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Merge pull request pingcap#9 from tangenta/new_writer-1
support remote backend
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,144 @@ | ||
| // 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. | ||
|
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| package remote | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "path/filepath" | ||
| "strconv" | ||
| "sync" | ||
| "time" | ||
|
|
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| "github.com/google/uuid" | ||
| "github.com/pingcap/tidb/br/pkg/lightning/backend" | ||
| "github.com/pingcap/tidb/br/pkg/lightning/backend/sharedisk" | ||
| "github.com/pingcap/tidb/br/pkg/storage" | ||
| ) | ||
|
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| const defaultRetryBackoffTime = 3 * time.Second | ||
|
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| type Config struct { | ||
| Bucket string | ||
| Prefix string | ||
| AccessKey string | ||
| SecretAccessKey string | ||
| Host string | ||
| Port string | ||
| } | ||
|
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| func NewRemoteBackend(ctx context.Context, cfg *Config) (backend.Backend, error) { | ||
| uri := fmt.Sprintf("s3://%s/%s?access-key=%s&secret-access-key=%s&endpoint=http://%s:%s&force-path-style=true", | ||
| cfg.Bucket, cfg.Prefix, cfg.AccessKey, cfg.SecretAccessKey, cfg.Host, cfg.Port) | ||
| bd, err := storage.ParseBackend(uri, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| extStore, err := storage.New(ctx, bd, &storage.ExternalStorageOptions{}) | ||
| return &remoteBackend{ | ||
| externalStorage: extStore, | ||
| mu: struct { | ||
| sync.RWMutex | ||
| maxWriterID int | ||
| writersSeq map[int]int | ||
| }{}, | ||
| }, nil | ||
| } | ||
|
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| type remoteBackend struct { | ||
| externalStorage storage.ExternalStorage | ||
| mu struct { | ||
| sync.RWMutex | ||
| maxWriterID int | ||
| writersSeq map[int]int | ||
| } | ||
| } | ||
|
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| func (r *remoteBackend) Close() { | ||
| } | ||
|
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| func (r *remoteBackend) RetryImportDelay() time.Duration { | ||
| return defaultRetryBackoffTime | ||
| } | ||
|
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| func (r *remoteBackend) ShouldPostProcess() bool { | ||
| return true | ||
| } | ||
|
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| func (r *remoteBackend) OpenEngine(ctx context.Context, config *backend.EngineConfig, engineUUID uuid.UUID) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) CloseEngine(ctx context.Context, config *backend.EngineConfig, engineUUID uuid.UUID) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) ImportEngine(ctx context.Context, engineUUID uuid.UUID, regionSplitSize, regionSplitKeys int64) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) CleanupEngine(ctx context.Context, engineUUID uuid.UUID) error { | ||
| for wid, seq := range r.mu.writersSeq { | ||
| filePrefix := fmt.Sprintf("%s_%d", engineUUID.String(), wid) | ||
| for i := 1; i <= seq; i++ { | ||
| dataPath := filepath.Join(filePrefix, strconv.Itoa(i)) | ||
| err := r.externalStorage.DeleteFile(ctx, dataPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| statPath := filepath.Join(filePrefix+"_stat", strconv.Itoa(i)) | ||
| err = r.externalStorage.DeleteFile(ctx, statPath) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) FlushEngine(ctx context.Context, engineUUID uuid.UUID) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) FlushAllEngines(ctx context.Context) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) ResetEngine(ctx context.Context, engineUUID uuid.UUID) error { | ||
| return nil | ||
| } | ||
|
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| func (r *remoteBackend) LocalWriter(ctx context.Context, cfg *backend.LocalWriterConfig, engineUUID uuid.UUID) (backend.EngineWriter, error) { | ||
| onClose := func(writerID, currentSeq int) { | ||
| r.saveWriterSeq(writerID, currentSeq) | ||
| } | ||
| return sharedisk.NewWriter(ctx, r.externalStorage, engineUUID, r.allocWriterID(), onClose), nil | ||
| } | ||
|
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| func (r *remoteBackend) allocWriterID() int { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| seq := r.mu.maxWriterID | ||
| r.mu.maxWriterID++ | ||
| return seq | ||
| } | ||
|
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| // saveWriterSeq stores the current writer sequence for the given writer so that | ||
| // we can remove the correct file in external storage when cleaning up. | ||
| func (r *remoteBackend) saveWriterSeq(writerID int, currentSeq int) { | ||
| r.mu.Lock() | ||
| defer r.mu.Unlock() | ||
| r.mu.writersSeq[writerID] = currentSeq | ||
| } |
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