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
}
func (d *ddl) getJobOwner(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
}
return owner, errors.Trace(err)
}