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ddl: support read records with copr for adding index (#39191)
ref #35983
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,221 @@ | ||
| // Copyright 2022 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 ddl | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/distsql" | ||
| "github.com/pingcap/tidb/kv" | ||
| "github.com/pingcap/tidb/parser/model" | ||
| "github.com/pingcap/tidb/parser/mysql" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/sessionctx/stmtctx" | ||
| "github.com/pingcap/tidb/sessionctx/variable" | ||
| "github.com/pingcap/tidb/statistics" | ||
| "github.com/pingcap/tidb/table/tables" | ||
| "github.com/pingcap/tidb/tablecodec" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| "github.com/pingcap/tidb/util/timeutil" | ||
| "github.com/pingcap/tipb/go-tipb" | ||
| ) | ||
|
|
||
| // copReadBatchFactor is the factor of batch size of coprocessor read. | ||
| // It multiplies the tidb_ddl_reorg_batch_size to avoid sending too many cop requests for the same handle range. | ||
| const copReadBatchFactor = 10 | ||
|
|
||
| func (w *addIndexWorker) fetchRowColValsFromCop(txn kv.Transaction, handleRange reorgBackfillTask) ([]*indexRecord, kv.Key, bool, error) { | ||
| w.idxRecords = w.idxRecords[:0] | ||
| start, end := handleRange.startKey, handleRange.excludedEndKey() | ||
| batchCnt := w.batchCnt * copReadBatchFactor | ||
| return fetchRowsFromCop(w.ctx, w.copCtx, start, end, txn.StartTS(), w.idxRecords, batchCnt) | ||
| } | ||
|
|
||
| // fetchRowsFromCop sends a coprocessor request and fetches the first batchCnt rows. | ||
| func fetchRowsFromCop(ctx context.Context, copCtx *copContext, startKey, endKey kv.Key, startTS uint64, | ||
| buf []*indexRecord, batchCnt int) ([]*indexRecord, kv.Key, bool, error) { | ||
| srcResult, err := copCtx.buildTableScan(ctx, startTS, startKey, endKey) | ||
| if err != nil { | ||
| return nil, nil, false, errors.Trace(err) | ||
| } | ||
| var done bool | ||
| buf, done, err = copCtx.fetchTableScanResult(ctx, srcResult, buf, batchCnt) | ||
| nextKey := endKey | ||
| if !done { | ||
| lastHandle := buf[len(buf)-1].handle | ||
| prefix := tablecodec.GenTableRecordPrefix(copCtx.tblInfo.ID) | ||
| nextKey = tablecodec.EncodeRecordKey(prefix, lastHandle).Next() | ||
| } | ||
| return buf, nextKey, done, err | ||
| } | ||
|
|
||
| type copContext struct { | ||
| tblInfo *model.TableInfo | ||
| idxInfo *model.IndexInfo | ||
| pkInfo *model.IndexInfo | ||
| colInfos []*model.ColumnInfo | ||
| fieldTps []*types.FieldType | ||
| sessCtx sessionctx.Context | ||
|
|
||
| srcChunk *chunk.Chunk | ||
| } | ||
|
|
||
| func newCopContext(tblInfo *model.TableInfo, idxInfo *model.IndexInfo, sessCtx sessionctx.Context) *copContext { | ||
| colInfos := make([]*model.ColumnInfo, 0, len(idxInfo.Columns)) | ||
| fieldTps := make([]*types.FieldType, 0, len(idxInfo.Columns)) | ||
| for _, idxCol := range idxInfo.Columns { | ||
| c := tblInfo.Columns[idxCol.Offset] | ||
| if c.IsGenerated() && !c.GeneratedStored { | ||
| // TODO(tangenta): support reading virtual generated columns. | ||
| return nil | ||
| } | ||
| colInfos = append(colInfos, c) | ||
| fieldTps = append(fieldTps, &c.FieldType) | ||
| } | ||
|
|
||
| pkColInfos, pkFieldTps, pkInfo := buildHandleColInfoAndFieldTypes(tblInfo) | ||
| colInfos = append(colInfos, pkColInfos...) | ||
| fieldTps = append(fieldTps, pkFieldTps...) | ||
|
|
||
| copCtx := &copContext{ | ||
| tblInfo: tblInfo, | ||
| idxInfo: idxInfo, | ||
| pkInfo: pkInfo, | ||
| colInfos: colInfos, | ||
| fieldTps: fieldTps, | ||
| sessCtx: sessCtx, | ||
| srcChunk: chunk.NewChunkWithCapacity(fieldTps, variable.DefMaxChunkSize), | ||
| } | ||
| return copCtx | ||
| } | ||
|
|
||
| func (c *copContext) buildTableScan(ctx context.Context, startTS uint64, start, end kv.Key) (distsql.SelectResult, error) { | ||
| dagPB, err := buildDAGPB(c.sessCtx, c.tblInfo, c.colInfos) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var builder distsql.RequestBuilder | ||
| kvReq, err := builder. | ||
| SetDAGRequest(dagPB). | ||
| SetStartTS(startTS). | ||
| SetKeyRanges([]kv.KeyRange{{StartKey: start, EndKey: end}}). | ||
| SetKeepOrder(true). | ||
| SetFromSessionVars(c.sessCtx.GetSessionVars()). | ||
| SetFromInfoSchema(c.sessCtx.GetDomainInfoSchema()). | ||
| SetConcurrency(1). | ||
| Build() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return distsql.Select(ctx, c.sessCtx, kvReq, c.fieldTps, statistics.NewQueryFeedback(0, nil, 0, false)) | ||
| } | ||
|
|
||
| func (c *copContext) fetchTableScanResult(ctx context.Context, result distsql.SelectResult, | ||
| buf []*indexRecord, batchCnt int) ([]*indexRecord, bool, error) { | ||
| sctx := c.sessCtx.GetSessionVars().StmtCtx | ||
| for { | ||
| err := result.Next(ctx, c.srcChunk) | ||
| if err != nil { | ||
| return nil, false, errors.Trace(err) | ||
| } | ||
| if c.srcChunk.NumRows() == 0 { | ||
| return buf, true, nil | ||
| } | ||
| iter := chunk.NewIterator4Chunk(c.srcChunk) | ||
| for row := iter.Begin(); row != iter.End(); row = iter.Next() { | ||
| idxDt, hdDt := extractIdxValsAndHandle(row, c.idxInfo, c.fieldTps) | ||
| handle, err := buildHandle(hdDt, c.tblInfo, c.pkInfo, sctx) | ||
| if err != nil { | ||
| return nil, false, errors.Trace(err) | ||
| } | ||
| rsData := tables.TryGetHandleRestoredDataWrapper(c.tblInfo, hdDt, nil, c.idxInfo) | ||
| buf = append(buf, &indexRecord{handle: handle, key: nil, vals: idxDt, rsData: rsData, skip: false}) | ||
| if len(buf) >= batchCnt { | ||
| return buf, false, nil | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func buildDAGPB(sCtx sessionctx.Context, tblInfo *model.TableInfo, colInfos []*model.ColumnInfo) (*tipb.DAGRequest, error) { | ||
| dagReq := &tipb.DAGRequest{} | ||
| dagReq.TimeZoneName, dagReq.TimeZoneOffset = timeutil.Zone(sCtx.GetSessionVars().Location()) | ||
| sc := sCtx.GetSessionVars().StmtCtx | ||
| dagReq.Flags = sc.PushDownFlags() | ||
| for i := range colInfos { | ||
| dagReq.OutputOffsets = append(dagReq.OutputOffsets, uint32(i)) | ||
| } | ||
| execPB, err := constructTableScanPB(sCtx, tblInfo, colInfos) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| dagReq.Executors = append(dagReq.Executors, execPB) | ||
| distsql.SetEncodeType(sCtx, dagReq) | ||
| return dagReq, nil | ||
| } | ||
|
|
||
| func constructTableScanPB(sCtx sessionctx.Context, tblInfo *model.TableInfo, colInfos []*model.ColumnInfo) (*tipb.Executor, error) { | ||
| tblScan := tables.BuildTableScanFromInfos(tblInfo, colInfos) | ||
| tblScan.TableId = tblInfo.ID | ||
| err := tables.SetPBColumnsDefaultValue(sCtx, tblScan.Columns, colInfos) | ||
| return &tipb.Executor{Tp: tipb.ExecType_TypeTableScan, TblScan: tblScan}, err | ||
| } | ||
|
|
||
| func buildHandleColInfoAndFieldTypes(tbInfo *model.TableInfo) ([]*model.ColumnInfo, []*types.FieldType, *model.IndexInfo) { | ||
| if tbInfo.PKIsHandle { | ||
| for i := range tbInfo.Columns { | ||
| if mysql.HasPriKeyFlag(tbInfo.Columns[i].GetFlag()) { | ||
| return []*model.ColumnInfo{tbInfo.Columns[i]}, []*types.FieldType{&tbInfo.Columns[i].FieldType}, nil | ||
| } | ||
| } | ||
| } else if tbInfo.IsCommonHandle { | ||
| primaryIdx := tables.FindPrimaryIndex(tbInfo) | ||
| pkCols := make([]*model.ColumnInfo, 0, len(primaryIdx.Columns)) | ||
| pkFts := make([]*types.FieldType, 0, len(primaryIdx.Columns)) | ||
| for _, pkCol := range primaryIdx.Columns { | ||
| pkCols = append(pkCols, tbInfo.Columns[pkCol.Offset]) | ||
| pkFts = append(pkFts, &tbInfo.Columns[pkCol.Offset].FieldType) | ||
| } | ||
| return pkCols, pkFts, primaryIdx | ||
| } | ||
| extra := model.NewExtraHandleColInfo() | ||
| return []*model.ColumnInfo{extra}, []*types.FieldType{&extra.FieldType}, nil | ||
| } | ||
|
|
||
| func extractIdxValsAndHandle(row chunk.Row, idxInfo *model.IndexInfo, fieldTps []*types.FieldType) ([]types.Datum, []types.Datum) { | ||
| datumBuf := make([]types.Datum, 0, len(fieldTps)) | ||
| idxColLen := len(idxInfo.Columns) | ||
| for i, ft := range fieldTps { | ||
| datumBuf = append(datumBuf, row.GetDatum(i, ft)) | ||
| } | ||
| return datumBuf[:idxColLen], datumBuf[idxColLen:] | ||
| } | ||
|
|
||
| func buildHandle(pkDts []types.Datum, tblInfo *model.TableInfo, | ||
| pkInfo *model.IndexInfo, stmtCtx *stmtctx.StatementContext) (kv.Handle, error) { | ||
| if tblInfo.IsCommonHandle { | ||
| tablecodec.TruncateIndexValues(tblInfo, pkInfo, pkDts) | ||
| handleBytes, err := codec.EncodeKey(stmtCtx, nil, pkDts...) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return kv.NewCommonHandle(handleBytes) | ||
| } | ||
| return kv.IntHandle(pkDts[0].GetInt64()), nil | ||
| } |
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