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store/tikv: use latest PD TS plus one as min commit ts #24579

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merged 2 commits into from
May 13, 2021
Merged

store/tikv: use latest PD TS plus one as min commit ts #24579

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store/tikv: use latest PD TS plus one as min commit ts
sticnarf May 12, 2021
6a60a01
Merge branch 'master' into better-min-commit-ts
ti-chi-bot May 13, 2021
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7 changes: 4 additions & 3 deletions store/tikv/2pc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -992,17 +992,18 @@ func (c *twoPhaseCommitter) execute(ctx context.Context) (err error) {
// If we want to use async commit or 1PC and also want linearizability across
// all nodes, we have to make sure the commit TS of this transaction is greater
// than the snapshot TS of all existent readers. So we get a new timestamp
// from PD as our MinCommitTS.
// from PD and plus one as our MinCommitTS.
if commitTSMayBeCalculated && c.needLinearizability() {
failpoint.Inject("getMinCommitTSFromTSO", nil)
minCommitTS, err := c.store.oracle.GetTimestamp(ctx, &oracle.Option{TxnScope: oracle.GlobalTxnScope})
latestTS, err := c.store.oracle.GetTimestamp(ctx, &oracle.Option{TxnScope: oracle.GlobalTxnScope})
// If we fail to get a timestamp from PD, we just propagate the failure
// instead of falling back to the normal 2PC because a normal 2PC will
// also be likely to fail due to the same timestamp issue.
if err != nil {
return errors.Trace(err)
}
c.minCommitTS = minCommitTS
// Plus 1 to avoid producing the same commit TS with previously committed transactions
c.minCommitTS = latestTS + 1
}
// Calculate maxCommitTS if necessary
if commitTSMayBeCalculated {
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