Golang Transaction.StartTS方法代码示例

func (e *XSelectIndexExec) doIndexRequest(txn kv.Transaction) (*xapi.SelectResult, error) {
	selIdxReq := new(tipb.SelectRequest)
	startTs := txn.StartTS()
	selIdxReq.StartTs = &startTs
	selIdxReq.IndexInfo = tablecodec.IndexToProto(e.table.Meta(), e.indexPlan.Index)
	var err error
	selIdxReq.Ranges, err = indexRangesToPBRanges(e.indexPlan.Ranges)
	if err != nil {
		return nil, errors.Trace(err)
	}
	return xapi.Select(txn.GetClient(), selIdxReq, 1)
}

func (do *Domain) loadInfoSchema(txn kv.Transaction) (err error) {
	defer func() {
		if err != nil {
			do.SchemaValidity.setLastFailedTS(txn.StartTS())
		}
	}()
	m := meta.NewMeta(txn)
	schemaMetaVersion, err := m.GetSchemaVersion()
	if err != nil {
		return errors.Trace(err)
	}

	info := do.infoHandle.Get()
	if info != nil && schemaMetaVersion <= info.SchemaMetaVersion() {
		// info may be changed by other txn, so here its version may be bigger than schema version,
		// so we don't need to reload.
		log.Debugf("[ddl] schema version is still %d, no need reload", schemaMetaVersion)
		return nil
	}

	schemas, err := m.ListDatabases()
	if err != nil {
		return errors.Trace(err)
	}

	for _, di := range schemas {
		if di.State != model.StatePublic {
			// schema is not public, can't be used outside.
			continue
		}

		tables, err1 := m.ListTables(di.ID)
		if err1 != nil {
			err = err1
			return errors.Trace(err1)
		}

		di.Tables = make([]*model.TableInfo, 0, len(tables))
		for _, tbl := range tables {
			if tbl.State != model.StatePublic {
				// schema is not public, can't be used outsiee.
				continue
			}
			di.Tables = append(di.Tables, tbl)
		}
	}

	log.Infof("[ddl] loadInfoSchema %d", schemaMetaVersion)
	err = do.infoHandle.Set(schemas, schemaMetaVersion)
	return errors.Trace(err)
}

func (d *ddl) fetchRowColVals(txn kv.Transaction, t table.Table, handles []int64, indexInfo *model.IndexInfo) (
	[]*indexRecord, error) {
	// Through handles access to get all row keys.
	handlesLen := len(handles)
	rowKeys := make([]kv.Key, 0, handlesLen)
	for _, h := range handles {
		rowKey := tablecodec.EncodeRecordKey(t.RecordPrefix(), h)
		rowKeys = append(rowKeys, rowKey)
	}

	// Get corresponding raw values for rowKeys.
	ver := kv.Version{Ver: txn.StartTS()}
	snap, err := d.store.GetSnapshot(ver)
	if err != nil {
		return nil, errors.Trace(err)
	}
	pairMap, err := snap.BatchGet(rowKeys)
	if err != nil {
		return nil, errors.Trace(err)
	}

	// Get corresponding values for pairMap.
	cols := t.Cols()
	colMap := make(map[int64]*types.FieldType)
	for _, v := range indexInfo.Columns {
		col := cols[v.Offset]
		colMap[col.ID] = &col.FieldType
	}
	idxRecords := make([]*indexRecord, 0, handlesLen)
	for i, rowKey := range rowKeys {
		rawVal, ok := pairMap[string(rowKey)]
		if !ok {
			// Row doesn't exist, skip it.
			continue
		}
		row, err := tablecodec.DecodeRow(rawVal, colMap)
		if err != nil {
			return nil, errors.Trace(err)
		}
		rowVal := make([]types.Datum, 0, len(indexInfo.Columns))
		for _, v := range indexInfo.Columns {
			col := cols[v.Offset]
			rowVal = append(rowVal, row[col.ID])
		}
		idxRecord := &indexRecord{handle: handles[i], key: rowKey, vals: rowVal}
		idxRecords = append(idxRecords, idxRecord)
	}
	return idxRecords, nil
}

func (e *XSelectIndexExec) doTableRequest(txn kv.Transaction, handles []int64) (*xapi.SelectResult, error) {
	selTableReq := new(tipb.SelectRequest)
	startTs := txn.StartTS()
	selTableReq.StartTs = &startTs
	selTableReq.TableInfo = tablecodec.TableToProto(e.indexPlan.Table)
	selTableReq.Fields = resultFieldsToPBExpression(e.indexPlan.Fields())
	for _, h := range handles {
		if h == math.MaxInt64 {
			// We can't convert MaxInt64 into an left closed, right open range.
			continue
		}
		pbRange := new(tipb.KeyRange)
		pbRange.Low = codec.EncodeInt(nil, h)
		pbRange.High = codec.EncodeInt(nil, h)
		selTableReq.Ranges = append(selTableReq.Ranges, pbRange)
	}
	selTableReq.Where = conditionsToPBExpression(e.indexPlan.FilterConditions...)
	return xapi.Select(txn.GetClient(), selTableReq, 10)
}

func (d *ddl) isReorgRunnable(txn kv.Transaction, flag JobType) error {
	if d.isClosed() {
		// worker is closed, can't run reorganization.
		return errors.Trace(errInvalidWorker.Gen("worker is closed"))
	}

	t := meta.NewMeta(txn)
	owner, err := d.getJobOwner(t, flag)
	if err != nil {
		return errors.Trace(err)
	}
	if owner == nil || owner.OwnerID != d.uuid {
		// if no owner, we will try later, so here just return error.
		// or another server is owner, return error too.
		log.Infof("[ddl] %s job, self id %s owner %s, txnTS:%d", flag, d.uuid, owner, txn.StartTS())
		return errors.Trace(errNotOwner)
	}

	return nil
}