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refactor for the future tn migration 2 (#20571)
refactor for the future tn migration Approved by: @zhangxu19830126
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,270 @@ | ||
| // Copyright 2021 Matrix Origin | ||
| // | ||
| // 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 db | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/google/uuid" | ||
| "github.com/matrixorigin/matrixone/pkg/common/moerr" | ||
| "github.com/matrixorigin/matrixone/pkg/logutil" | ||
| "github.com/matrixorigin/matrixone/pkg/vm/engine/tae/logstore/sm" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| type ControlCmdType uint32 | ||
|
|
||
| const ( | ||
| ControlCmd_Noop ControlCmdType = iota | ||
| ControlCmd_ToReplayMode | ||
| ControlCmd_ToWriteMode | ||
| ) | ||
|
|
||
| func newControlCmd( | ||
| ctx context.Context, | ||
| typ ControlCmdType, | ||
| sarg string, | ||
| ) *controlCmd { | ||
| cmd := &controlCmd{ | ||
| id: uuid.Must(uuid.NewV7()), | ||
| typ: typ, | ||
| ctx: ctx, | ||
| sarg: sarg, | ||
| } | ||
| cmd.wg.Add(1) | ||
| return cmd | ||
| } | ||
|
|
||
| type controlCmd struct { | ||
| id uuid.UUID | ||
| typ ControlCmdType | ||
| err error | ||
| ctx context.Context | ||
| wg sync.WaitGroup | ||
| sarg string | ||
| } | ||
|
|
||
| func (c *controlCmd) String() string { | ||
| return fmt.Sprintf("ControlCmd{id:%s, typ:%d, sarg:%s}", c.id, c.typ, c.sarg) | ||
| } | ||
|
|
||
| func (c *controlCmd) setError(err error) { | ||
| c.err = err | ||
| c.wg.Done() | ||
| } | ||
|
|
||
| func (c *controlCmd) waitDone() { | ||
| c.wg.Wait() | ||
| } | ||
|
|
||
| type Controller struct { | ||
| queue sm.Queue | ||
| db *DB | ||
| } | ||
|
|
||
| func NewController(db *DB) *Controller { | ||
| c := &Controller{ | ||
| db: db, | ||
| } | ||
| c.queue = sm.NewSafeQueue( | ||
| 1, 1, c.onCmd, | ||
| ) | ||
| return c | ||
| } | ||
|
|
||
| func (c *Controller) onCmd(cmds ...any) { | ||
| for _, cmd := range cmds { | ||
| command := cmd.(*controlCmd) | ||
| switch command.typ { | ||
| case ControlCmd_ToReplayMode: | ||
| c.handleToReplayCmd(command) | ||
| case ControlCmd_ToWriteMode: | ||
| c.handleToWriteCmd(command) | ||
| default: | ||
| command.setError( | ||
| moerr.NewInternalErrorNoCtxf("unknown command type %d", command.typ), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (c *Controller) handleToReplayCmd(cmd *controlCmd) { | ||
| switch c.db.GetTxnMode() { | ||
| case DBTxnMode_Replay: | ||
| cmd.setError(nil) | ||
| return | ||
| case DBTxnMode_Write: | ||
| default: | ||
| cmd.setError( | ||
| moerr.NewTxnControlErrorNoCtxf("bad db txn mode %d to replay", c.db.GetTxnMode()), | ||
| ) | ||
| } | ||
| // write mode -> replay mode switch steps: | ||
| // TODO: error handling | ||
|
|
||
| var ( | ||
| err error | ||
| start time.Time = time.Now() | ||
| ) | ||
|
|
||
| logger := logutil.Info | ||
| logger( | ||
| "DB-SwitchToReplay-Start", | ||
| zap.String("cmd", cmd.String()), | ||
| ) | ||
|
|
||
| defer func() { | ||
| if err != nil { | ||
| logger = logutil.Error | ||
| } | ||
| logger( | ||
| "DB-SwitchToReplay-Done", | ||
| zap.String("cmd", cmd.String()), | ||
| zap.Duration("duration", time.Since(start)), | ||
| zap.Error(err), | ||
| ) | ||
| cmd.setError(err) | ||
| }() | ||
|
|
||
| // 1. stop the merge scheduler | ||
| // TODO | ||
|
|
||
| // 2. switch the checkpoint|diskcleaner to replay mode | ||
| // TODO | ||
|
|
||
| // 3. build forward write request tunnel to the new write candidate | ||
| // TODO | ||
|
|
||
| // 4. build logtail tunnel to the new write candidate | ||
| // TODO | ||
|
|
||
| // 5. freeze the write requests consumer | ||
| // TODO | ||
|
|
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| // 6. switch the txn mode to readonly mode | ||
| if err = c.db.TxnMgr.SwitchToReadonly(cmd.ctx); err != nil { | ||
| c.db.TxnMgr.ToWriteMode() | ||
| // TODO: recover the previous state | ||
| return | ||
| } | ||
|
|
||
| // 7. wait the logtail push queue to be flushed | ||
| // TODO | ||
|
|
||
| // 8. send change-writer-config txn to the logservice | ||
| // TODO | ||
|
|
||
| // 9. change the logtail push queue sourcer to the write candidate tunnel | ||
| // TODO | ||
|
|
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| // 10. forward the write requests to the new write candidate | ||
| // TODO | ||
|
|
||
| // 11. replay the log entries from the logservice | ||
| // 11.1 switch the txn mode to replay mode | ||
| c.db.TxnMgr.ToReplayMode() | ||
| // 11.2 TODO: replay the log entries | ||
|
|
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| WithTxnMode(DBTxnMode_Replay)(c.db) | ||
| } | ||
|
|
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| func (c *Controller) handleToWriteCmd(cmd *controlCmd) { | ||
| switch c.db.GetTxnMode() { | ||
| case DBTxnMode_Write: | ||
| cmd.setError(nil) | ||
| return | ||
| case DBTxnMode_Replay: | ||
| default: | ||
| cmd.setError( | ||
| moerr.NewTxnControlErrorNoCtxf("bad db txn mode %d to write", c.db.GetTxnMode()), | ||
| ) | ||
| } | ||
| var ( | ||
| err error | ||
| start time.Time = time.Now() | ||
| ) | ||
|
|
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| logger := logutil.Info | ||
| logger( | ||
| "DB-SwitchToWrite-Start", | ||
| zap.String("cmd", cmd.String()), | ||
| ) | ||
|
|
||
| defer func() { | ||
| if err != nil { | ||
| logger = logutil.Error | ||
| } | ||
| logger( | ||
| "DB-SwitchToWrite-Done", | ||
| zap.String("cmd", cmd.String()), | ||
| zap.Duration("duration", time.Since(start)), | ||
| zap.Error(err), | ||
| ) | ||
| cmd.setError(err) | ||
| }() | ||
|
|
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| // TODO: error handling | ||
| // replay mode -> write mode switch steps: | ||
|
|
||
| // 1. it can only be changed after it receives the change-writer-config txn from the logservice | ||
| // TODO | ||
|
|
||
| // 2. stop replaying the log entries | ||
| // TODO | ||
|
|
||
| // 3. switch the txnmgr to write mode | ||
| c.db.TxnMgr.ToWriteMode() | ||
|
|
||
| // 4. unfreeze the write requests | ||
| // TODO | ||
|
|
||
| // 5. start merge scheduler|checkpoint|diskcleaner | ||
| // TODO | ||
|
|
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| WithTxnMode(DBTxnMode_Write)(c.db) | ||
| } | ||
|
|
||
| func (c *Controller) Start() { | ||
| c.queue.Start() | ||
| } | ||
|
|
||
| func (c *Controller) Stop() { | ||
| c.queue.Stop() | ||
| } | ||
|
|
||
| func (c *Controller) SwitchTxnMode( | ||
| ctx context.Context, | ||
| iarg int, | ||
| sarg string, | ||
| ) error { | ||
| var typ ControlCmdType | ||
| switch iarg { | ||
| case 1: | ||
| typ = ControlCmd_ToReplayMode | ||
| case 2: | ||
| typ = ControlCmd_ToWriteMode | ||
| default: | ||
| return moerr.NewTxnControlErrorNoCtxf("unknown txn mode switch iarg %d", iarg) | ||
| } | ||
| cmd := newControlCmd(ctx, typ, sarg) | ||
| if _, err := c.queue.Enqueue(cmd); err != nil { | ||
| return err | ||
| } | ||
| cmd.waitDone() | ||
| return cmd.err | ||
| } |
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