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dump/: integrate dumpling (pingcap#540)
Dump sql using dumpling. It's not easy to use for users because they need to download a mydumper binary file.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,232 @@ | ||
| // Copyright 2020 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, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package dumpling | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/pingcap/dm/dm/config" | ||
| "github.com/pingcap/dm/dm/pb" | ||
| "github.com/pingcap/dm/dm/unit" | ||
| "github.com/pingcap/dm/pkg/log" | ||
|
|
||
| "github.com/pingcap/dumpling/v4/export" | ||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/failpoint" | ||
| "github.com/siddontang/go/sync2" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| // Dumpling dumps full data from a MySQL-compatible database | ||
| type Dumpling struct { | ||
| cfg *config.SubTaskConfig | ||
|
|
||
| logger log.Logger | ||
|
|
||
| dumpConfig *export.Config | ||
| closed sync2.AtomicBool | ||
| } | ||
|
|
||
| // NewDumpling creates a new Dumpling | ||
| func NewDumpling(cfg *config.SubTaskConfig) *Dumpling { | ||
| m := &Dumpling{ | ||
| cfg: cfg, | ||
| logger: log.With(zap.String("task", cfg.Name), zap.String("unit", "dump")), | ||
| } | ||
| return m | ||
| } | ||
|
|
||
| // Init implements Unit.Init | ||
| func (m *Dumpling) Init(ctx context.Context) error { | ||
| var err error | ||
| m.dumpConfig, err = m.constructArgs() | ||
| return err | ||
| } | ||
|
|
||
| // Process implements Unit.Process | ||
| func (m *Dumpling) Process(ctx context.Context, pr chan pb.ProcessResult) { | ||
| dumplingExitWithErrorCounter.WithLabelValues(m.cfg.Name).Add(0) | ||
|
|
||
| failpoint.Inject("dumpUnitProcessWithError", func(val failpoint.Value) { | ||
| m.logger.Info("dump unit runs with injected error", zap.String("failpoint", "dumpUnitProcessWithError"), zap.Reflect("error", val)) | ||
| msg, ok := val.(string) | ||
| if !ok { | ||
| msg = "unknown process error" | ||
| } | ||
| pr <- pb.ProcessResult{ | ||
| IsCanceled: false, | ||
| Errors: []*pb.ProcessError{unit.NewProcessError(errors.New(msg))}, | ||
| } | ||
| failpoint.Return() | ||
| }) | ||
|
|
||
| begin := time.Now() | ||
| errs := make([]*pb.ProcessError, 0, 1) | ||
|
|
||
| failpoint.Inject("dumpUnitProcessForever", func() { | ||
| m.logger.Info("dump unit runs forever", zap.String("failpoint", "dumpUnitProcessForever")) | ||
| <-ctx.Done() | ||
| failpoint.Return() | ||
| }) | ||
|
|
||
| // NOTE: remove output dir before start dumping | ||
| // every time re-dump, loader should re-prepare | ||
| err := os.RemoveAll(m.cfg.Dir) | ||
| if err != nil { | ||
| m.logger.Error("fail to remove output directory", zap.String("directory", m.cfg.Dir), log.ShortError(err)) | ||
| errs = append(errs, unit.NewProcessError(err)) | ||
| pr <- pb.ProcessResult{ | ||
| IsCanceled: false, | ||
| Errors: errs, | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // TODO: dumpling can't be canceled now, we may add that in the future | ||
| err = export.Dump(m.dumpConfig) | ||
|
|
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| if err != nil { | ||
| dumplingExitWithErrorCounter.WithLabelValues(m.cfg.Name).Inc() | ||
| errs = append(errs, unit.NewProcessError(err)) | ||
| } | ||
|
|
||
| m.logger.Info("dump data finished", zap.Duration("cost time", time.Since(begin))) | ||
|
|
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| pr <- pb.ProcessResult{ | ||
| IsCanceled: false, | ||
| Errors: errs, | ||
| } | ||
| } | ||
|
|
||
| // Close implements Unit.Close | ||
| func (m *Dumpling) Close() { | ||
| if m.closed.Get() { | ||
| return | ||
| } | ||
| // do nothing, external will cancel the command (if running) | ||
| m.closed.Set(true) | ||
| } | ||
|
|
||
| // Pause implements Unit.Pause | ||
| func (m *Dumpling) Pause() { | ||
| if m.closed.Get() { | ||
| m.logger.Warn("try to pause, but already closed") | ||
| return | ||
| } | ||
| // do nothing, external will cancel the command (if running) | ||
| } | ||
|
|
||
| // Resume implements Unit.Resume | ||
| func (m *Dumpling) Resume(ctx context.Context, pr chan pb.ProcessResult) { | ||
| if m.closed.Get() { | ||
| m.logger.Warn("try to resume, but already closed") | ||
| return | ||
| } | ||
| // just call Process | ||
| m.Process(ctx, pr) | ||
| } | ||
|
|
||
| // Update implements Unit.Update | ||
| func (m *Dumpling) Update(cfg *config.SubTaskConfig) error { | ||
| // not support update configuration now | ||
| return nil | ||
| } | ||
|
|
||
| // Status implements Unit.Status | ||
| func (m *Dumpling) Status() interface{} { | ||
| // NOTE: try to add some status, like dumped file count | ||
| return &pb.DumpStatus{} | ||
| } | ||
|
|
||
| // Error implements Unit.Error | ||
| func (m *Dumpling) Error() interface{} { | ||
| return &pb.DumpError{} | ||
| } | ||
|
|
||
| // Type implements Unit.Type | ||
| func (m *Dumpling) Type() pb.UnitType { | ||
| return pb.UnitType_Dump | ||
| } | ||
|
|
||
| // IsFreshTask implements Unit.IsFreshTask | ||
| func (m *Dumpling) IsFreshTask(ctx context.Context) (bool, error) { | ||
| return true, nil | ||
| } | ||
|
|
||
| // constructArgs constructs arguments for exec.Command | ||
| func (m *Dumpling) constructArgs() (*export.Config, error) { | ||
| cfg := m.cfg | ||
| db := cfg.From | ||
|
|
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| dumpConfig := export.DefaultConfig() | ||
| // ret is used to record the unsupported arguments for dumpling | ||
| var ret []string | ||
| extraArgs := strings.Fields(cfg.ExtraArgs) | ||
| if len(extraArgs) > 0 { | ||
| err := parseExtraArgs(dumpConfig, ParseArgLikeBash(extraArgs)) | ||
| if err != nil { | ||
| m.logger.Warn("parsed some unsupported arguments", zap.Error(err)) | ||
| ret = append(ret, extraArgs...) | ||
| } | ||
| } | ||
| // block status addr because we already have it in DM, and if we enable it, may we need more ports for the process. | ||
| dumpConfig.StatusAddr = "" | ||
|
|
||
| dumpConfig.Host = db.Host | ||
| dumpConfig.Port = db.Port | ||
| dumpConfig.User = db.User | ||
| dumpConfig.Password = db.Password | ||
| dumpConfig.OutputDirPath = cfg.Dir // use LoaderConfig.Dir as output dir | ||
| dumpConfig.BlackWhiteList = export.BWListConf{ | ||
| Mode: export.MySQLReplicationMode, | ||
| Rules: &export.MySQLReplicationConf{ | ||
| Rules: cfg.BWList, | ||
| CaseSensitive: cfg.CaseSensitive, | ||
| }, | ||
| } | ||
| dumpConfig.EscapeBackslash = true | ||
| dumpConfig.Logger = m.logger.Logger | ||
|
|
||
| if cfg.Threads > 0 { | ||
| dumpConfig.Threads = cfg.Threads | ||
| } | ||
| if cfg.ChunkFilesize > 0 { | ||
| dumpConfig.FileSize = uint64(cfg.ChunkFilesize) | ||
| } | ||
| if cfg.StatementSize > 0 { | ||
| dumpConfig.StatementSize = cfg.StatementSize | ||
| } | ||
| if cfg.Rows > 0 { | ||
| dumpConfig.Rows = cfg.Rows | ||
| } | ||
| if len(cfg.Where) > 0 { | ||
| dumpConfig.Where = cfg.Where | ||
| } | ||
|
|
||
| if cfg.SkipTzUTC { | ||
| // TODO: support skip-tz-utc | ||
| ret = append(ret, "--skip-tz-utc") | ||
| } | ||
|
|
||
| // TODO: support String for export.Config | ||
| m.logger.Info("create dumpling", zap.Reflect("config", dumpConfig)) | ||
| if len(ret) > 0 { | ||
| m.logger.Warn("meeting some unsupported arguments", zap.Strings("argument", ret)) | ||
| } | ||
|
|
||
| return dumpConfig, nil | ||
| } |
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