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120 lines
3.4 KiB
120 lines
3.4 KiB
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kv
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import (
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"context"
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"math"
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"math/rand"
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"sync/atomic"
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"time"
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"github.com/pingcap/parser/terror"
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"github.com/pingcap/tidb/util/logutil"
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"go.uber.org/zap"
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)
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// RunInNewTxn will run the f in a new transaction environment.
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func RunInNewTxn(store Storage, retryable bool, f func(txn Transaction) error) error {
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var (
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err error
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originalTxnTS uint64
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txn Transaction
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)
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for i := uint(0); i < maxRetryCnt; i++ {
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txn, err = store.Begin()
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if err != nil {
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logutil.BgLogger().Error("RunInNewTxn", zap.Error(err))
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return err
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}
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// originalTxnTS is used to trace the original transaction when the function is retryable.
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if i == 0 {
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originalTxnTS = txn.StartTS()
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}
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err = f(txn)
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if err != nil {
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err1 := txn.Rollback()
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terror.Log(err1)
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if retryable && IsTxnRetryableError(err) {
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logutil.BgLogger().Warn("RunInNewTxn",
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zap.Uint64("retry txn", txn.StartTS()),
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zap.Uint64("original txn", originalTxnTS),
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zap.Error(err))
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continue
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}
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return err
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}
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err = txn.Commit(context.Background())
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if err == nil {
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break
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}
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if retryable && IsTxnRetryableError(err) {
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logutil.BgLogger().Warn("RunInNewTxn",
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zap.Uint64("retry txn", txn.StartTS()),
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zap.Uint64("original txn", originalTxnTS),
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zap.Error(err))
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BackOff(i)
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continue
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}
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return err
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}
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return err
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}
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var (
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// maxRetryCnt represents maximum retry times in RunInNewTxn.
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maxRetryCnt uint = 100
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// retryBackOffBase is the initial duration, in microsecond, a failed transaction stays dormancy before it retries
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retryBackOffBase = 1
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// retryBackOffCap is the max amount of duration, in microsecond, a failed transaction stays dormancy before it retries
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retryBackOffCap = 100
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)
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// BackOff Implements exponential backoff with full jitter.
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// Returns real back off time in microsecond.
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// See http://www.awsarchitectureblog.com/2015/03/backoff.html.
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func BackOff(attempts uint) int {
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upper := int(math.Min(float64(retryBackOffCap), float64(retryBackOffBase)*math.Pow(2.0, float64(attempts))))
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sleep := time.Duration(rand.Intn(upper)) * time.Millisecond
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time.Sleep(sleep)
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return int(sleep)
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}
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// mockCommitErrorEnable uses to enable `mockCommitError` and only mock error once.
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var mockCommitErrorEnable = int64(0)
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// MockCommitErrorEnable exports for gofail testing.
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func MockCommitErrorEnable() {
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atomic.StoreInt64(&mockCommitErrorEnable, 1)
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}
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// MockCommitErrorDisable exports for gofail testing.
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func MockCommitErrorDisable() {
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atomic.StoreInt64(&mockCommitErrorEnable, 0)
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}
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// IsMockCommitErrorEnable exports for gofail testing.
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func IsMockCommitErrorEnable() bool {
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return atomic.LoadInt64(&mockCommitErrorEnable) == 1
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}
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// TxnInfo is used to keep track the info of a committed transaction (mainly for diagnosis and testing)
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type TxnInfo struct {
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StartTS uint64 `json:"start_ts"`
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CommitTS uint64 `json:"commit_ts"`
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ErrMsg string `json:"error,omitempty"`
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}
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