本文整理汇总了Golang中github.com/pingcap/tidb/meta.Meta.GetDDLOwner方法的典型用法代码示例。如果您正苦于以下问题：Golang Meta.GetDDLOwner方法的具体用法？Golang Meta.GetDDLOwner怎么用？Golang Meta.GetDDLOwner使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/pingcap/tidb/meta.Meta的用法示例。
在下文中一共展示了Meta.GetDDLOwner方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: checkOwner
func (d *ddl) checkOwner(t *meta.Meta) (*model.Owner, error) {
owner, err := t.GetDDLOwner()
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.
if err = t.SetDDLOwner(owner); err != nil {
return nil, errors.Trace(err)
}
log.Debugf("become owner %s", owner.OwnerID)
}
if owner.OwnerID != d.uuid {
log.Debugf("not owner, owner is %s", owner.OwnerID)
return nil, errors.Trace(ErrNotOwner)
}
return owner, nil
}示例2: verifyOwner
func (d *ddl) verifyOwner(t *meta.Meta) error {
owner, err := t.GetDDLOwner()
if err != nil {
return errors.Trace(err)
}
if owner == nil {
owner = &model.Owner{}
// try to set onwer
owner.OwnerID = d.uuid
}
now := time.Now().Unix()
maxTimeout := int64(4 * d.lease)
if owner.OwnerID == d.uuid || now-owner.LastUpdateTS > maxTimeout {
owner.OwnerID = d.uuid
owner.LastUpdateTS = now
// update or try to set itself as owner.
if err = t.SetDDLOwner(owner); err != nil {
return errors.Trace(err)
}
}
if owner.OwnerID != d.uuid {
return errors.Trace(ErrNotOwner)
}
return nil
}