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session.go
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session.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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
package session
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"fmt"
"net"
"runtime/pprof"
"runtime/trace"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/ngaut/pools"
"github.com/opentracing/opentracing-go"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/parser"
"github.com/pingcap/parser/ast"
"github.com/pingcap/parser/auth"
"github.com/pingcap/parser/charset"
"github.com/pingcap/parser/model"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/parser/terror"
"github.com/pingcap/tidb/table/temptable"
"github.com/pingcap/tidb/util/topsql"
"github.com/pingcap/tipb/go-binlog"
"go.uber.org/zap"
"github.com/pingcap/tidb/bindinfo"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/ddl"
"github.com/pingcap/tidb/ddl/placement"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/errno"
"github.com/pingcap/tidb/executor"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/meta"
"github.com/pingcap/tidb/metrics"
"github.com/pingcap/tidb/owner"
"github.com/pingcap/tidb/planner"
plannercore "github.com/pingcap/tidb/planner/core"
"github.com/pingcap/tidb/plugin"
"github.com/pingcap/tidb/privilege"
"github.com/pingcap/tidb/privilege/privileges"
"github.com/pingcap/tidb/session/txninfo"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/binloginfo"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/statistics"
"github.com/pingcap/tidb/statistics/handle"
storeerr "github.com/pingcap/tidb/store/driver/error"
"github.com/pingcap/tidb/tablecodec"
"github.com/pingcap/tidb/telemetry"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/collate"
"github.com/pingcap/tidb/util/dbterror"
"github.com/pingcap/tidb/util/execdetails"
"github.com/pingcap/tidb/util/kvcache"
"github.com/pingcap/tidb/util/logutil"
"github.com/pingcap/tidb/util/sli"
"github.com/pingcap/tidb/util/sqlexec"
"github.com/pingcap/tidb/util/tableutil"
"github.com/pingcap/tidb/util/timeutil"
tikvstore "github.com/tikv/client-go/v2/kv"
"github.com/tikv/client-go/v2/tikv"
tikvutil "github.com/tikv/client-go/v2/util"
)
var (
statementPerTransactionPessimisticOK = metrics.StatementPerTransaction.WithLabelValues(metrics.LblPessimistic, metrics.LblOK)
statementPerTransactionPessimisticError = metrics.StatementPerTransaction.WithLabelValues(metrics.LblPessimistic, metrics.LblError)
statementPerTransactionOptimisticOK = metrics.StatementPerTransaction.WithLabelValues(metrics.LblOptimistic, metrics.LblOK)
statementPerTransactionOptimisticError = metrics.StatementPerTransaction.WithLabelValues(metrics.LblOptimistic, metrics.LblError)
transactionDurationPessimisticCommit = metrics.TransactionDuration.WithLabelValues(metrics.LblPessimistic, metrics.LblCommit)
transactionDurationPessimisticAbort = metrics.TransactionDuration.WithLabelValues(metrics.LblPessimistic, metrics.LblAbort)
transactionDurationOptimisticCommit = metrics.TransactionDuration.WithLabelValues(metrics.LblOptimistic, metrics.LblCommit)
transactionDurationOptimisticAbort = metrics.TransactionDuration.WithLabelValues(metrics.LblOptimistic, metrics.LblAbort)
sessionExecuteCompileDurationInternal = metrics.SessionExecuteCompileDuration.WithLabelValues(metrics.LblInternal)
sessionExecuteCompileDurationGeneral = metrics.SessionExecuteCompileDuration.WithLabelValues(metrics.LblGeneral)
sessionExecuteParseDurationInternal = metrics.SessionExecuteParseDuration.WithLabelValues(metrics.LblInternal)
sessionExecuteParseDurationGeneral = metrics.SessionExecuteParseDuration.WithLabelValues(metrics.LblGeneral)
telemetryCTEUsage = metrics.TelemetrySQLCTECnt
)
// Session context, it is consistent with the lifecycle of a client connection.
type Session interface {
sessionctx.Context
Status() uint16 // Flag of current status, such as autocommit.
LastInsertID() uint64 // LastInsertID is the last inserted auto_increment ID.
LastMessage() string // LastMessage is the info message that may be generated by last command
AffectedRows() uint64 // Affected rows by latest executed stmt.
// Execute is deprecated, and only used by plugins. Use ExecuteStmt() instead.
Execute(context.Context, string) ([]sqlexec.RecordSet, error) // Execute a sql statement.
// ExecuteStmt executes a parsed statement.
ExecuteStmt(context.Context, ast.StmtNode) (sqlexec.RecordSet, error)
// Parse is deprecated, use ParseWithParams() instead.
Parse(ctx context.Context, sql string) ([]ast.StmtNode, error)
// ExecuteInternal is a helper around ParseWithParams() and ExecuteStmt(). It is not allowed to execute multiple statements.
ExecuteInternal(context.Context, string, ...interface{}) (sqlexec.RecordSet, error)
String() string // String is used to debug.
CommitTxn(context.Context) error
RollbackTxn(context.Context)
// PrepareStmt executes prepare statement in binary protocol.
PrepareStmt(sql string) (stmtID uint32, paramCount int, fields []*ast.ResultField, err error)
// ExecutePreparedStmt executes a prepared statement.
ExecutePreparedStmt(ctx context.Context, stmtID uint32, param []types.Datum) (sqlexec.RecordSet, error)
DropPreparedStmt(stmtID uint32) error
SetClientCapability(uint32) // Set client capability flags.
SetConnectionID(uint64)
SetCommandValue(byte)
SetProcessInfo(string, time.Time, byte, uint64)
SetTLSState(*tls.ConnectionState)
SetCollation(coID int) error
SetSessionManager(util.SessionManager)
Close()
Auth(user *auth.UserIdentity, auth []byte, salt []byte) bool
AuthWithoutVerification(user *auth.UserIdentity) bool
AuthPluginForUser(user *auth.UserIdentity) (string, error)
ShowProcess() *util.ProcessInfo
// Return the information of the txn current running
TxnInfo() *txninfo.TxnInfo
// PrepareTxnCtx is exported for test.
PrepareTxnCtx(context.Context)
// FieldList returns fields list of a table.
FieldList(tableName string) (fields []*ast.ResultField, err error)
SetPort(port string)
// set cur session operations allowed when tikv disk full happens.
SetDiskFullOpt(level kvrpcpb.DiskFullOpt)
GetDiskFullOpt() kvrpcpb.DiskFullOpt
ClearDiskFullOpt()
}
var (
_ Session = (*session)(nil)
)
type stmtRecord struct {
st sqlexec.Statement
stmtCtx *stmtctx.StatementContext
}
// StmtHistory holds all histories of statements in a txn.
type StmtHistory struct {
history []*stmtRecord
}
// Add appends a stmt to history list.
func (h *StmtHistory) Add(st sqlexec.Statement, stmtCtx *stmtctx.StatementContext) {
s := &stmtRecord{
st: st,
stmtCtx: stmtCtx,
}
h.history = append(h.history, s)
}
// Count returns the count of the history.
func (h *StmtHistory) Count() int {
return len(h.history)
}
type session struct {
// processInfo is used by ShowProcess(), and should be modified atomically.
processInfo atomic.Value
txn LazyTxn
mu struct {
sync.RWMutex
values map[fmt.Stringer]interface{}
}
currentCtx context.Context // only use for runtime.trace, Please NEVER use it.
currentPlan plannercore.Plan
store kv.Storage
preparedPlanCache *kvcache.SimpleLRUCache
sessionVars *variable.SessionVars
sessionManager util.SessionManager
statsCollector *handle.SessionStatsCollector
// ddlOwnerChecker is used in `select tidb_is_ddl_owner()` statement;
ddlOwnerChecker owner.DDLOwnerChecker
// lockedTables use to record the table locks hold by the session.
lockedTables map[int64]model.TableLockTpInfo
// client shared coprocessor client per session
client kv.Client
mppClient kv.MPPClient
// indexUsageCollector collects index usage information.
idxUsageCollector *handle.SessionIndexUsageCollector
cache [1]ast.StmtNode
builtinFunctionUsage telemetry.BuiltinFunctionsUsage
// allowed when tikv disk full happened.
diskFullOpt kvrpcpb.DiskFullOpt
}
var parserPool = &sync.Pool{New: func() interface{} { return parser.New() }}
// AddTableLock adds table lock to the session lock map.
func (s *session) AddTableLock(locks []model.TableLockTpInfo) {
for _, l := range locks {
// read only lock is session unrelated, skip it when adding lock to session.
if l.Tp != model.TableLockReadOnly {
s.lockedTables[l.TableID] = l
}
}
}
// ReleaseTableLocks releases table lock in the session lock map.
func (s *session) ReleaseTableLocks(locks []model.TableLockTpInfo) {
for _, l := range locks {
delete(s.lockedTables, l.TableID)
}
}
// ReleaseTableLockByTableIDs releases table lock in the session lock map by table ID.
func (s *session) ReleaseTableLockByTableIDs(tableIDs []int64) {
for _, tblID := range tableIDs {
delete(s.lockedTables, tblID)
}
}
// CheckTableLocked checks the table lock.
func (s *session) CheckTableLocked(tblID int64) (bool, model.TableLockType) {
lt, ok := s.lockedTables[tblID]
if !ok {
return false, model.TableLockNone
}
return true, lt.Tp
}
// GetAllTableLocks gets all table locks table id and db id hold by the session.
func (s *session) GetAllTableLocks() []model.TableLockTpInfo {
lockTpInfo := make([]model.TableLockTpInfo, 0, len(s.lockedTables))
for _, tl := range s.lockedTables {
lockTpInfo = append(lockTpInfo, tl)
}
return lockTpInfo
}
// HasLockedTables uses to check whether this session locked any tables.
// If so, the session can only visit the table which locked by self.
func (s *session) HasLockedTables() bool {
b := len(s.lockedTables) > 0
return b
}
// ReleaseAllTableLocks releases all table locks hold by the session.
func (s *session) ReleaseAllTableLocks() {
s.lockedTables = make(map[int64]model.TableLockTpInfo)
}
// DDLOwnerChecker returns s.ddlOwnerChecker.
func (s *session) DDLOwnerChecker() owner.DDLOwnerChecker {
return s.ddlOwnerChecker
}
func (s *session) cleanRetryInfo() {
if s.sessionVars.RetryInfo.Retrying {
return
}
retryInfo := s.sessionVars.RetryInfo
defer retryInfo.Clean()
if len(retryInfo.DroppedPreparedStmtIDs) == 0 {
return
}
planCacheEnabled := plannercore.PreparedPlanCacheEnabled()
var cacheKey kvcache.Key
var preparedAst *ast.Prepared
if planCacheEnabled {
firstStmtID := retryInfo.DroppedPreparedStmtIDs[0]
if preparedPointer, ok := s.sessionVars.PreparedStmts[firstStmtID]; ok {
preparedObj, ok := preparedPointer.(*plannercore.CachedPrepareStmt)
if ok {
preparedAst = preparedObj.PreparedAst
cacheKey = plannercore.NewPSTMTPlanCacheKey(s.sessionVars, firstStmtID, preparedAst.SchemaVersion)
}
}
}
for i, stmtID := range retryInfo.DroppedPreparedStmtIDs {
if planCacheEnabled {
if i > 0 && preparedAst != nil {
plannercore.SetPstmtIDSchemaVersion(cacheKey, stmtID, preparedAst.SchemaVersion, s.sessionVars.IsolationReadEngines)
}
s.PreparedPlanCache().Delete(cacheKey)
}
s.sessionVars.RemovePreparedStmt(stmtID)
}
}
func (s *session) Status() uint16 {
return s.sessionVars.Status
}
func (s *session) LastInsertID() uint64 {
if s.sessionVars.StmtCtx.LastInsertID > 0 {
return s.sessionVars.StmtCtx.LastInsertID
}
return s.sessionVars.StmtCtx.InsertID
}
func (s *session) LastMessage() string {
return s.sessionVars.StmtCtx.GetMessage()
}
func (s *session) AffectedRows() uint64 {
return s.sessionVars.StmtCtx.AffectedRows()
}
func (s *session) SetClientCapability(capability uint32) {
s.sessionVars.ClientCapability = capability
}
func (s *session) SetConnectionID(connectionID uint64) {
s.sessionVars.ConnectionID = connectionID
}
func (s *session) SetTLSState(tlsState *tls.ConnectionState) {
// If user is not connected via TLS, then tlsState == nil.
if tlsState != nil {
s.sessionVars.TLSConnectionState = tlsState
}
}
func (s *session) SetCommandValue(command byte) {
atomic.StoreUint32(&s.sessionVars.CommandValue, uint32(command))
}
func (s *session) SetCollation(coID int) error {
cs, co, err := charset.GetCharsetInfoByID(coID)
if err != nil {
return err
}
// If new collations are enabled, switch to the default
// collation if this one is not supported.
co = collate.SubstituteMissingCollationToDefault(co)
for _, v := range variable.SetNamesVariables {
terror.Log(s.sessionVars.SetSystemVar(v, cs))
}
return s.sessionVars.SetSystemVar(variable.CollationConnection, co)
}
func (s *session) PreparedPlanCache() *kvcache.SimpleLRUCache {
return s.preparedPlanCache
}
func (s *session) SetSessionManager(sm util.SessionManager) {
s.sessionManager = sm
}
func (s *session) GetSessionManager() util.SessionManager {
return s.sessionManager
}
func (s *session) StoreQueryFeedback(feedback interface{}) {
if fb, ok := feedback.(*statistics.QueryFeedback); !ok || fb == nil || !fb.Valid {
return
}
if s.statsCollector != nil {
do, err := GetDomain(s.store)
if err != nil {
logutil.BgLogger().Debug("domain not found", zap.Error(err))
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblError).Inc()
return
}
err = s.statsCollector.StoreQueryFeedback(feedback, do.StatsHandle())
if err != nil {
logutil.BgLogger().Debug("store query feedback", zap.Error(err))
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblError).Inc()
return
}
metrics.StoreQueryFeedbackCounter.WithLabelValues(metrics.LblOK).Inc()
}
}
// StoreIndexUsage stores index usage information in idxUsageCollector.
func (s *session) StoreIndexUsage(tblID int64, idxID int64, rowsSelected int64) {
if s.idxUsageCollector == nil {
return
}
s.idxUsageCollector.Update(tblID, idxID, &handle.IndexUsageInformation{QueryCount: 1, RowsSelected: rowsSelected})
}
// FieldList returns fields list of a table.
func (s *session) FieldList(tableName string) ([]*ast.ResultField, error) {
is := s.GetInfoSchema().(infoschema.InfoSchema)
dbName := model.NewCIStr(s.GetSessionVars().CurrentDB)
tName := model.NewCIStr(tableName)
pm := privilege.GetPrivilegeManager(s)
if pm != nil && s.sessionVars.User != nil {
if !pm.RequestVerification(s.sessionVars.ActiveRoles, dbName.O, tName.O, "", mysql.AllPrivMask) {
user := s.sessionVars.User
u := user.Username
h := user.Hostname
if len(user.AuthUsername) > 0 && len(user.AuthHostname) > 0 {
u = user.AuthUsername
h = user.AuthHostname
}
return nil, plannercore.ErrTableaccessDenied.GenWithStackByArgs("SELECT", u, h, tableName)
}
}
table, err := is.TableByName(dbName, tName)
if err != nil {
return nil, err
}
cols := table.Cols()
fields := make([]*ast.ResultField, 0, len(cols))
for _, col := range table.Cols() {
rf := &ast.ResultField{
ColumnAsName: col.Name,
TableAsName: tName,
DBName: dbName,
Table: table.Meta(),
Column: col.ColumnInfo,
}
fields = append(fields, rf)
}
return fields, nil
}
func (s *session) TxnInfo() *txninfo.TxnInfo {
s.txn.mu.RLock()
// Copy on read to get a snapshot, this API shouldn't be frequently called.
txnInfo := s.txn.mu.TxnInfo
s.txn.mu.RUnlock()
if txnInfo.StartTS == 0 {
return nil
}
processInfo := s.ShowProcess()
txnInfo.ConnectionID = processInfo.ID
txnInfo.Username = processInfo.User
txnInfo.CurrentDB = processInfo.DB
return &txnInfo
}
func (s *session) doCommit(ctx context.Context) error {
if !s.txn.Valid() {
return nil
}
// to avoid session set overlap the txn set.
if s.GetDiskFullOpt() != kvrpcpb.DiskFullOpt_NotAllowedOnFull {
s.txn.SetDiskFullOpt(s.GetDiskFullOpt())
}
defer func() {
s.txn.changeToInvalid()
s.sessionVars.SetInTxn(false)
s.ClearDiskFullOpt()
}()
if s.txn.IsReadOnly() {
return nil
}
err := s.checkPlacementPolicyBeforeCommit()
if err != nil {
return err
}
// mockCommitError and mockGetTSErrorInRetry use to test PR #8743.
failpoint.Inject("mockCommitError", func(val failpoint.Value) {
if val.(bool) {
if _, err := failpoint.Eval("tikvclient/mockCommitErrorOpt"); err == nil {
failpoint.Return(kv.ErrTxnRetryable)
}
}
})
if s.sessionVars.BinlogClient != nil {
prewriteValue := binloginfo.GetPrewriteValue(s, false)
if prewriteValue != nil {
prewriteData, err := prewriteValue.Marshal()
if err != nil {
return errors.Trace(err)
}
info := &binloginfo.BinlogInfo{
Data: &binlog.Binlog{
Tp: binlog.BinlogType_Prewrite,
PrewriteValue: prewriteData,
},
Client: s.sessionVars.BinlogClient,
}
s.txn.SetOption(kv.BinlogInfo, info)
}
}
sessVars := s.GetSessionVars()
// Get the related table or partition IDs.
relatedPhysicalTables := sessVars.TxnCtx.TableDeltaMap
// Get accessed temporary tables in the transaction.
temporaryTables := sessVars.TxnCtx.TemporaryTables
physicalTableIDs := make([]int64, 0, len(relatedPhysicalTables))
for id := range relatedPhysicalTables {
// Schema change on global temporary tables doesn't affect transactions.
if _, ok := temporaryTables[id]; ok {
continue
}
physicalTableIDs = append(physicalTableIDs, id)
}
// Set this option for 2 phase commit to validate schema lease.
s.txn.SetOption(kv.SchemaChecker, domain.NewSchemaChecker(domain.GetDomain(s), s.GetInfoSchema().SchemaMetaVersion(), physicalTableIDs))
s.txn.SetOption(kv.InfoSchema, s.sessionVars.TxnCtx.InfoSchema)
s.txn.SetOption(kv.CommitHook, func(info string, _ error) { s.sessionVars.LastTxnInfo = info })
if sessVars.EnableAmendPessimisticTxn {
s.txn.SetOption(kv.SchemaAmender, NewSchemaAmenderForTikvTxn(s))
}
s.txn.SetOption(kv.EnableAsyncCommit, sessVars.EnableAsyncCommit)
s.txn.SetOption(kv.Enable1PC, sessVars.Enable1PC)
s.txn.SetOption(kv.ResourceGroupTag, sessVars.StmtCtx.GetResourceGroupTag())
// priority of the sysvar is lower than `start transaction with causal consistency only`
if val := s.txn.GetOption(kv.GuaranteeLinearizability); val == nil || val.(bool) {
// We needn't ask the TiKV client to guarantee linearizability for auto-commit transactions
// because the property is naturally holds:
// We guarantee the commitTS of any transaction must not exceed the next timestamp from the TSO.
// An auto-commit transaction fetches its startTS from the TSO so its commitTS > its startTS > the commitTS
// of any previously committed transactions.
s.txn.SetOption(kv.GuaranteeLinearizability,
sessVars.TxnCtx.IsExplicit && sessVars.GuaranteeLinearizability)
}
if tables := sessVars.TxnCtx.TemporaryTables; len(tables) > 0 {
s.txn.SetOption(kv.KVFilter, temporaryTableKVFilter(tables))
}
return s.commitTxnWithTemporaryData(tikvutil.SetSessionID(ctx, sessVars.ConnectionID), &s.txn)
}
func (s *session) commitTxnWithTemporaryData(ctx context.Context, txn kv.Transaction) error {
sessVars := s.sessionVars
txnTempTables := sessVars.TxnCtx.TemporaryTables
if len(txnTempTables) == 0 {
return txn.Commit(ctx)
}
sessionData := sessVars.TemporaryTableData
var (
stage kv.StagingHandle
localTempTables *infoschema.LocalTemporaryTables
)
if sessVars.LocalTemporaryTables != nil {
localTempTables = sessVars.LocalTemporaryTables.(*infoschema.LocalTemporaryTables)
} else {
localTempTables = new(infoschema.LocalTemporaryTables)
}
defer func() {
// stage != kv.InvalidStagingHandle means error occurs, we need to cleanup sessionData
if stage != kv.InvalidStagingHandle {
sessionData.Cleanup(stage)
}
}()
for tblID, tbl := range txnTempTables {
if !tbl.GetModified() {
continue
}
if tbl.GetMeta().TempTableType != model.TempTableLocal {
continue
}
if _, ok := localTempTables.TableByID(tblID); !ok {
continue
}
if stage == kv.InvalidStagingHandle {
stage = sessionData.Staging()
}
tblPrefix := tablecodec.EncodeTablePrefix(tblID)
endKey := tablecodec.EncodeTablePrefix(tblID + 1)
txnMemBuffer := s.txn.GetMemBuffer()
iter, err := txnMemBuffer.Iter(tblPrefix, endKey)
if err != nil {
return err
}
for iter.Valid() {
key := iter.Key()
if !bytes.HasPrefix(key, tblPrefix) {
break
}
value := iter.Value()
if len(value) == 0 {
err = sessionData.DeleteTableKey(tblID, key)
} else {
err = sessionData.SetTableKey(tblID, key, iter.Value())
}
if err != nil {
return err
}
err = iter.Next()
if err != nil {
return err
}
}
}
err := txn.Commit(ctx)
if err != nil {
return err
}
if stage != kv.InvalidStagingHandle {
sessionData.Release(stage)
stage = kv.InvalidStagingHandle
}
return nil
}
type temporaryTableKVFilter map[int64]tableutil.TempTable
func (m temporaryTableKVFilter) IsUnnecessaryKeyValue(key, value []byte, flags tikvstore.KeyFlags) bool {
tid := tablecodec.DecodeTableID(key)
if _, ok := m[tid]; ok {
return true
}
// This is the default filter for all tables.
return tablecodec.IsUntouchedIndexKValue(key, value)
}
// errIsNoisy is used to filter DUPLCATE KEY errors.
// These can observed by users in INFORMATION_SCHEMA.CLIENT_ERRORS_SUMMARY_GLOBAL instead.
//
// The rationale for filtering these errors is because they are "client generated errors". i.e.
// of the errors defined in kv/error.go, these look to be clearly related to a client-inflicted issue,
// and the server is only responsible for handling the error correctly. It does not need to log.
func errIsNoisy(err error) bool {
if kv.ErrKeyExists.Equal(err) {
return true
}
if storeerr.ErrLockAcquireFailAndNoWaitSet.Equal(err) {
return true
}
return false
}
func (s *session) doCommitWithRetry(ctx context.Context) error {
defer func() {
s.GetSessionVars().SetTxnIsolationLevelOneShotStateForNextTxn()
s.txn.changeToInvalid()
s.cleanRetryInfo()
}()
if !s.txn.Valid() {
// If the transaction is invalid, maybe it has already been rolled back by the client.
return nil
}
var err error
txnSize := s.txn.Size()
isPessimistic := s.txn.IsPessimistic()
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span1 := span.Tracer().StartSpan("session.doCommitWitRetry", opentracing.ChildOf(span.Context()))
defer span1.Finish()
ctx = opentracing.ContextWithSpan(ctx, span1)
}
err = s.doCommit(ctx)
if err != nil {
commitRetryLimit := s.sessionVars.RetryLimit
if !s.sessionVars.TxnCtx.CouldRetry {
commitRetryLimit = 0
}
// Don't retry in BatchInsert mode. As a counter-example, insert into t1 select * from t2,
// BatchInsert already commit the first batch 1000 rows, then it commit 1000-2000 and retry the statement,
// Finally t1 will have more data than t2, with no errors return to user!
if s.isTxnRetryableError(err) && !s.sessionVars.BatchInsert && commitRetryLimit > 0 && !isPessimistic {
logutil.Logger(ctx).Warn("sql",
zap.String("label", s.GetSQLLabel()),
zap.Error(err),
zap.String("txn", s.txn.GoString()))
// Transactions will retry 2 ~ commitRetryLimit times.
// We make larger transactions retry less times to prevent cluster resource outage.
txnSizeRate := float64(txnSize) / float64(kv.TxnTotalSizeLimit)
maxRetryCount := commitRetryLimit - int64(float64(commitRetryLimit-1)*txnSizeRate)
err = s.retry(ctx, uint(maxRetryCount))
} else if !errIsNoisy(err) {
logutil.Logger(ctx).Warn("can not retry txn",
zap.String("label", s.GetSQLLabel()),
zap.Error(err),
zap.Bool("IsBatchInsert", s.sessionVars.BatchInsert),
zap.Bool("IsPessimistic", isPessimistic),
zap.Bool("InRestrictedSQL", s.sessionVars.InRestrictedSQL),
zap.Int64("tidb_retry_limit", s.sessionVars.RetryLimit),
zap.Bool("tidb_disable_txn_auto_retry", s.sessionVars.DisableTxnAutoRetry))
}
}
counter := s.sessionVars.TxnCtx.StatementCount
duration := time.Since(s.GetSessionVars().TxnCtx.CreateTime).Seconds()
s.recordOnTransactionExecution(err, counter, duration)
if err != nil {
if !errIsNoisy(err) {
logutil.Logger(ctx).Warn("commit failed",
zap.String("finished txn", s.txn.GoString()),
zap.Error(err))
}
return err
}
mapper := s.GetSessionVars().TxnCtx.TableDeltaMap
if s.statsCollector != nil && mapper != nil {
for _, item := range mapper {
if item.TableID > 0 {
s.statsCollector.Update(item.TableID, item.Delta, item.Count, &item.ColSize)
}
}
}
return nil
}
func (s *session) CommitTxn(ctx context.Context) error {
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span1 := span.Tracer().StartSpan("session.CommitTxn", opentracing.ChildOf(span.Context()))
defer span1.Finish()
ctx = opentracing.ContextWithSpan(ctx, span1)
}
var commitDetail *tikvutil.CommitDetails
ctx = context.WithValue(ctx, tikvutil.CommitDetailCtxKey, &commitDetail)
err := s.doCommitWithRetry(ctx)
if commitDetail != nil {
s.sessionVars.StmtCtx.MergeExecDetails(nil, commitDetail)
}
failpoint.Inject("keepHistory", func(val failpoint.Value) {
if val.(bool) {
failpoint.Return(err)
}
})
s.sessionVars.TxnCtx.Cleanup()
s.sessionVars.CleanupTxnReadTSIfUsed()
return err
}
func (s *session) RollbackTxn(ctx context.Context) {
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span1 := span.Tracer().StartSpan("session.RollbackTxn", opentracing.ChildOf(span.Context()))
defer span1.Finish()
}
if s.txn.Valid() {
terror.Log(s.txn.Rollback())
}
if ctx.Value(inCloseSession{}) == nil {
s.cleanRetryInfo()
}
s.txn.changeToInvalid()
s.sessionVars.TxnCtx.Cleanup()
s.sessionVars.CleanupTxnReadTSIfUsed()
s.sessionVars.SetInTxn(false)
}
func (s *session) GetClient() kv.Client {
return s.client
}
func (s *session) GetMPPClient() kv.MPPClient {
return s.mppClient
}
func (s *session) String() string {
// TODO: how to print binded context in values appropriately?
sessVars := s.sessionVars
data := map[string]interface{}{
"id": sessVars.ConnectionID,
"user": sessVars.User,
"currDBName": sessVars.CurrentDB,
"status": sessVars.Status,
"strictMode": sessVars.StrictSQLMode,
}
if s.txn.Valid() {
// if txn is committed or rolled back, txn is nil.
data["txn"] = s.txn.String()
}
if sessVars.SnapshotTS != 0 {
data["snapshotTS"] = sessVars.SnapshotTS
}
if sessVars.StmtCtx.LastInsertID > 0 {
data["lastInsertID"] = sessVars.StmtCtx.LastInsertID
}
if len(sessVars.PreparedStmts) > 0 {
data["preparedStmtCount"] = len(sessVars.PreparedStmts)
}
b, err := json.MarshalIndent(data, "", " ")
terror.Log(errors.Trace(err))
return string(b)
}
const sqlLogMaxLen = 1024
// SchemaChangedWithoutRetry is used for testing.
var SchemaChangedWithoutRetry uint32
func (s *session) GetSQLLabel() string {
if s.sessionVars.InRestrictedSQL {
return metrics.LblInternal
}
return metrics.LblGeneral
}
func (s *session) isInternal() bool {
return s.sessionVars.InRestrictedSQL
}
func (s *session) isTxnRetryableError(err error) bool {
if atomic.LoadUint32(&SchemaChangedWithoutRetry) == 1 {
return kv.IsTxnRetryableError(err)
}
return kv.IsTxnRetryableError(err) || domain.ErrInfoSchemaChanged.Equal(err)
}
func (s *session) checkTxnAborted(stmt sqlexec.Statement) error {
var err error
if atomic.LoadUint32(&s.GetSessionVars().TxnCtx.LockExpire) > 0 {
err = kv.ErrLockExpire
} else {
return nil
}
// If the transaction is aborted, the following statements do not need to execute, except `commit` and `rollback`,
// because they are used to finish the aborted transaction.
if _, ok := stmt.(*executor.ExecStmt).StmtNode.(*ast.CommitStmt); ok {
return nil
}
if _, ok := stmt.(*executor.ExecStmt).StmtNode.(*ast.RollbackStmt); ok {
return nil
}
return err
}
func (s *session) retry(ctx context.Context, maxCnt uint) (err error) {
var retryCnt uint
defer func() {
s.sessionVars.RetryInfo.Retrying = false
// retryCnt only increments on retryable error, so +1 here.
metrics.SessionRetry.Observe(float64(retryCnt + 1))
s.sessionVars.SetInTxn(false)
if err != nil {
s.RollbackTxn(ctx)
}
s.txn.changeToInvalid()
}()
connID := s.sessionVars.ConnectionID
s.sessionVars.RetryInfo.Retrying = true
if atomic.LoadUint32(&s.sessionVars.TxnCtx.ForUpdate) == 1 {
err = ErrForUpdateCantRetry.GenWithStackByArgs(connID)
return err
}
nh := GetHistory(s)
var schemaVersion int64
sessVars := s.GetSessionVars()
orgStartTS := sessVars.TxnCtx.StartTS
label := s.GetSQLLabel()
for {
s.PrepareTxnCtx(ctx)
s.sessionVars.RetryInfo.ResetOffset()
for i, sr := range nh.history {
st := sr.st
s.sessionVars.StmtCtx = sr.stmtCtx
s.sessionVars.StmtCtx.ResetForRetry()
s.sessionVars.PreparedParams = s.sessionVars.PreparedParams[:0]
schemaVersion, err = st.RebuildPlan(ctx)
if err != nil {
return err
}
if retryCnt == 0 {
// We do not have to log the query every time.
// We print the queries at the first try only.
sql := sqlForLog(st.GetTextToLog())
if !sessVars.EnableRedactLog {
sql += sessVars.PreparedParams.String()
}
logutil.Logger(ctx).Warn("retrying",
zap.Int64("schemaVersion", schemaVersion),
zap.Uint("retryCnt", retryCnt),
zap.Int("queryNum", i),
zap.String("sql", sql))
} else {
logutil.Logger(ctx).Warn("retrying",
zap.Int64("schemaVersion", schemaVersion),
zap.Uint("retryCnt", retryCnt),
zap.Int("queryNum", i))
}
_, err = st.Exec(ctx)
if err != nil {
s.StmtRollback()
break
}
s.StmtCommit()
}
logutil.Logger(ctx).Warn("transaction association",
zap.Uint64("retrying txnStartTS", s.GetSessionVars().TxnCtx.StartTS),
zap.Uint64("original txnStartTS", orgStartTS))
failpoint.Inject("preCommitHook", func() {
hook, ok := ctx.Value("__preCommitHook").(func())
if ok {
hook()
}
})
if err == nil {
err = s.doCommit(ctx)
if err == nil {
break
}
}
if !s.isTxnRetryableError(err) {
logutil.Logger(ctx).Warn("sql",
zap.String("label", label),
zap.Stringer("session", s),
zap.Error(err))
metrics.SessionRetryErrorCounter.WithLabelValues(label, metrics.LblUnretryable).Inc()
return err
}
retryCnt++
if retryCnt >= maxCnt {
logutil.Logger(ctx).Warn("sql",
zap.String("label", label),
zap.Uint("retry reached max count", retryCnt))
metrics.SessionRetryErrorCounter.WithLabelValues(label, metrics.LblReachMax).Inc()
return err
}
logutil.Logger(ctx).Warn("sql",
zap.String("label", label),
zap.Error(err),
zap.String("txn", s.txn.GoString()))
kv.BackOff(retryCnt)
s.txn.changeToInvalid()
s.sessionVars.SetInTxn(false)
}
return err
}
func sqlForLog(sql string) string {
if len(sql) > sqlLogMaxLen {
sql = sql[:sqlLogMaxLen] + fmt.Sprintf("(len:%d)", len(sql))
}
return executor.QueryReplacer.Replace(sql)
}
type sessionPool interface {
Get() (pools.Resource, error)
Put(pools.Resource)
}
func (s *session) sysSessionPool() sessionPool {
return domain.GetDomain(s).SysSessionPool()
}
func createSessionFunc(store kv.Storage) pools.Factory {
return func() (pools.Resource, error) {
se, err := createSession(store)
if err != nil {
return nil, err
}
err = variable.SetSessionSystemVar(se.sessionVars, variable.AutoCommit, "1")