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index.go
executable file
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index.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 (
"context"
"math"
"strconv"
"sync/atomic"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/parser/ast"
"github.com/pingcap/parser/charset"
"github.com/pingcap/parser/model"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/config"
ddlutil "github.com/pingcap/tidb/ddl/util"
"github.com/pingcap/tidb/expression"
"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/metrics"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/store/tikv"
"github.com/pingcap/tidb/store/tikv/oracle"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/table/tables"
"github.com/pingcap/tidb/tablecodec"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/logutil"
decoder "github.com/pingcap/tidb/util/rowDecoder"
"github.com/pingcap/tidb/util/timeutil"
"go.uber.org/zap"
)
const (
// MaxCommentLength is exported for testing.
MaxCommentLength = 1024
)
func buildIndexColumns(columns []*model.ColumnInfo, indexPartSpecifications []*ast.IndexPartSpecification) ([]*model.IndexColumn, error) {
// Build offsets.
idxParts := make([]*model.IndexColumn, 0, len(indexPartSpecifications))
var col *model.ColumnInfo
// The sum of length of all index columns.
sumLength := 0
for _, ip := range indexPartSpecifications {
col = model.FindColumnInfo(columns, ip.Column.Name.L)
if col == nil {
return nil, errKeyColumnDoesNotExits.GenWithStack("column does not exist: %s", ip.Column.Name)
}
if err := checkIndexColumn(col, ip); err != nil {
return nil, err
}
indexColumnLength, err := getIndexColumnLength(col, ip.Length)
if err != nil {
return nil, err
}
sumLength += indexColumnLength
// The sum of all lengths must be shorter than the max length for prefix.
if sumLength > config.GetGlobalConfig().MaxIndexLength {
return nil, errTooLongKey.GenWithStackByArgs(config.GetGlobalConfig().MaxIndexLength)
}
idxParts = append(idxParts, &model.IndexColumn{
Name: col.Name,
Offset: col.Offset,
Length: ip.Length,
})
}
return idxParts, nil
}
func checkPKOnGeneratedColumn(tblInfo *model.TableInfo, indexPartSpecifications []*ast.IndexPartSpecification) (*model.ColumnInfo, error) {
var lastCol *model.ColumnInfo
for _, colName := range indexPartSpecifications {
lastCol = getColumnInfoByName(tblInfo, colName.Column.Name.L)
if lastCol == nil {
return nil, errKeyColumnDoesNotExits.GenWithStackByArgs(colName.Column.Name)
}
// Virtual columns cannot be used in primary key.
if lastCol.IsGenerated() && !lastCol.GeneratedStored {
return nil, ErrUnsupportedOnGeneratedColumn.GenWithStackByArgs("Defining a virtual generated column as primary key")
}
}
return lastCol, nil
}
func checkIndexPrefixLength(columns []*model.ColumnInfo, idxColumns []*model.IndexColumn) error {
// The sum of length of all index columns.
sumLength := 0
for _, ic := range idxColumns {
col := model.FindColumnInfo(columns, ic.Name.L)
if col == nil {
return errKeyColumnDoesNotExits.GenWithStack("column does not exist: %s", ic.Name)
}
indexColumnLength, err := getIndexColumnLength(col, ic.Length)
if err != nil {
return err
}
sumLength += indexColumnLength
// The sum of all lengths must be shorter than the max length for prefix.
if sumLength > config.GetGlobalConfig().MaxIndexLength {
return errTooLongKey.GenWithStackByArgs(config.GetGlobalConfig().MaxIndexLength)
}
}
return nil
}
func checkIndexColumn(col *model.ColumnInfo, ic *ast.IndexPartSpecification) error {
if col.Flen == 0 && (types.IsTypeChar(col.FieldType.Tp) || types.IsTypeVarchar(col.FieldType.Tp)) {
return errors.Trace(errWrongKeyColumn.GenWithStackByArgs(ic.Column.Name))
}
// JSON column cannot index.
if col.FieldType.Tp == mysql.TypeJSON {
return errors.Trace(errJSONUsedAsKey.GenWithStackByArgs(col.Name.O))
}
// Length must be specified and non-zero for BLOB and TEXT column indexes.
if types.IsTypeBlob(col.FieldType.Tp) {
if ic.Length == types.UnspecifiedLength {
return errors.Trace(errBlobKeyWithoutLength.GenWithStackByArgs(col.Name.O))
}
if ic.Length == types.ErrorLength {
return errors.Trace(errKeyPart0.GenWithStackByArgs(col.Name.O))
}
}
// Length can only be specified for specifiable types.
if ic.Length != types.UnspecifiedLength && !types.IsTypePrefixable(col.FieldType.Tp) {
return errors.Trace(errIncorrectPrefixKey)
}
// Key length must be shorter or equal to the column length.
if ic.Length != types.UnspecifiedLength &&
types.IsTypeChar(col.FieldType.Tp) {
if col.Flen < ic.Length {
return errors.Trace(errIncorrectPrefixKey)
}
// Length must be non-zero for char.
if ic.Length == types.ErrorLength {
return errors.Trace(errKeyPart0.GenWithStackByArgs(col.Name.O))
}
}
// Specified length must be shorter than the max length for prefix.
if ic.Length > config.GetGlobalConfig().MaxIndexLength {
return errTooLongKey.GenWithStackByArgs(config.GetGlobalConfig().MaxIndexLength)
}
return nil
}
// getIndexColumnLength calculate the bytes number required in an index column.
func getIndexColumnLength(col *model.ColumnInfo, colLen int) (int, error) {
length := types.UnspecifiedLength
if colLen != types.UnspecifiedLength {
length = colLen
} else if col.Flen != types.UnspecifiedLength {
length = col.Flen
}
switch col.Tp {
case mysql.TypeBit:
return (length + 7) >> 3, nil
case mysql.TypeVarchar, mysql.TypeString:
// Different charsets occupy different numbers of bytes on each character.
desc, err := charset.GetCharsetDesc(col.Charset)
if err != nil {
return 0, errUnsupportedCharset.GenWithStackByArgs(col.Charset, col.Collate)
}
return desc.Maxlen * length, nil
case mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeBlob, mysql.TypeLongBlob:
return length, nil
case mysql.TypeTiny, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeDouble, mysql.TypeShort:
return mysql.DefaultLengthOfMysqlTypes[col.Tp], nil
case mysql.TypeFloat:
if length <= mysql.MaxFloatPrecisionLength {
return mysql.DefaultLengthOfMysqlTypes[mysql.TypeFloat], nil
}
return mysql.DefaultLengthOfMysqlTypes[mysql.TypeDouble], nil
case mysql.TypeDecimal, mysql.TypeNewDecimal:
return calcBytesLengthForDecimal(length), nil
case mysql.TypeYear, mysql.TypeDate, mysql.TypeDuration, mysql.TypeDatetime, mysql.TypeTimestamp:
return mysql.DefaultLengthOfMysqlTypes[col.Tp], nil
default:
return length, nil
}
}
// Decimal using a binary format that packs nine decimal (base 10) digits into four bytes.
func calcBytesLengthForDecimal(m int) int {
return (m / 9 * 4) + ((m%9)+1)/2
}
func buildIndexInfo(tblInfo *model.TableInfo, indexName model.CIStr, indexPartSpecifications []*ast.IndexPartSpecification, state model.SchemaState) (*model.IndexInfo, error) {
if err := checkTooLongIndex(indexName); err != nil {
return nil, errors.Trace(err)
}
idxColumns, err := buildIndexColumns(tblInfo.Columns, indexPartSpecifications)
if err != nil {
return nil, errors.Trace(err)
}
// Create index info.
idxInfo := &model.IndexInfo{
Name: indexName,
Columns: idxColumns,
State: state,
}
return idxInfo, nil
}
func addIndexColumnFlag(tblInfo *model.TableInfo, indexInfo *model.IndexInfo) {
if indexInfo.Primary {
for _, col := range indexInfo.Columns {
tblInfo.Columns[col.Offset].Flag |= mysql.PriKeyFlag
}
return
}
col := indexInfo.Columns[0]
if indexInfo.Unique && len(indexInfo.Columns) == 1 {
tblInfo.Columns[col.Offset].Flag |= mysql.UniqueKeyFlag
} else {
tblInfo.Columns[col.Offset].Flag |= mysql.MultipleKeyFlag
}
}
func dropIndexColumnFlag(tblInfo *model.TableInfo, indexInfo *model.IndexInfo) {
if indexInfo.Primary {
for _, col := range indexInfo.Columns {
tblInfo.Columns[col.Offset].Flag &= ^mysql.PriKeyFlag
}
} else if indexInfo.Unique && len(indexInfo.Columns) == 1 {
tblInfo.Columns[indexInfo.Columns[0].Offset].Flag &= ^mysql.UniqueKeyFlag
} else {
tblInfo.Columns[indexInfo.Columns[0].Offset].Flag &= ^mysql.MultipleKeyFlag
}
col := indexInfo.Columns[0]
// other index may still cover this col
for _, index := range tblInfo.Indices {
if index.Name.L == indexInfo.Name.L {
continue
}
if index.Columns[0].Name.L != col.Name.L {
continue
}
addIndexColumnFlag(tblInfo, index)
}
}
func validateRenameIndex(from, to model.CIStr, tbl *model.TableInfo) (ignore bool, err error) {
if fromIdx := tbl.FindIndexByName(from.L); fromIdx == nil {
return false, errors.Trace(infoschema.ErrKeyNotExists.GenWithStackByArgs(from.O, tbl.Name))
}
// Take case-sensitivity into account, if `FromKey` and `ToKey` are the same, nothing need to be changed
if from.O == to.O {
return true, nil
}
// If spec.FromKey.L == spec.ToKey.L, we operate on the same index(case-insensitive) and change its name (case-sensitive)
// e.g: from `inDex` to `IndEX`. Otherwise, we try to rename an index to another different index which already exists,
// that's illegal by rule.
if toIdx := tbl.FindIndexByName(to.L); toIdx != nil && from.L != to.L {
return false, errors.Trace(infoschema.ErrKeyNameDuplicate.GenWithStackByArgs(toIdx.Name.O))
}
return false, nil
}
func onRenameIndex(t *meta.Meta, job *model.Job) (ver int64, _ error) {
tblInfo, from, to, err := checkRenameIndex(t, job)
if err != nil || tblInfo == nil {
return ver, errors.Trace(err)
}
idx := tblInfo.FindIndexByName(from.L)
idx.Name = to
if ver, err = updateVersionAndTableInfo(t, job, tblInfo, true); err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
return ver, nil
}
func validateAlterIndexVisibility(indexName model.CIStr, invisible bool, tbl *model.TableInfo) (bool, error) {
if idx := tbl.FindIndexByName(indexName.L); idx == nil {
return false, errors.Trace(infoschema.ErrKeyNotExists.GenWithStackByArgs(indexName.O, tbl.Name))
} else if idx.Invisible == invisible {
return true, nil
}
return false, nil
}
func onAlterIndexVisibility(t *meta.Meta, job *model.Job) (ver int64, _ error) {
tblInfo, from, invisible, err := checkAlterIndexVisibility(t, job)
if err != nil || tblInfo == nil {
return ver, errors.Trace(err)
}
idx := tblInfo.FindIndexByName(from.L)
idx.Invisible = invisible
if ver, err = updateVersionAndTableInfoWithCheck(t, job, tblInfo, true); err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
return ver, nil
}
func getNullColInfos(tblInfo *model.TableInfo, indexInfo *model.IndexInfo) ([]*model.ColumnInfo, error) {
nullCols := make([]*model.ColumnInfo, 0, len(indexInfo.Columns))
for _, colName := range indexInfo.Columns {
col := model.FindColumnInfo(tblInfo.Columns, colName.Name.L)
if !mysql.HasNotNullFlag(col.Flag) || mysql.HasPreventNullInsertFlag(col.Flag) {
nullCols = append(nullCols, col)
}
}
return nullCols, nil
}
func checkPrimaryKeyNotNull(w *worker, sqlMode mysql.SQLMode, t *meta.Meta, job *model.Job,
tblInfo *model.TableInfo, indexInfo *model.IndexInfo) (warnings []string, err error) {
if !indexInfo.Primary {
return nil, nil
}
dbInfo, err := checkSchemaExistAndCancelNotExistJob(t, job)
if err != nil {
return nil, err
}
nullCols, err := getNullColInfos(tblInfo, indexInfo)
if err != nil {
return nil, err
}
if len(nullCols) == 0 {
return nil, nil
}
err = modifyColsFromNull2NotNull(w, dbInfo, tblInfo, nullCols, model.NewCIStr(""), false)
if err == nil {
return nil, nil
}
_, err = convertAddIdxJob2RollbackJob(t, job, tblInfo, indexInfo, err)
// TODO: Support non-strict mode.
// warnings = append(warnings, ErrWarnDataTruncated.GenWithStackByArgs(oldCol.Name.L, 0).Error())
return nil, err
}
func updateHiddenColumns(tblInfo *model.TableInfo, idxInfo *model.IndexInfo, state model.SchemaState) {
for _, col := range idxInfo.Columns {
if tblInfo.Columns[col.Offset].Hidden {
tblInfo.Columns[col.Offset].State = state
}
}
}
func (w *worker) onCreateIndex(d *ddlCtx, t *meta.Meta, job *model.Job, isPK bool) (ver int64, err error) {
// Handle the rolling back job.
if job.IsRollingback() {
ver, err = onDropIndex(t, job)
if err != nil {
return ver, errors.Trace(err)
}
return ver, nil
}
// Handle normal job.
schemaID := job.SchemaID
tblInfo, err := getTableInfoAndCancelFaultJob(t, job, schemaID)
if err != nil {
return ver, errors.Trace(err)
}
var (
unique bool
indexName model.CIStr
indexPartSpecifications []*ast.IndexPartSpecification
indexOption *ast.IndexOption
sqlMode mysql.SQLMode
warnings []string
hiddenCols []*model.ColumnInfo
)
if isPK {
// Notice: sqlMode and warnings is used to support non-strict mode.
err = job.DecodeArgs(&unique, &indexName, &indexPartSpecifications, &indexOption, &sqlMode, &warnings)
} else {
err = job.DecodeArgs(&unique, &indexName, &indexPartSpecifications, &indexOption, &hiddenCols)
}
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
indexInfo := tblInfo.FindIndexByName(indexName.L)
if indexInfo != nil && indexInfo.State == model.StatePublic {
job.State = model.JobStateCancelled
err = ErrDupKeyName.GenWithStack("index already exist %s", indexName)
if isPK {
err = infoschema.ErrMultiplePriKey
}
return ver, err
}
for _, hiddenCol := range hiddenCols {
columnInfo := model.FindColumnInfo(tblInfo.Columns, hiddenCol.Name.L)
if columnInfo != nil && columnInfo.State == model.StatePublic {
// We already have a column with the same column name.
job.State = model.JobStateCancelled
// TODO: refine the error message
return ver, infoschema.ErrColumnExists.GenWithStackByArgs(hiddenCol.Name)
}
}
if indexInfo == nil {
if len(hiddenCols) > 0 {
pos := &ast.ColumnPosition{Tp: ast.ColumnPositionNone}
for _, hiddenCol := range hiddenCols {
_, _, _, err = createColumnInfo(tblInfo, hiddenCol, pos)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
}
}
if err = checkAddColumnTooManyColumns(len(tblInfo.Columns)); err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
indexInfo, err = buildIndexInfo(tblInfo, indexName, indexPartSpecifications, model.StateNone)
if err != nil {
job.State = model.JobStateCancelled
return ver, errors.Trace(err)
}
if indexOption != nil {
indexInfo.Comment = indexOption.Comment
if indexOption.Visibility == ast.IndexVisibilityInvisible {
indexInfo.Invisible = true
}
if indexOption.Tp == model.IndexTypeInvalid {
// Use btree as default index type.
indexInfo.Tp = model.IndexTypeBtree
} else {
indexInfo.Tp = indexOption.Tp
}
} else {
// Use btree as default index type.
indexInfo.Tp = model.IndexTypeBtree
}
indexInfo.Primary = false
if isPK {
if _, err = checkPKOnGeneratedColumn(tblInfo, indexPartSpecifications); err != nil {
job.State = model.JobStateCancelled
return ver, err
}
indexInfo.Primary = true
}
indexInfo.Unique = unique
indexInfo.ID = allocateIndexID(tblInfo)
tblInfo.Indices = append(tblInfo.Indices, indexInfo)
// Here we need do this check before set state to `DeleteOnly`,
// because if hidden columns has been set to `DeleteOnly`,
// the `DeleteOnly` columns are missing when we do this check.
if err := checkInvisibleIndexOnPK(tblInfo); err != nil {
job.State = model.JobStateCancelled
return ver, err
}
logutil.BgLogger().Info("[ddl] run add index job", zap.String("job", job.String()), zap.Reflect("indexInfo", indexInfo))
}
originalState := indexInfo.State
switch indexInfo.State {
case model.StateNone:
// none -> delete only
job.SchemaState = model.StateDeleteOnly
indexInfo.State = model.StateDeleteOnly
updateHiddenColumns(tblInfo, indexInfo, model.StateDeleteOnly)
ver, err = updateVersionAndTableInfoWithCheck(t, job, tblInfo, originalState != indexInfo.State)
metrics.AddIndexProgress.Set(0)
case model.StateDeleteOnly:
// delete only -> write only
job.SchemaState = model.StateWriteOnly
indexInfo.State = model.StateWriteOnly
updateHiddenColumns(tblInfo, indexInfo, model.StateWriteOnly)
_, err = checkPrimaryKeyNotNull(w, sqlMode, t, job, tblInfo, indexInfo)
if err != nil {
break
}
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
case model.StateWriteOnly:
// write only -> reorganization
job.SchemaState = model.StateWriteReorganization
indexInfo.State = model.StateWriteReorganization
updateHiddenColumns(tblInfo, indexInfo, model.StateWriteReorganization)
_, err = checkPrimaryKeyNotNull(w, sqlMode, t, job, tblInfo, indexInfo)
if err != nil {
break
}
// Initialize SnapshotVer to 0 for later reorganization check.
job.SnapshotVer = 0
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
case model.StateWriteReorganization:
// reorganization -> public
updateHiddenColumns(tblInfo, indexInfo, model.StatePublic)
tbl, err := getTable(d.store, schemaID, tblInfo)
if err != nil {
return ver, errors.Trace(err)
}
reorgInfo, err := getReorgInfo(d, t, job, tbl)
if err != nil || reorgInfo.first {
// If we run reorg firstly, we should update the job snapshot version
// and then run the reorg next time.
return ver, errors.Trace(err)
}
err = w.runReorgJob(t, reorgInfo, tbl.Meta(), d.lease, func() (addIndexErr error) {
defer util.Recover(metrics.LabelDDL, "onCreateIndex",
func() {
addIndexErr = errCancelledDDLJob.GenWithStack("add table `%v` index `%v` panic", tblInfo.Name, indexInfo.Name)
}, false)
return w.addTableIndex(tbl, indexInfo, reorgInfo)
})
if err != nil {
if errWaitReorgTimeout.Equal(err) {
// if timeout, we should return, check for the owner and re-wait job done.
return ver, nil
}
if kv.ErrKeyExists.Equal(err) || errCancelledDDLJob.Equal(err) || errCantDecodeIndex.Equal(err) {
logutil.BgLogger().Warn("[ddl] run add index job failed, convert job to rollback", zap.String("job", job.String()), zap.Error(err))
ver, err = convertAddIdxJob2RollbackJob(t, job, tblInfo, indexInfo, err)
}
// Clean up the channel of notifyCancelReorgJob. Make sure it can't affect other jobs.
w.reorgCtx.cleanNotifyReorgCancel()
return ver, errors.Trace(err)
}
// Clean up the channel of notifyCancelReorgJob. Make sure it can't affect other jobs.
w.reorgCtx.cleanNotifyReorgCancel()
indexInfo.State = model.StatePublic
// Set column index flag.
addIndexColumnFlag(tblInfo, indexInfo)
if isPK {
if err = updateColsNull2NotNull(tblInfo, indexInfo); err != nil {
return ver, errors.Trace(err)
}
}
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
if err != nil {
return ver, errors.Trace(err)
}
// Finish this job.
job.FinishTableJob(model.JobStateDone, model.StatePublic, ver, tblInfo)
default:
err = ErrInvalidDDLState.GenWithStackByArgs("index", tblInfo.State)
}
return ver, errors.Trace(err)
}
func onDropIndex(t *meta.Meta, job *model.Job) (ver int64, _ error) {
tblInfo, indexInfo, err := checkDropIndex(t, job)
if err != nil {
return ver, errors.Trace(err)
}
dependentHiddenCols := make([]*model.ColumnInfo, 0)
for _, indexColumn := range indexInfo.Columns {
if tblInfo.Columns[indexColumn.Offset].Hidden {
dependentHiddenCols = append(dependentHiddenCols, tblInfo.Columns[indexColumn.Offset])
}
}
originalState := indexInfo.State
switch indexInfo.State {
case model.StatePublic:
// public -> write only
job.SchemaState = model.StateWriteOnly
indexInfo.State = model.StateWriteOnly
if len(dependentHiddenCols) > 0 {
firstHiddenOffset := dependentHiddenCols[0].Offset
for i := 0; i < len(dependentHiddenCols); i++ {
tblInfo.Columns[firstHiddenOffset].State = model.StateWriteOnly
// Set this column's offset to the last and reset all following columns' offsets.
adjustColumnInfoInDropColumn(tblInfo, firstHiddenOffset)
}
}
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
case model.StateWriteOnly:
// write only -> delete only
job.SchemaState = model.StateDeleteOnly
indexInfo.State = model.StateDeleteOnly
updateHiddenColumns(tblInfo, indexInfo, model.StateDeleteOnly)
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
case model.StateDeleteOnly:
// delete only -> reorganization
job.SchemaState = model.StateDeleteReorganization
indexInfo.State = model.StateDeleteReorganization
updateHiddenColumns(tblInfo, indexInfo, model.StateDeleteReorganization)
ver, err = updateVersionAndTableInfo(t, job, tblInfo, originalState != indexInfo.State)
case model.StateDeleteReorganization:
// reorganization -> absent
newIndices := make([]*model.IndexInfo, 0, len(tblInfo.Indices))
for _, idx := range tblInfo.Indices {
if idx.Name.L != indexInfo.Name.L {
newIndices = append(newIndices, idx)
}
}
tblInfo.Indices = newIndices
// Set column index flag.
dropIndexColumnFlag(tblInfo, indexInfo)
tblInfo.Columns = tblInfo.Columns[:len(tblInfo.Columns)-len(dependentHiddenCols)]
ver, err = updateVersionAndTableInfoWithCheck(t, job, tblInfo, originalState != model.StateNone)
if err != nil {
return ver, errors.Trace(err)
}
// Finish this job.
if job.IsRollingback() {
job.FinishTableJob(model.JobStateRollbackDone, model.StateNone, ver, tblInfo)
job.Args[0] = indexInfo.ID
// the partition ids were append by convertAddIdxJob2RollbackJob, it is weird, but for the compatibility,
// we should keep appending the partitions in the convertAddIdxJob2RollbackJob.
} else {
job.FinishTableJob(model.JobStateDone, model.StateNone, ver, tblInfo)
job.Args = append(job.Args, indexInfo.ID, getPartitionIDs(tblInfo))
}
default:
err = ErrInvalidDDLState.GenWithStackByArgs("index", indexInfo.State)
}
return ver, errors.Trace(err)
}
func checkDropIndex(t *meta.Meta, job *model.Job) (*model.TableInfo, *model.IndexInfo, error) {
schemaID := job.SchemaID
tblInfo, err := getTableInfoAndCancelFaultJob(t, job, schemaID)
if err != nil {
return nil, nil, errors.Trace(err)
}
var indexName model.CIStr
if err = job.DecodeArgs(&indexName); err != nil {
job.State = model.JobStateCancelled
return nil, nil, errors.Trace(err)
}
indexInfo := tblInfo.FindIndexByName(indexName.L)
if indexInfo == nil {
job.State = model.JobStateCancelled
return nil, nil, ErrCantDropFieldOrKey.GenWithStack("index %s doesn't exist", indexName)
}
// Double check for drop index on auto_increment column.
err = checkDropIndexOnAutoIncrementColumn(tblInfo, indexInfo)
if err != nil {
job.State = model.JobStateCancelled
return nil, nil, autoid.ErrWrongAutoKey
}
return tblInfo, indexInfo, nil
}
func checkDropIndexOnAutoIncrementColumn(tblInfo *model.TableInfo, indexInfo *model.IndexInfo) error {
cols := tblInfo.Columns
for _, idxCol := range indexInfo.Columns {
flag := cols[idxCol.Offset].Flag
if !mysql.HasAutoIncrementFlag(flag) {
continue
}
// check the count of index on auto_increment column.
count := 0
for _, idx := range tblInfo.Indices {
for _, c := range idx.Columns {
if c.Name.L == idxCol.Name.L {
count++
break
}
}
}
if tblInfo.PKIsHandle && mysql.HasPriKeyFlag(flag) {
count++
}
if count < 2 {
return autoid.ErrWrongAutoKey
}
}
return nil
}
func checkRenameIndex(t *meta.Meta, job *model.Job) (*model.TableInfo, model.CIStr, model.CIStr, error) {
var from, to model.CIStr
schemaID := job.SchemaID
tblInfo, err := getTableInfoAndCancelFaultJob(t, job, schemaID)
if err != nil {
return nil, from, to, errors.Trace(err)
}
if err := job.DecodeArgs(&from, &to); err != nil {
job.State = model.JobStateCancelled
return nil, from, to, errors.Trace(err)
}
// Double check. See function `RenameIndex` in ddl_api.go
duplicate, err := validateRenameIndex(from, to, tblInfo)
if duplicate {
return nil, from, to, nil
}
if err != nil {
job.State = model.JobStateCancelled
return nil, from, to, errors.Trace(err)
}
return tblInfo, from, to, errors.Trace(err)
}
func checkAlterIndexVisibility(t *meta.Meta, job *model.Job) (*model.TableInfo, model.CIStr, bool, error) {
var (
indexName model.CIStr
invisible bool
)
schemaID := job.SchemaID
tblInfo, err := getTableInfoAndCancelFaultJob(t, job, schemaID)
if err != nil {
return nil, indexName, invisible, errors.Trace(err)
}
if err := job.DecodeArgs(&indexName, &invisible); err != nil {
job.State = model.JobStateCancelled
return nil, indexName, invisible, errors.Trace(err)
}
skip, err := validateAlterIndexVisibility(indexName, invisible, tblInfo)
if err != nil {
job.State = model.JobStateCancelled
return nil, indexName, invisible, errors.Trace(err)
}
if skip {
return nil, indexName, invisible, nil
}
return tblInfo, indexName, invisible, nil
}
const (
// DefaultTaskHandleCnt is default batch size of adding indices.
DefaultTaskHandleCnt = 128
)
// indexRecord is the record information of an index.
type indexRecord struct {
handle kv.Handle
key []byte // It's used to lock a record. Record it to reduce the encoding time.
vals []types.Datum // It's the index values.
skip bool // skip indicates that the index key is already exists, we should not add it.
}
type addIndexWorker struct {
id int
ddlWorker *worker
batchCnt int
sessCtx sessionctx.Context
taskCh chan *reorgIndexTask
resultCh chan *addIndexResult
index table.Index
table table.Table
closed bool
priority int
// The following attributes are used to reduce memory allocation.
defaultVals []types.Datum
idxRecords []*indexRecord
rowMap map[int64]types.Datum
rowDecoder *decoder.RowDecoder
idxKeyBufs [][]byte
batchCheckKeys []kv.Key
distinctCheckFlags []bool
}
type reorgIndexTask struct {
physicalTableID int64
startHandle kv.Handle
endHandle kv.Handle
// endIncluded indicates whether the range include the endHandle.
// When the last handle is math.MaxInt64, set endIncluded to true to
// tell worker backfilling index of endHandle.
endIncluded bool
}
func (r *reorgIndexTask) String() string {
rightParenthesis := ")"
if r.endIncluded {
rightParenthesis = "]"
}
return "physicalTableID" + strconv.FormatInt(r.physicalTableID, 10) + "_" + "[" + r.startHandle.String() + "," + r.endHandle.String() + rightParenthesis
}
type addIndexResult struct {
addedCount int
scanCount int
nextHandle kv.Handle
err error
}
// addIndexTaskContext is the context of the batch adding indices.
// After finishing the batch adding indices, result in addIndexTaskContext will be merged into addIndexResult.
type addIndexTaskContext struct {
nextHandle kv.Handle
done bool
addedCount int
scanCount int
}
// mergeAddIndexCtxToResult merge partial result in taskCtx into result.
func mergeAddIndexCtxToResult(taskCtx *addIndexTaskContext, result *addIndexResult) {
result.nextHandle = taskCtx.nextHandle
result.addedCount += taskCtx.addedCount
result.scanCount += taskCtx.scanCount
}
func newAddIndexWorker(sessCtx sessionctx.Context, worker *worker, id int, t table.PhysicalTable, indexInfo *model.IndexInfo, decodeColMap map[int64]decoder.Column) *addIndexWorker {
index := tables.NewIndex(t.GetPhysicalID(), t.Meta(), indexInfo)
rowDecoder := decoder.NewRowDecoder(t, decodeColMap)
return &addIndexWorker{
id: id,
ddlWorker: worker,
batchCnt: int(variable.GetDDLReorgBatchSize()),
sessCtx: sessCtx,
taskCh: make(chan *reorgIndexTask, 1),
resultCh: make(chan *addIndexResult, 1),
index: index,
table: t,
rowDecoder: rowDecoder,
priority: kv.PriorityLow,
defaultVals: make([]types.Datum, len(t.Cols())),
rowMap: make(map[int64]types.Datum, len(decodeColMap)),
}
}
func (w *addIndexWorker) close() {
if !w.closed {
w.closed = true
close(w.taskCh)
}
}
// getIndexRecord gets index columns values from raw binary value row.
func (w *addIndexWorker) getIndexRecord(handle kv.Handle, recordKey []byte, rawRecord []byte) (*indexRecord, error) {
t := w.table
cols := t.Cols()
idxInfo := w.index.Meta()
sysZone := timeutil.SystemLocation()
_, err := w.rowDecoder.DecodeAndEvalRowWithMap(w.sessCtx, handle, rawRecord, time.UTC, sysZone, w.rowMap)
if err != nil {
return nil, errors.Trace(errCantDecodeIndex.GenWithStackByArgs(err))
}
idxVal := make([]types.Datum, len(idxInfo.Columns))
for j, v := range idxInfo.Columns {
col := cols[v.Offset]
idxColumnVal, ok := w.rowMap[col.ID]
if ok {
idxVal[j] = idxColumnVal
// Make sure there is no dirty data.
delete(w.rowMap, col.ID)
continue
}
idxColumnVal, err = tables.GetColDefaultValue(w.sessCtx, col, w.defaultVals)
if err != nil {
return nil, errors.Trace(err)
}
if idxColumnVal.Kind() == types.KindMysqlTime {
t := idxColumnVal.GetMysqlTime()
if t.Type() == mysql.TypeTimestamp && sysZone != time.UTC {
err := t.ConvertTimeZone(sysZone, time.UTC)
if err != nil {
return nil, errors.Trace(err)
}
idxColumnVal.SetMysqlTime(t)
}
}
idxVal[j] = idxColumnVal
}
// If there are generated column, rowDecoder will use column value that not in idxInfo.Columns to calculate
// the generated value, so we need to clear up the reusing map.
w.cleanRowMap()
idxRecord := &indexRecord{handle: handle, key: recordKey, vals: idxVal}
return idxRecord, nil
}
func (w *addIndexWorker) cleanRowMap() {
for id := range w.rowMap {
delete(w.rowMap, id)
}
}
// getNextHandle gets next handle of entry that we are going to process.
func (w *addIndexWorker) getNextHandle(taskRange reorgIndexTask, taskDone bool) (nextHandle kv.Handle) {
if !taskDone {
// The task is not done. So we need to pick the last processed entry's handle and add one.
return w.idxRecords[len(w.idxRecords)-1].handle.Next()
}
// The task is done. So we need to choose a handle outside this range.
// Some corner cases should be considered:
// - The end of task range is MaxInt64.
// - The end of the task is excluded in the range.
if (taskRange.endHandle.IsInt() && taskRange.endHandle.IntValue() == math.MaxInt64) || !taskRange.endIncluded {
return taskRange.endHandle
}
return taskRange.endHandle.Next()
}
// fetchRowColVals fetch w.batchCnt count rows that need to backfill indices, and build the corresponding indexRecord slice.
// fetchRowColVals returns:
// 1. The corresponding indexRecord slice.
// 2. Next handle of entry that we need to process.
// 3. Boolean indicates whether the task is done.
// 4. error occurs in fetchRowColVals. nil if no error occurs.
func (w *addIndexWorker) fetchRowColVals(txn kv.Transaction, taskRange reorgIndexTask) ([]*indexRecord, kv.Handle, bool, error) {
// TODO: use tableScan to prune columns.
w.idxRecords = w.idxRecords[:0]
startTime := time.Now()
// taskDone means that the added handle is out of taskRange.endHandle.
taskDone := false
oprStartTime := startTime
err := iterateSnapshotRows(w.sessCtx.GetStore(), w.priority, w.table, txn.StartTS(), taskRange.startHandle, taskRange.endHandle, taskRange.endIncluded,
func(handle kv.Handle, recordKey kv.Key, rawRow []byte) (bool, error) {
oprEndTime := time.Now()
w.logSlowOperations(oprEndTime.Sub(oprStartTime), "iterateSnapshotRows in fetchRowColVals", 0)
oprStartTime = oprEndTime
if !taskRange.endIncluded {
taskDone = handle.Compare(taskRange.endHandle) >= 0
} else {
taskDone = handle.Compare(taskRange.endHandle) > 0
}
if taskDone || len(w.idxRecords) >= w.batchCnt {
return false, nil
}
idxRecord, err1 := w.getIndexRecord(handle, recordKey, rawRow)
if err1 != nil {
return false, errors.Trace(err1)
}
w.idxRecords = append(w.idxRecords, idxRecord)
if handle.Equal(taskRange.endHandle) {
// If taskRange.endIncluded == false, we will not reach here when handle == taskRange.endHandle
taskDone = true
return false, nil
}
return true, nil
})
if len(w.idxRecords) == 0 {
taskDone = true
}
logutil.BgLogger().Debug("[ddl] txn fetches handle info", zap.Uint64("txnStartTS", txn.StartTS()), zap.String("taskRange", taskRange.String()), zap.Duration("takeTime", time.Since(startTime)))
return w.idxRecords, w.getNextHandle(taskRange, taskDone), taskDone, errors.Trace(err)
}
func (w *addIndexWorker) logSlowOperations(elapsed time.Duration, slowMsg string, threshold uint32) {
if threshold == 0 {
threshold = atomic.LoadUint32(&variable.DDLSlowOprThreshold)
}
if elapsed >= time.Duration(threshold)*time.Millisecond {
logutil.BgLogger().Info("[ddl] slow operations", zap.Duration("takeTimes", elapsed), zap.String("msg", slowMsg))
}
}