/
util.go
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/
util.go
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// Copyright 2017 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.
package util
import (
"bytes"
"context"
"encoding/hex"
"strings"
"time"
"github.com/pingcap/errors"
"github.com/tikv/client-go/v2/tikvrpc"
"github.com/wuhuizuo/tidb6/kv"
"github.com/wuhuizuo/tidb6/parser/terror"
"github.com/wuhuizuo/tidb6/sessionctx"
"github.com/wuhuizuo/tidb6/sessionctx/variable"
"github.com/wuhuizuo/tidb6/util/chunk"
"github.com/wuhuizuo/tidb6/util/logutil"
"github.com/wuhuizuo/tidb6/util/sqlexec"
atomicutil "go.uber.org/atomic"
"go.uber.org/zap"
)
const (
deleteRangesTable = `gc_delete_range`
doneDeleteRangesTable = `gc_delete_range_done`
loadDeleteRangeSQL = `SELECT HIGH_PRIORITY job_id, element_id, start_key, end_key FROM mysql.%n WHERE ts < %?`
recordDoneDeletedRangeSQL = `INSERT IGNORE INTO mysql.gc_delete_range_done SELECT * FROM mysql.gc_delete_range WHERE job_id = %? AND element_id = %?`
completeDeleteRangeSQL = `DELETE FROM mysql.gc_delete_range WHERE job_id = %? AND element_id = %?`
completeDeleteMultiRangesSQL = `DELETE FROM mysql.gc_delete_range WHERE job_id = %?`
updateDeleteRangeSQL = `UPDATE mysql.gc_delete_range SET start_key = %? WHERE job_id = %? AND element_id = %? AND start_key = %?`
deleteDoneRecordSQL = `DELETE FROM mysql.gc_delete_range_done WHERE job_id = %? AND element_id = %?`
loadGlobalVars = `SELECT HIGH_PRIORITY variable_name, variable_value from mysql.global_variables where variable_name in (` // + nameList + ")"
// KeyOpDefaultTimeout is the default timeout for each key operation.
KeyOpDefaultTimeout = 2 * time.Second
// KeyOpRetryInterval is the interval between two key operations.
KeyOpRetryInterval = 30 * time.Millisecond
// DDLAllSchemaVersions is the path on etcd that is used to store all servers current schema versions.
DDLAllSchemaVersions = "/tidb/ddl/all_schema_versions"
// DDLAllSchemaVersionsByJob is the path on etcd that is used to store all servers current schema versions.
DDLAllSchemaVersionsByJob = "/tidb/ddl/all_schema_by_job_versions"
// DDLGlobalSchemaVersion is the path on etcd that is used to store the latest schema versions.
DDLGlobalSchemaVersion = "/tidb/ddl/global_schema_version"
// SessionTTL is the etcd session's TTL in seconds.
SessionTTL = 90
)
// DelRangeTask is for run delete-range command in gc_worker.
type DelRangeTask struct {
StartKey kv.Key
EndKey kv.Key
JobID int64
ElementID int64
}
// Range returns the range [start, end) to delete.
func (t DelRangeTask) Range() (kv.Key, kv.Key) {
return t.StartKey, t.EndKey
}
// LoadDeleteRanges loads delete range tasks from gc_delete_range table.
func LoadDeleteRanges(ctx context.Context, sctx sessionctx.Context, safePoint uint64) (ranges []DelRangeTask, _ error) {
return loadDeleteRangesFromTable(ctx, sctx, deleteRangesTable, safePoint)
}
// LoadDoneDeleteRanges loads deleted ranges from gc_delete_range_done table.
func LoadDoneDeleteRanges(ctx context.Context, sctx sessionctx.Context, safePoint uint64) (ranges []DelRangeTask, _ error) {
return loadDeleteRangesFromTable(ctx, sctx, doneDeleteRangesTable, safePoint)
}
func loadDeleteRangesFromTable(ctx context.Context, sctx sessionctx.Context, table string, safePoint uint64) (ranges []DelRangeTask, _ error) {
rs, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, loadDeleteRangeSQL, table, safePoint)
if rs != nil {
defer terror.Call(rs.Close)
}
if err != nil {
return nil, errors.Trace(err)
}
req := rs.NewChunk(nil)
it := chunk.NewIterator4Chunk(req)
for {
err = rs.Next(context.TODO(), req)
if err != nil {
return nil, errors.Trace(err)
}
if req.NumRows() == 0 {
break
}
for row := it.Begin(); row != it.End(); row = it.Next() {
startKey, err := hex.DecodeString(row.GetString(2))
if err != nil {
return nil, errors.Trace(err)
}
endKey, err := hex.DecodeString(row.GetString(3))
if err != nil {
return nil, errors.Trace(err)
}
ranges = append(ranges, DelRangeTask{
JobID: row.GetInt64(0),
ElementID: row.GetInt64(1),
StartKey: startKey,
EndKey: endKey,
})
}
}
return ranges, nil
}
// CompleteDeleteRange moves a record from gc_delete_range table to gc_delete_range_done table.
func CompleteDeleteRange(sctx sessionctx.Context, dr DelRangeTask) error {
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnDDL)
_, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, "BEGIN")
if err != nil {
return errors.Trace(err)
}
_, err = sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, recordDoneDeletedRangeSQL, dr.JobID, dr.ElementID)
if err != nil {
return errors.Trace(err)
}
err = RemoveFromGCDeleteRange(sctx, dr.JobID, dr.ElementID)
if err != nil {
return errors.Trace(err)
}
_, err = sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, "COMMIT")
return errors.Trace(err)
}
// RemoveFromGCDeleteRange is exported for ddl pkg to use.
func RemoveFromGCDeleteRange(sctx sessionctx.Context, jobID, elementID int64) error {
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnDDL)
_, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, completeDeleteRangeSQL, jobID, elementID)
return errors.Trace(err)
}
// RemoveMultiFromGCDeleteRange is exported for ddl pkg to use.
func RemoveMultiFromGCDeleteRange(ctx context.Context, sctx sessionctx.Context, jobID int64) error {
_, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, completeDeleteMultiRangesSQL, jobID)
return errors.Trace(err)
}
// DeleteDoneRecord removes a record from gc_delete_range_done table.
func DeleteDoneRecord(sctx sessionctx.Context, dr DelRangeTask) error {
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnDDL)
_, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, deleteDoneRecordSQL, dr.JobID, dr.ElementID)
return errors.Trace(err)
}
// UpdateDeleteRange is only for emulator.
func UpdateDeleteRange(sctx sessionctx.Context, dr DelRangeTask, newStartKey, oldStartKey kv.Key) error {
newStartKeyHex := hex.EncodeToString(newStartKey)
oldStartKeyHex := hex.EncodeToString(oldStartKey)
ctx := kv.WithInternalSourceType(context.Background(), kv.InternalTxnDDL)
_, err := sctx.(sqlexec.SQLExecutor).ExecuteInternal(ctx, updateDeleteRangeSQL, newStartKeyHex, dr.JobID, dr.ElementID, oldStartKeyHex)
return errors.Trace(err)
}
// LoadDDLReorgVars loads ddl reorg variable from mysql.global_variables.
func LoadDDLReorgVars(ctx context.Context, sctx sessionctx.Context) error {
// close issue #21391
// variable.TiDBRowFormatVersion is used to encode the new row for column type change.
return LoadGlobalVars(ctx, sctx, []string{variable.TiDBDDLReorgWorkerCount, variable.TiDBDDLReorgBatchSize, variable.TiDBRowFormatVersion})
}
// LoadDDLVars loads ddl variable from mysql.global_variables.
func LoadDDLVars(ctx sessionctx.Context) error {
return LoadGlobalVars(context.Background(), ctx, []string{variable.TiDBDDLErrorCountLimit})
}
// LoadGlobalVars loads global variable from mysql.global_variables.
func LoadGlobalVars(ctx context.Context, sctx sessionctx.Context, varNames []string) error {
ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnDDL)
if e, ok := sctx.(sqlexec.RestrictedSQLExecutor); ok {
var buf strings.Builder
buf.WriteString(loadGlobalVars)
paramNames := make([]interface{}, 0, len(varNames))
for i, name := range varNames {
if i > 0 {
buf.WriteString(", ")
}
buf.WriteString("%?")
paramNames = append(paramNames, name)
}
buf.WriteString(")")
rows, _, err := e.ExecRestrictedSQL(ctx, nil, buf.String(), paramNames...)
if err != nil {
return errors.Trace(err)
}
for _, row := range rows {
varName := row.GetString(0)
varValue := row.GetString(1)
if err = sctx.GetSessionVars().SetSystemVarWithoutValidation(varName, varValue); err != nil {
return err
}
}
}
return nil
}
// GetTimeZone gets the session location's zone name and offset.
func GetTimeZone(sctx sessionctx.Context) (string, int) {
loc := sctx.GetSessionVars().Location()
name := loc.String()
if name != "" {
_, err := time.LoadLocation(name)
if err == nil {
return name, 0
}
}
_, offset := time.Now().In(loc).Zone()
return "UTC", offset
}
// enableEmulatorGC means whether to enable emulator GC. The default is enable.
// In some unit tests, we want to stop emulator GC, then wen can set enableEmulatorGC to 0.
var emulatorGCEnable = atomicutil.NewInt32(1)
// EmulatorGCEnable enables emulator gc. It exports for testing.
func EmulatorGCEnable() {
emulatorGCEnable.Store(1)
}
// EmulatorGCDisable disables emulator gc. It exports for testing.
func EmulatorGCDisable() {
emulatorGCEnable.Store(0)
}
// IsEmulatorGCEnable indicates whether emulator GC enabled. It exports for testing.
func IsEmulatorGCEnable() bool {
return emulatorGCEnable.Load() == 1
}
var internalResourceGroupTag = []byte{0}
// GetInternalResourceGroupTaggerForTopSQL only use for testing.
func GetInternalResourceGroupTaggerForTopSQL() tikvrpc.ResourceGroupTagger {
tagger := func(req *tikvrpc.Request) {
req.ResourceGroupTag = internalResourceGroupTag
}
return tagger
}
// IsInternalResourceGroupTaggerForTopSQL use for testing.
func IsInternalResourceGroupTaggerForTopSQL(tag []byte) bool {
return bytes.Equal(tag, internalResourceGroupTag)
}
// DeleteKeyFromEtcd deletes key value from etcd.
func DeleteKeyFromEtcd(key string, etcdCli *clientv3.Client, retryCnt int, timeout time.Duration) error {
var err error
ctx := context.Background()
for i := 0; i < retryCnt; i++ {
childCtx, cancel := context.WithTimeout(ctx, timeout)
_, err = etcdCli.Delete(childCtx, key)
cancel()
if err == nil {
return nil
}
logutil.BgLogger().Warn("[ddl] etcd-cli delete key failed", zap.String("key", key), zap.Error(err), zap.Int("retryCnt", i))
}
return errors.Trace(err)
}
// PutKVToEtcd puts key value to etcd.
// etcdCli is client of etcd.
// retryCnt is retry time when an error occurs.
// opts are configures of etcd Operations.
func PutKVToEtcd(ctx context.Context, etcdCli *clientv3.Client, retryCnt int, key, val string,
opts ...clientv3.OpOption) error {
var err error
for i := 0; i < retryCnt; i++ {
if IsContextDone(ctx) {
return errors.Trace(ctx.Err())
}
childCtx, cancel := context.WithTimeout(ctx, KeyOpDefaultTimeout)
_, err = etcdCli.Put(childCtx, key, val, opts...)
cancel()
if err == nil {
return nil
}
logutil.BgLogger().Warn("[ddl] etcd-cli put kv failed", zap.String("key", key), zap.String("value", val), zap.Error(err), zap.Int("retryCnt", i))
time.Sleep(KeyOpRetryInterval)
}
return errors.Trace(err)
}
// IsContextDone checks if context is done.
func IsContextDone(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
}
return false
}