ddl/ingest: add the management infra for lightning struct

br/pkg/lightning/backend/backend.go

@@ -513,6 +513,6 @@ type EngineWriter interface {
 	Close(ctx context.Context) (ChunkFlushStatus, error)
 }
 
-func (engine *OpenedEngine) GetEngineUuid() uuid.UUID {
+func (engine *OpenedEngine) GetEngineUUID() uuid.UUID {
 	return engine.uuid
 }

ddl/lightning/BUILD.bazel

@@ -2,9 +2,45 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "lightning",
-    srcs = ["mem_root.go"],
+    srcs = [
+        "backend.go",
+        "backend_mgr.go",
+        "config.go",
+        "disk_root.go",
+        "engine.go",
+        "engine_mgr.go",
+        "env.go",
+        "mem_root.go",
+        "message.go",
+    ],
     importpath = "github.com/pingcap/tidb/ddl/lightning",
     visibility = ["//visibility:public"],
+    deps = [
+        "//br/pkg/lightning/backend",
+        "//br/pkg/lightning/backend/kv",
+        "//br/pkg/lightning/backend/local",
+        "//br/pkg/lightning/checkpoints",
+        "//br/pkg/lightning/common",
+        "//br/pkg/lightning/config",
+        "//br/pkg/lightning/errormanager",
+        "//br/pkg/lightning/glue",
+        "//br/pkg/lightning/log",
+        "//config",
+        "//kv",
+        "//parser",
+        "//parser/model",
+        "//parser/mysql",
+        "//sessionctx/variable",
+        "//table",
+        "//util/generic",
+        "//util/logutil",
+        "//util/mathutil",
+        "//util/size",
+        "@com_github_google_uuid//:uuid",
+        "@com_github_pingcap_errors//:errors",
+        "@com_github_pkg_errors//:errors",
+        "@org_uber_go_zap//:zap",
+    ],
 )
 
 go_test(

ddl/lightning/backend.go

@@ -0,0 +1,121 @@
+// 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 lightning
+
+import (
+	"context"
+
+	"github.com/pingcap/errors"
+	"github.com/pingcap/tidb/br/pkg/lightning/backend"
+	"github.com/pingcap/tidb/br/pkg/lightning/backend/kv"
+	"github.com/pingcap/tidb/br/pkg/lightning/config"
+	tikv "github.com/pingcap/tidb/kv"
+	"github.com/pingcap/tidb/parser/mysql"
+	"github.com/pingcap/tidb/table"
+	"github.com/pingcap/tidb/util/logutil"
+	"go.uber.org/zap"
+)
+
+// BackendContext store a backend info for add index reorg task.
+type BackendContext struct {
+	jobID    int64
+	backend  *backend.Backend
+	ctx      context.Context
+	cfg      *config.Config
+	EngMgr   engineManager
+	sysVars  map[string]string
+	diskRoot DiskRoot
+	done     bool
+}
+
+// FinishImport imports all the key-values in engine into the storage, collects the duplicate errors if any, and
+// removes the engine from the backend context.
+func (bc *BackendContext) FinishImport(indexID int64, unique bool, tbl table.Table) error {
+	ei, exist := bc.EngMgr.Load(indexID)
+	if !exist {
+		return errors.New(LitErrGetEngineFail)
+	}
+
+	err := ei.ImportAndClean()
+	if err != nil {
+		return err
+	}
+
+	// Check remote duplicate value for the index.
+	if unique {
+		hasDupe, err := bc.backend.CollectRemoteDuplicateRows(bc.ctx, tbl, tbl.Meta().Name.L, &kv.SessionOptions{
+			SQLMode: mysql.ModeStrictAllTables,
+			SysVars: bc.sysVars,
+			IndexID: ei.indexID,
+		})
+		if err != nil {
+			logutil.BgLogger().Error(LitInfoRemoteDupCheck, zap.Error(err),
+				zap.String("table", tbl.Meta().Name.O), zap.Int64("index ID", indexID))
+			return errors.New(LitInfoRemoteDupCheck)
+		} else if hasDupe {
+			logutil.BgLogger().Error(LitErrRemoteDupExistErr,
+				zap.String("table", tbl.Meta().Name.O), zap.Int64("index ID", indexID))
+			return tikv.ErrKeyExists
+		}
+	}
+	return nil
+}
+
+const importThreshold = 0.85
+
+// Flush checks the disk quota and imports the current key-values in engine to the storage.
+func (bc *BackendContext) Flush(indexID int64) error {
+	ei, exist := bc.EngMgr.Load(indexID)
+	if !exist {
+		logutil.BgLogger().Error(LitErrGetEngineFail, zap.Int64("index ID", indexID))
+		return errors.New(LitErrGetEngineFail)
+	}
+
+	err := bc.diskRoot.UpdateUsageAndQuota()
+	if err != nil {
+		logutil.BgLogger().Error(LitErrUpdateDiskStats, zap.Int64("index ID", indexID))
+		return err
+	}
+
+	if bc.diskRoot.CurrentUsage() >= uint64(importThreshold*float64(bc.diskRoot.MaxQuota())) {
+		// TODO: it should be changed according checkpoint solution.
+		// Flush writer cached data into local disk for engine first.
+		err := ei.Flush()
+		if err != nil {
+			return err
+		}
+		logutil.BgLogger().Info(LitInfoUnsafeImport, zap.Int64("index ID", indexID),
+			zap.Uint64("current disk usage", bc.diskRoot.CurrentUsage()),
+			zap.Uint64("max disk quota", bc.diskRoot.MaxQuota()))
+		err = bc.backend.UnsafeImportAndReset(bc.ctx, ei.uuid, int64(config.SplitRegionSize)*int64(config.MaxSplitRegionSizeRatio), int64(config.SplitRegionKeys))
+		if err != nil {
+			logutil.BgLogger().Error(LitErrIngestDataErr, zap.Int64("index ID", indexID),
+				zap.Error(err), zap.Uint64("current disk usage", bc.diskRoot.CurrentUsage()),
+				zap.Uint64("max disk quota", bc.diskRoot.MaxQuota()))
+			return err
+		}
+	}
+	return nil
+}
+
+// Done returns true if the lightning backfill is done.
+func (bc *BackendContext) Done() bool {
+	return bc.done
+}
+
+// SetDone sets the done flag.
+func (bc *BackendContext) SetDone() {
+	bc.done = true
+}

ddl/lightning/backend_mgr.go

@@ -0,0 +1,192 @@
+// 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 lightning
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"math"
+
+	"github.com/pingcap/tidb/br/pkg/lightning/backend"
+	"github.com/pingcap/tidb/br/pkg/lightning/backend/local"
+	"github.com/pingcap/tidb/br/pkg/lightning/checkpoints"
+	"github.com/pingcap/tidb/br/pkg/lightning/config"
+	"github.com/pingcap/tidb/br/pkg/lightning/errormanager"
+	"github.com/pingcap/tidb/br/pkg/lightning/glue"
+	"github.com/pingcap/tidb/br/pkg/lightning/log"
+	"github.com/pingcap/tidb/parser"
+	"github.com/pingcap/tidb/parser/model"
+	"github.com/pingcap/tidb/parser/mysql"
+	"github.com/pingcap/tidb/util/generic"
+	"github.com/pingcap/tidb/util/logutil"
+	"go.uber.org/zap"
+)
+
+type backendCtxManager struct {
+	generic.SyncMap[int64, *BackendContext]
+	memRoot  MemRoot
+	diskRoot DiskRoot
+}
+
+func (m *backendCtxManager) init(memRoot MemRoot, diskRoot DiskRoot) {
+	m.SyncMap = generic.NewSyncMap[int64, *BackendContext](10)
+	m.memRoot = memRoot
+	m.diskRoot = diskRoot
+}
+
+// Register creates a new backend and registers it to the backend context.
+func (m *backendCtxManager) Register(ctx context.Context, unique bool, jobID int64, _ mysql.SQLMode) (*BackendContext, error) {
+	bc, exist := m.Load(jobID)
+	if !exist {
+		m.memRoot.RefreshConsumption()
+		ok := m.memRoot.CheckConsume(StructSizeBackendCtx)
+		if !ok {
+			return nil, genBackendAllocMemFailedErr(m.memRoot, jobID)
+		}
+		cfg, err := generateLightningConfig(m.memRoot, jobID, unique)
+		if err != nil {
+			logutil.BgLogger().Warn(LitWarnConfigError, zap.Int64("job ID", jobID), zap.Error(err))
+			return nil, err
+		}
+		bd, err := createLocalBackend(ctx, cfg, glueLit{})
+		if err != nil {
+			logutil.BgLogger().Error(LitErrCreateBackendFail, zap.Int64("job ID", jobID), zap.Error(err))
+			return nil, err
+		}
+
+		bcCtx := newBackendContext(ctx, jobID, &bd, cfg, defaultImportantVariables, m.memRoot, m.diskRoot)
+		m.Store(jobID, bcCtx)
+
+		m.memRoot.Consume(StructSizeBackendCtx)
+		logutil.BgLogger().Info(LitInfoCreateBackend, zap.Int64("job ID", jobID),
+			zap.Int64("current memory usage", m.memRoot.CurrentUsage()),
+			zap.Int64("max memory quota", m.memRoot.MaxMemoryQuota()),
+			zap.Bool("is unique index", unique))
+		return bcCtx, nil
+	}
+	return bc, nil
+}
+
+func createLocalBackend(ctx context.Context, cfg *config.Config, glue glue.Glue) (backend.Backend, error) {
+	tls, err := cfg.ToTLS()
+	if err != nil {
+		logutil.BgLogger().Error(LitErrCreateBackendFail, zap.Error(err))
+		return backend.Backend{}, err
+	}
+
+	errorMgr := errormanager.New(nil, cfg, log.Logger{Logger: logutil.BgLogger()})
+	return local.NewLocalBackend(ctx, tls, cfg, glue, int(LitRLimit), errorMgr)
+}
+
+func newBackendContext(ctx context.Context, jobID int64, be *backend.Backend,
+	cfg *config.Config, vars map[string]string, memRoot MemRoot, diskRoot DiskRoot) *BackendContext {
+	bc := &BackendContext{
+		jobID:    jobID,
+		backend:  be,
+		ctx:      ctx,
+		cfg:      cfg,
+		sysVars:  vars,
+		diskRoot: diskRoot,
+	}
+	bc.EngMgr.init(memRoot, diskRoot)
+	return bc
+}
+
+// Unregister removes a backend context from the backend context manager.
+func (m *backendCtxManager) Unregister(jobID int64) {
+	bc, exist := m.Load(jobID)
+	if !exist {
+		return
+	}
+	bc.EngMgr.UnregisterAll(jobID)
+	bc.backend.Close()
+	m.memRoot.Release(StructSizeBackendCtx)
+	m.Delete(jobID)
+	m.memRoot.ReleaseWithTag(encodeBackendTag(jobID))
+	logutil.BgLogger().Info(LitInfoCloseBackend, zap.Int64("job ID", jobID),
+		zap.Int64("current memory usage", m.memRoot.CurrentUsage()),
+		zap.Int64("max memory quota", m.memRoot.MaxMemoryQuota()))
+}
+
+// TotalDiskUsage returns the total disk usage of all backends.
+func (m *backendCtxManager) TotalDiskUsage() uint64 {
+	var totalDiskUsed uint64
+	for _, key := range m.Keys() {
+		bc, exists := m.Load(key)
+		if exists {
+			_, _, bcDiskUsed, _ := bc.backend.CheckDiskQuota(math.MaxInt64)
+			totalDiskUsed += uint64(bcDiskUsed)
+		}
+	}
+	return totalDiskUsed
+}
+
+// UpdateMemoryUsage collects the memory usages from all the backend and updates it to the memRoot.
+func (m *backendCtxManager) UpdateMemoryUsage() {
+	for _, key := range m.Keys() {
+		bc, exists := m.Load(key)
+		if exists {
+			curSize := bc.backend.TotalMemoryConsume()
+			m.memRoot.ReleaseWithTag(encodeBackendTag(bc.jobID))
+			m.memRoot.ConsumeWithTag(encodeBackendTag(bc.jobID), curSize)
+		}
+	}
+}
+
+type glueLit struct{}
+
+// OwnsSQLExecutor Implement interface OwnsSQLExecutor.
+func (glueLit) OwnsSQLExecutor() bool {
+	return false
+}
+
+// GetSQLExecutor Implement interface GetSQLExecutor.
+func (glueLit) GetSQLExecutor() glue.SQLExecutor {
+	return nil
+}
+
+// GetDB Implement interface GetDB.
+func (glueLit) GetDB() (*sql.DB, error) {
+	return nil, nil
+}
+
+// GetParser Implement interface GetParser.
+func (glueLit) GetParser() *parser.Parser {
+	return nil
+}
+
+// GetTables Implement interface GetTables.
+func (glueLit) GetTables(context.Context, string) ([]*model.TableInfo, error) {
+	return nil, nil
+}
+
+// GetSession Implement interface GetSession.
+func (glueLit) GetSession(context.Context) (checkpoints.Session, error) {
+	return nil, nil
+}
+
+// OpenCheckpointsDB Implement interface OpenCheckpointsDB.
+func (glueLit) OpenCheckpointsDB(context.Context, *config.Config) (checkpoints.DB, error) {
+	return nil, nil
+}
+
+// Record is used to report some information (key, value) to host TiDB, including progress, stage currently.
+func (glueLit) Record(string, uint64) {
+}
+
+func encodeBackendTag(jobID int64) string {
+	return fmt.Sprintf("%d", jobID)
+}