コード例 #1
0
ファイル: ddl_worker.go プロジェクト: XuHuaiyu/tidb
func (d *ddl) checkOwner(t *meta.Meta, flag JobType) (*model.Owner, error) {
	var owner *model.Owner
	var err error

	switch flag {
	case ddlJobFlag:
		owner, err = t.GetDDLJobOwner()
	case bgJobFlag:
		owner, err = t.GetBgJobOwner()
	default:
		err = errInvalidJobFlag
	}
	if err != nil {
		return nil, errors.Trace(err)
	}

	if owner == nil {
		owner = &model.Owner{}
		// try to set onwer
		owner.OwnerID = d.uuid
	}

	now := time.Now().UnixNano()
	// we must wait 2 * lease time to guarantee other servers update the schema,
	// the owner will update its owner status every 2 * lease time, so here we use
	// 4 * lease to check its timeout.
	maxTimeout := int64(4 * d.lease)
	if owner.OwnerID == d.uuid || now-owner.LastUpdateTS > maxTimeout {
		owner.OwnerID = d.uuid
		owner.LastUpdateTS = now
		// update status.
		switch flag {
		case ddlJobFlag:
			err = t.SetDDLJobOwner(owner)
		case bgJobFlag:
			err = t.SetBgJobOwner(owner)
		}
		if err != nil {
			return nil, errors.Trace(err)
		}
		log.Debugf("[ddl] become %s job owner %s", flag, owner.OwnerID)
	}

	if owner.OwnerID != d.uuid {
		log.Debugf("[ddl] not %s job owner, owner is %s", flag, owner.OwnerID)
		return nil, errors.Trace(errNotOwner)
	}

	return owner, nil
}
コード例 #2
0
ファイル: ddl_worker.go プロジェクト: jmptrader/tidb
func (d *ddl) checkOwner(t *meta.Meta, flag JobType) (*model.Owner, error) {
	owner, err := d.getJobOwner(t, flag)
	if err != nil {
		return nil, errors.Trace(err)
	}
	if owner == nil {
		owner = &model.Owner{}
		// try to set onwer
		owner.OwnerID = d.uuid
	}

	now := time.Now().UnixNano()
	maxTimeout := d.getCheckOwnerTimeout(flag)
	sub := now - owner.LastUpdateTS
	if owner.OwnerID == d.uuid || sub > maxTimeout {
		owner.OwnerID = d.uuid
		owner.LastUpdateTS = now
		// update status.
		switch flag {
		case ddlJobFlag:
			err = t.SetDDLJobOwner(owner)
		case bgJobFlag:
			err = t.SetBgJobOwner(owner)
		}
		if err != nil {
			return nil, errors.Trace(err)
		}
		log.Debugf("[ddl] become %s job owner, owner is %s sub %vs", flag, owner, sub/1e9)
	}

	if owner.OwnerID != d.uuid {
		log.Debugf("[ddl] not %s job owner, self id %s owner is %s", flag, d.uuid, owner.OwnerID)
		return nil, errors.Trace(errNotOwner)
	}

	return owner, nil
}