after log restore, there are many warning logs

[Leavrth]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. run log restore

2. What did you expect to see? (Required)

not many warning logs

3. What did you see instead (Required)

many warning logs

4. What is your TiDB version? (Required)

master

In the process of log restore, it would increase global schema version by 128 to trigger domain update.

tidb/br/pkg/restore/client.go

Lines 2852 to 2869 in 451bda4

	func (rc *Client) UpdateSchemaVersion(ctx context.Context) error {
	storage := rc.GetDomain().Store()
	var schemaVersion int64
	ctx = kv.WithInternalSourceType(ctx, kv.InternalTxnBR)
	if err := kv.RunInNewTxn(
	ctx,
	storage,
	true,
	func(ctx context.Context, txn kv.Transaction) error {
	t := meta.NewMeta(txn)
	var e error
	schemaVersion, e = t.GenSchemaVersions(128)
	return e
	},
	); err != nil {
	return errors.Trace(err)
	}

it needs to increase it by 100+ in order to trigger full-reload, instead of diff-reload.

tidb/domain/domain.go

Lines 233 to 235 in 451bda4

	if currentSchemaVersion != 0 && neededSchemaVersion > currentSchemaVersion && neededSchemaVersion-currentSchemaVersion < 100 {
	is, relatedChanges, err := do.tryLoadSchemaDiffs(m, currentSchemaVersion, neededSchemaVersion)
	if err == nil {

However, once we increase the schema version without any Diff: key, it would print warning log every time the domain reloads.

tidb/domain/domain.go

Lines 288 to 291 in 451bda4

	if data == nil || data.Info == nil || len(data.Info.Writes) == 0 {
	return 0, errors.Errorf("There is no Write MVCC info for the schema version")
	}
	return int64(data.Info.Writes[0].CommitTs), nil