		case ast.TableOptionCompression:
@@ -2150,6 +2156,12 @@ func (d *ddl) AlterTable(ctx sessionctx.Context, ident ast.Ident, specs []*ast.A
 					err = d.ShardRowID(ctx, ident, opt.UintValue)
 				case ast.TableOptionAutoIncrement:
 					err = d.RebaseAutoID(ctx, ident, int64(opt.UintValue))
+				case ast.TableOptionAutoIdCache:
+					if opt.UintValue > uint64(math.MaxInt64) {
+						// TODO: Refine this error.
+						return errors.New("table option auto_id_cache overflows int64")
+					}
+					err = d.AlterTableAutoIDCache(ctx, ident, int64(opt.UintValue))
 				case ast.TableOptionComment:
 					spec.Comment = opt.StrValue
 					err = d.AlterTableComment(ctx, ident, spec)
@@ -3394,6 +3406,27 @@ func (d *ddl) AlterTableComment(ctx sessionctx.Context, ident ast.Ident, spec *a
 	return errors.Trace(err)
 }
 
+// AlterTableAutoIDCache updates the table comment information.
+func (d *ddl) AlterTableAutoIDCache(ctx sessionctx.Context, ident ast.Ident, newCache int64) error {
+	schema, tb, err := d.getSchemaAndTableByIdent(ctx, ident)
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	job := &model.Job{
+		SchemaID:   schema.ID,
+		TableID:    tb.Meta().ID,
+		SchemaName: schema.Name.L,
+		Type:       model.ActionModifyTableAutoIdCache,
+		BinlogInfo: &model.HistoryInfo{},
+		Args:       []interface{}{newCache},
+	}
+
+	err = d.doDDLJob(ctx, job)
+	err = d.callHookOnChanged(err)
+	return errors.Trace(err)
+}
+
 // AlterTableCharset changes the table charset and collate.
 func (d *ddl) AlterTableCharsetAndCollate(ctx sessionctx.Context, ident ast.Ident, toCharset, toCollate string, needsOverwriteCols bool) error {
 	// use the last one.

ddl/ddl_worker.go

@@ -635,6 +635,8 @@ func (w *worker) runDDLJob(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64,
 		ver, err = w.onShardRowID(d, t, job)
 	case model.ActionModifyTableComment:
 		ver, err = onModifyTableComment(t, job)
+	case model.ActionModifyTableAutoIdCache:
+		ver, err = onModifyTableAutoIDCache(t, job)
 	case model.ActionAddTablePartition:
 		ver, err = onAddTablePartition(d, t, job)
 	case model.ActionModifyTableCharsetAndCollate:

ddl/rollingback.go

@@ -349,7 +349,7 @@ func convertJob2RollbackJob(w *worker, d *ddlCtx, t *meta.Meta, job *model.Job)
 		model.ActionModifyColumn, model.ActionAddForeignKey,
 		model.ActionDropForeignKey, model.ActionRenameTable,
 		model.ActionModifyTableCharsetAndCollate, model.ActionTruncateTablePartition,
-		model.ActionModifySchemaCharsetAndCollate, model.ActionRepairTable:
+		model.ActionModifySchemaCharsetAndCollate, model.ActionRepairTable, model.ActionModifyTableAutoIdCache:
 		ver, err = cancelOnlyNotHandledJob(job)
 	default:
 		job.State = model.JobStateCancelled

ddl/table.go

@@ -512,6 +512,27 @@ func onRebaseAutoID(store kv.Storage, t *meta.Meta, job *model.Job) (ver int64,
 	return ver, nil
 }
 
+func onModifyTableAutoIDCache(t *meta.Meta, job *model.Job) (int64, error) {
+	var cache int64
+	if err := job.DecodeArgs(&cache); err != nil {
+		job.State = model.JobStateCancelled
+		return 0, errors.Trace(err)
+	}
+
+	tblInfo, err := getTableInfoAndCancelFaultJob(t, job, job.SchemaID)
+	if err != nil {
+		return 0, errors.Trace(err)
+	}
+
+	tblInfo.AutoIdCache = cache
+	ver, err := updateVersionAndTableInfo(t, job, tblInfo, true)
+	if err != nil {
+		return ver, errors.Trace(err)
+	}
+	job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
+	return ver, nil
+}
+
 func (w *worker) onShardRowID(d *ddlCtx, t *meta.Meta, job *model.Job) (ver int64, _ error) {
 	var shardRowIDBits uint64
 	err := job.DecodeArgs(&shardRowIDBits)

executor/show.go

@@ -903,6 +903,10 @@ func ConstructResultOfShowCreateTable(ctx sessionctx.Context, tableInfo *model.T
 		}
 	}
 
+	if tableInfo.AutoIdCache != 0 {
+		fmt.Fprintf(buf, " /*T![auto_id_cache] AUTO_ID_CACHE=%d */", tableInfo.AutoIdCache)
+	}
+
 	if tableInfo.ShardRowIDBits > 0 {
 		fmt.Fprintf(buf, "/*!90000 SHARD_ROW_ID_BITS=%d ", tableInfo.ShardRowIDBits)
 		if tableInfo.PreSplitRegions > 0 {

executor/show_test.go

@@ -717,6 +717,42 @@ func (s *testAutoRandomSuite) TestShowCreateTableAutoRandom(c *C) {
 	))
 }
 
+// Override testAutoRandomSuite to test auto id cache.
+func (s *testAutoRandomSuite) TestAutoIdCache(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int auto_increment key) auto_id_cache = 10")
+	tk.MustQuery("show create table t").Check(testutil.RowsWithSep("|",
+		""+
+			"t CREATE TABLE `t` (\n"+
+			"  `a` int(11) NOT NULL AUTO_INCREMENT,\n"+
+			"  PRIMARY KEY (`a`)\n"+
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin /*T![auto_id_cache] AUTO_ID_CACHE=10 */",
+	))
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int auto_increment unique, b int key) auto_id_cache 100")
+	tk.MustQuery("show create table t").Check(testutil.RowsWithSep("|",
+		""+
+			"t CREATE TABLE `t` (\n"+
+			"  `a` int(11) NOT NULL AUTO_INCREMENT,\n"+
+			"  `b` int(11) NOT NULL,\n"+
+			"  PRIMARY KEY (`b`),\n"+
+			"  UNIQUE KEY `a` (`a`)\n"+
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin /*T![auto_id_cache] AUTO_ID_CACHE=100 */",
+	))
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(a int key) auto_id_cache 5")
+	tk.MustQuery("show create table t").Check(testutil.RowsWithSep("|",
+		""+
+			"t CREATE TABLE `t` (\n"+
+			"  `a` int(11) NOT NULL,\n"+
+			"  PRIMARY KEY (`a`)\n"+
+			") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin /*T![auto_id_cache] AUTO_ID_CACHE=5 */",
+	))
+}
+
 func (s *testSuite5) TestShowEscape(c *C) {
 	tk := testkit.NewTestKit(c, s.store)
 

go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/pingcap/goleveldb v0.0.0-20191226122134-f82aafb29989
 	github.com/pingcap/kvproto v0.0.0-20200409034505-a5af800ca2ef
 	github.com/pingcap/log v0.0.0-20200117041106-d28c14d3b1cd
-	github.com/pingcap/parser v0.0.0-20200407074807-436f1c8c4cff
+	github.com/pingcap/parser v0.0.0-20200410065024-81f3db8e6095
 	github.com/pingcap/pd/v4 v4.0.0-beta.1.0.20200305072537-61d9f9cc35d3
 	github.com/pingcap/sysutil v0.0.0-20200408114249-ed3bd6f7fdb1
 	github.com/pingcap/tidb-tools v4.0.0-beta.1.0.20200306084441-875bd09aa3d5+incompatible

go.sum

@@ -269,8 +269,8 @@ github.com/pingcap/kvproto v0.0.0-20200409034505-a5af800ca2ef/go.mod h1:IOdRDPLy
 github.com/pingcap/log v0.0.0-20191012051959-b742a5d432e9/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
 github.com/pingcap/log v0.0.0-20200117041106-d28c14d3b1cd h1:CV3VsP3Z02MVtdpTMfEgRJ4T9NGgGTxdHpJerent7rM=
 github.com/pingcap/log v0.0.0-20200117041106-d28c14d3b1cd/go.mod h1:4rbK1p9ILyIfb6hU7OG2CiWSqMXnp3JMbiaVJ6mvoY8=
-github.com/pingcap/parser v0.0.0-20200407074807-436f1c8c4cff h1:FolYHDHFe4y0WXj6A8nxnlFO4f7gRo0XYBew6JNu8Uk=
-github.com/pingcap/parser v0.0.0-20200407074807-436f1c8c4cff/go.mod h1:9v0Edh8IbgjGYW2ArJr19E+bvL8zKahsFp+ixWeId+4=
+github.com/pingcap/parser v0.0.0-20200410065024-81f3db8e6095 h1:DyL/YbS4r89FmiZd3XbUrpMSsVFtpOZzh1busGKytiI=
+github.com/pingcap/parser v0.0.0-20200410065024-81f3db8e6095/go.mod h1:9v0Edh8IbgjGYW2ArJr19E+bvL8zKahsFp+ixWeId+4=
 github.com/pingcap/pd/v4 v4.0.0-beta.1.0.20200305072537-61d9f9cc35d3 h1:Yrp99FnjHAEuDrSBql2l0IqCtJX7KwJbTsD5hIArkvk=
 github.com/pingcap/pd/v4 v4.0.0-beta.1.0.20200305072537-61d9f9cc35d3/go.mod h1:25GfNw6+Jcr9kca5rtmTb4gKCJ4jOpow2zV2S9Dgafs=
 github.com/pingcap/sysutil v0.0.0-20200206130906-2bfa6dc40bcd/go.mod h1:EB/852NMQ+aRKioCpToQ94Wl7fktV+FNnxf3CX/TTXI=

infoschema/builder.go

@@ -74,7 +74,7 @@ func (b *Builder) ApplyDiff(m *meta.Meta, diff *model.SchemaDiff) ([]int64, erro
 	// We try to reuse the old allocator, so the cached auto ID can be reused.
 	var allocs autoid.Allocators
 	if tableIDIsValid(oldTableID) {
-		if oldTableID == newTableID && diff.Type != model.ActionRenameTable && diff.Type != model.ActionRebaseAutoID {
+		if oldTableID == newTableID && diff.Type != model.ActionRenameTable && diff.Type != model.ActionRebaseAutoID && diff.Type != model.ActionModifyTableAutoIdCache {
 			allocs, _ = b.is.AllocByID(oldTableID)
 		}