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table.go
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table.go
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// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package ddl
import (
"fmt"
"github.com/juju/errors"
"github.com/pingcap/tidb/ddl/util"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/meta"
"github.com/pingcap/tidb/meta/autoid"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/tablecodec"
log "github.com/sirupsen/logrus"
)
func (d *ddl) onCreateTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
schemaID := job.SchemaID
tbInfo := &model.TableInfo{}
if err := job.DecodeArgs(tbInfo); err != nil {
// Invalid arguments, cancel this job.
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tbInfo.State = model.StateNone
err := checkTableNotExists(t, job, schemaID, tbInfo.Name.L)
if err != nil {
return ver, errors.Trace(err)
}
ver, err = updateSchemaVersion(t, job)
if err != nil {
return ver, errors.Trace(err)
}
switch tbInfo.State {
case model.StateNone:
// none -> public
tbInfo.State = model.StatePublic
err = t.CreateTable(schemaID, tbInfo)
if err != nil {
return ver, errors.Trace(err)
}
if EnableSplitTableRegion {
err = d.splitTableRegion(tbInfo.ID)
// It will be automatically splitting by TiKV later.
if err != nil {
log.Warnf("[ddl] split table region failed %v", err)
}
}
// Finish this job.
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tbInfo)
d.asyncNotifyEvent(&util.Event{Tp: model.ActionCreateTable, TableInfo: tbInfo})
return ver, nil
default:
return ver, ErrInvalidTableState.Gen("invalid table state %v", tbInfo.State)
}
}
func (d *ddl) onDropTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
schemaID := job.SchemaID
tableID := job.TableID
// Check this table's database.
tblInfo, err := t.GetTable(schemaID, tableID)
if err != nil {
if meta.ErrDBNotExists.Equal(err) {
job.State = model.JobStateCancelled
return ver, errors.Trace(infoschema.ErrDatabaseNotExists.GenByArgs(
fmt.Sprintf("(Schema ID %d)", schemaID),
))
}
return ver, errors.Trace(err)
}
// Check the table.
if tblInfo == nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(infoschema.ErrTableNotExists.GenByArgs(
fmt.Sprintf("(Schema ID %d)", schemaID),
fmt.Sprintf("(Table ID %d)", tableID),
))
}
originalState := job.SchemaState
switch tblInfo.State {
case model.StatePublic:
// public -> write only
job.SchemaState = model.StateWriteOnly
tblInfo.State = model.StateWriteOnly
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != tblInfo.State)
case model.StateWriteOnly:
// write only -> delete only
job.SchemaState = model.StateDeleteOnly
tblInfo.State = model.StateDeleteOnly
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != tblInfo.State)
case model.StateDeleteOnly:
tblInfo.State = model.StateNone
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != tblInfo.State)
if err != nil {
return ver, errors.Trace(err)
}
if err = t.DropTable(job.SchemaID, tableID, true); err != nil {
break
}
// Finish this job.
job.FinishTableJob(model.JobStateDone, model.StateNone, ver, tblInfo)
startKey := tablecodec.EncodeTablePrefix(tableID)
job.Args = append(job.Args, startKey)
default:
err = ErrInvalidTableState.Gen("invalid table state %v", tblInfo.State)
}
return ver, errors.Trace(err)
}
func (d *ddl) splitTableRegion(tableID int64) error {
type splitableStore interface {
SplitRegion(splitKey kv.Key) error
}
store, ok := d.store.(splitableStore)
if !ok {
return nil
}
tableStartKey := tablecodec.GenTablePrefix(tableID)
if err := store.SplitRegion(tableStartKey); err != nil {
return errors.Trace(err)
}
return nil
}
func (d *ddl) getTable(schemaID int64, tblInfo *model.TableInfo) (table.Table, error) {
alloc := autoid.NewAllocator(d.store, tblInfo.GetDBID(schemaID))
tbl, err := table.TableFromMeta(alloc, tblInfo)
return tbl, errors.Trace(err)
}
func getTableInfo(t *meta.Meta, job *model.Job, schemaID int64) (*model.TableInfo, error) {
tableID := job.TableID
tblInfo, err := t.GetTable(schemaID, tableID)
if err != nil {
if meta.ErrDBNotExists.Equal(err) {
job.State = model.JobStateCancelled
return nil, errors.Trace(infoschema.ErrDatabaseNotExists.GenByArgs(
fmt.Sprintf("(Schema ID %d)", schemaID),
))
}
return nil, errors.Trace(err)
} else if tblInfo == nil {
job.State = model.JobStateCancelled
return nil, errors.Trace(infoschema.ErrTableNotExists.GenByArgs(
fmt.Sprintf("(Schema ID %d)", schemaID),
fmt.Sprintf("(Table ID %d)", tableID),
))
}
if tblInfo.State != model.StatePublic {
job.State = model.JobStateCancelled
return nil, ErrInvalidTableState.Gen("table %s is not in public, but %s", tblInfo.Name, tblInfo.State)
}
return tblInfo, nil
}
// onTruncateTable delete old table meta, and creates a new table identical to old table except for table ID.
// As all the old data is encoded with old table ID, it can not be accessed any more.
// A background job will be created to delete old data.
func (d *ddl) onTruncateTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
schemaID := job.SchemaID
tableID := job.TableID
var newTableID int64
err := job.DecodeArgs(&newTableID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo, err := getTableInfo(t, job, schemaID)
if err != nil {
return ver, errors.Trace(err)
}
err = t.DropTable(schemaID, tblInfo.ID, true)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo.ID = newTableID
err = t.CreateTable(schemaID, tblInfo)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
ver, err = updateSchemaVersion(t, job)
if err != nil {
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
startKey := tablecodec.EncodeTablePrefix(tableID)
job.Args = []interface{}{startKey}
return ver, nil
}
func (d *ddl) onRebaseAutoID(t *meta.Meta, job *model.Job) (ver int64, _ error) {
schemaID := job.SchemaID
var newBase int64
err := job.DecodeArgs(&newBase)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo, err := getTableInfo(t, job, schemaID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo.AutoIncID = newBase
tbl, err := d.getTable(schemaID, tblInfo)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
// The operation of the minus 1 to make sure that the current value doesn't be used,
// the next Alloc operation will get this value.
// Its behavior is consistent with MySQL.
err = tbl.RebaseAutoID(nil, tblInfo.AutoIncID-1, false)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
ver, err = updateVersionAndTableInfo(t, job, tblInfo, true)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
return ver, nil
}
func (d *ddl) onShardRowID(t *meta.Meta, job *model.Job) (ver int64, _ error) {
var shardRowIDBits uint64
err := job.DecodeArgs(&shardRowIDBits)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo, err := getTableInfo(t, job, job.SchemaID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo.ShardRowIDBits = shardRowIDBits
ver, err = updateVersionAndTableInfo(t, job, tblInfo, true)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
return ver, nil
}
func (d *ddl) onRenameTable(t *meta.Meta, job *model.Job) (ver int64, _ error) {
var oldSchemaID int64
var tableName model.CIStr
if err := job.DecodeArgs(&oldSchemaID, &tableName); err != nil {
// Invalid arguments, cancel this job.
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo, err := getTableInfo(t, job, oldSchemaID)
if err != nil {
return ver, errors.Trace(err)
}
var baseID int64
shouldDelAutoID := false
newSchemaID := job.SchemaID
if newSchemaID != oldSchemaID {
shouldDelAutoID = true
err = checkTableNotExists(t, job, newSchemaID, tblInfo.Name.L)
if err != nil {
return ver, errors.Trace(err)
}
baseID, err = t.GetAutoTableID(tblInfo.GetDBID(oldSchemaID), tblInfo.ID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
// It's compatible with old version.
// TODO: Remove it.
tblInfo.OldSchemaID = 0
}
err = t.DropTable(oldSchemaID, tblInfo.ID, shouldDelAutoID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
tblInfo.Name = tableName
err = t.CreateTable(newSchemaID, tblInfo)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
// Update the table's auto-increment ID.
if newSchemaID != oldSchemaID {
_, err = t.GenAutoTableID(newSchemaID, tblInfo.ID, baseID)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
}
ver, err = updateSchemaVersion(t, job)
if err != nil {
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
return ver, nil
}
func checkTableNotExists(t *meta.Meta, job *model.Job, schemaID int64, tableName string) error {
// Check this table's database.
tables, err := t.ListTables(schemaID)
if err != nil {
if meta.ErrDBNotExists.Equal(err) {
job.State = model.JobStateCancelled
return infoschema.ErrDatabaseNotExists.GenByArgs("")
}
return errors.Trace(err)
}
// Check the table.
for _, tbl := range tables {
if tbl.Name.L == tableName {
// This table already exists and can't be created, we should cancel this job now.
job.State = model.JobStateCancelled
return infoschema.ErrTableExists.GenByArgs(tbl.Name)
}
}
return nil
}
// updateVersionAndTableInfo updates the schema version and the table information.
func updateVersionAndTableInfo(t *meta.Meta, job *model.Job, tblInfo *model.TableInfo, shouldUpdateVer bool) (
ver int64, err error) {
if shouldUpdateVer {
ver, err = updateSchemaVersion(t, job)
if err != nil {
return 0, errors.Trace(err)
}
}
return ver, t.UpdateTable(job.SchemaID, tblInfo)
}