forked from pingcap/tidb
/
engine_process.go
194 lines (180 loc) · 5.79 KB
/
engine_process.go
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// Copyright 2023 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 importer
import (
"context"
"io"
"github.com/twotigers93/tidb/br/pkg/lightning/backend"
"github.com/twotigers93/tidb/br/pkg/lightning/backend/local"
"github.com/twotigers93/tidb/br/pkg/lightning/checkpoints"
"github.com/twotigers93/tidb/br/pkg/lightning/common"
"github.com/twotigers93/tidb/br/pkg/lightning/mydump"
"go.uber.org/zap"
)
// encode and write all data in this engine as sst files, and write index in indexEngine
// todo: would be better if merge with backend/local/Engine
type engineProcessor struct {
engineID int32
fullTableName string
backend *local.Backend
tableInfo *checkpoints.TidbTableInfo
logger *zap.Logger
tableImporter *TableImporter
rowOrdered bool
indexEngine *backend.OpenedEngine
chunks []*checkpoints.ChunkCheckpoint
}
func (ep *engineProcessor) process(ctx context.Context) (*backend.ClosedEngine, error) {
ep.logger.Info("encode kv data and write start")
dataEngineCfg := &backend.EngineConfig{
TableInfo: ep.tableInfo,
}
if !ep.rowOrdered {
dataEngineCfg.Local.Compact = true
dataEngineCfg.Local.CompactConcurrency = 4
dataEngineCfg.Local.CompactThreshold = local.CompactionUpperThreshold
}
mgr := backend.MakeEngineManager(ep.backend)
dataEngine, err := mgr.OpenEngine(ctx, dataEngineCfg, ep.fullTableName, ep.engineID)
if err != nil {
return nil, err
}
err = ep.localSort(ctx, dataEngine)
// ctx maybe canceled, so to avoid Close engine failed, we use `context.Background()` here
// todo: remove ctx param in Close()
closeCtx := ctx
if common.IsContextCanceledError(err) {
closeCtx = context.Background()
}
closedDataEngine, err2 := dataEngine.Close(closeCtx)
if err2 != nil {
ep.logger.Warn("flush all chunk checkpoints failed before manually exits", zap.Error(err2))
}
return closedDataEngine, err
}
// ProcessChunk processes a chunk, and write kv pairs to dataEngine and indexEngine.
func ProcessChunk(
ctx context.Context,
chunk *checkpoints.ChunkCheckpoint,
tableImporter *TableImporter,
dataEngine,
indexEngine *backend.OpenedEngine,
logger *zap.Logger,
) (err error) {
// if the key are ordered, LocalWrite can optimize the writing.
// table has auto-incremented _tidb_rowid must satisfy following restrictions:
// - clustered index disable and primary key is not number
// - no auto random bits (auto random or shard row id)
// - no partition table
// - no explicit _tidb_rowid field (At this time we can't determine if the source file contains _tidb_rowid field,
// so we will do this check in LocalWriter when the first row is received.)
hasAutoIncrementAutoID := common.TableHasAutoRowID(tableImporter.tableInfo.Core) &&
tableImporter.tableInfo.Core.AutoRandomBits == 0 && tableImporter.tableInfo.Core.ShardRowIDBits == 0 &&
tableImporter.tableInfo.Core.Partition == nil
dataWriterCfg := &backend.LocalWriterConfig{
IsKVSorted: hasAutoIncrementAutoID,
}
closer := multiCloser{
logger: logger,
}
defer func() {
if err != nil {
closer.Close()
}
}()
var (
parser mydump.Parser
encoder kvEncoder
dataWriter, indexWriter backend.EngineWriter
)
closer.reset()
parser, err = tableImporter.getParser(ctx, chunk)
if err != nil {
return err
}
closer.add(parser)
encoder, err = tableImporter.getKVEncoder(chunk)
if err != nil {
return err
}
closer.add(encoder)
// todo: on panic which will be recovered since we run in tidb, we need to make sure all opened fd is closed.
dataWriter, err = dataEngine.LocalWriter(ctx, dataWriterCfg)
if err != nil {
return err
}
closer.addFn(func() error {
_, err2 := dataWriter.Close(ctx)
return err2
})
indexWriter, err = indexEngine.LocalWriter(ctx, &backend.LocalWriterConfig{})
if err != nil {
return err
}
closer.addFn(func() error {
_, err2 := indexWriter.Close(ctx)
return err2
})
cp := &chunkProcessor{
parser: parser,
chunkInfo: chunk,
logger: logger.With(zap.String("key", chunk.GetKey())),
kvsCh: make(chan []deliveredRow, maxKVQueueSize),
dataWriter: dataWriter,
indexWriter: indexWriter,
encoder: encoder,
kvCodec: tableImporter.kvStore.GetCodec(),
progress: tableImporter.Progress,
}
// todo: process in parallel
err = cp.process(ctx)
if err != nil {
return err
}
// chunk process is responsible to close data/index writer
cp.close(ctx)
tableImporter.setLastInsertID(encoder.GetLastInsertID())
return nil
}
// sort data in all chunks, then close the opened data engine
func (ep *engineProcessor) localSort(ctx context.Context, dataEngine *backend.OpenedEngine) (err error) {
for _, chunk := range ep.chunks {
if err := ProcessChunk(ctx, chunk, ep.tableImporter, dataEngine, ep.indexEngine, ep.logger); err != nil {
return err
}
}
return nil
}
type multiCloser struct {
closers []func() error
logger *zap.Logger
}
func (m *multiCloser) add(c io.Closer) {
m.closers = append(m.closers, c.Close)
}
func (m *multiCloser) addFn(c func() error) {
m.closers = append(m.closers, c)
}
func (m *multiCloser) reset() {
m.closers = m.closers[:0]
}
func (m *multiCloser) Close() {
// close in reverse append order
for i := len(m.closers) - 1; i >= 0; i-- {
fn := m.closers[i]
if err := fn(); err != nil {
m.logger.Warn("failed to close", zap.Error(err))
}
}
}