本文整理匯總了Golang中github.com/henryanand/vitess/go/vt/topo.ShardInfo.Cells方法的典型用法代碼示例。如果您正苦於以下問題：Golang ShardInfo.Cells方法的具體用法？Golang ShardInfo.Cells怎麽用？Golang ShardInfo.Cells使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/henryanand/vitess/go/vt/topo.ShardInfo的用法示例。
在下文中一共展示了ShardInfo.Cells方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: updateShardCellsAndMaster
// updateShardCellsAndMaster will update the 'Cells' and possibly
// MasterAlias records for the shard, if needed.
func (wr *Wrangler) updateShardCellsAndMaster(si *topo.ShardInfo, tabletAlias topo.TabletAlias, tabletType topo.TabletType, force bool) error {
// See if we need to update the Shard:
// - add the tablet's cell to the shard's Cells if needed
// - change the master if needed
shardUpdateRequired := false
if !si.HasCell(tabletAlias.Cell) {
shardUpdateRequired = true
}
if tabletType == topo.TYPE_MASTER && si.MasterAlias != tabletAlias {
shardUpdateRequired = true
}
if !shardUpdateRequired {
return nil
}
actionNode := actionnode.UpdateShard()
keyspace := si.Keyspace()
shard := si.ShardName()
lockPath, err := wr.lockShard(keyspace, shard, actionNode)
if err != nil {
return err
}
// re-read the shard with the lock
si, err = wr.ts.GetShard(keyspace, shard)
if err != nil {
return wr.unlockShard(keyspace, shard, actionNode, lockPath, err)
}
// update it
wasUpdated := false
if !si.HasCell(tabletAlias.Cell) {
si.Cells = append(si.Cells, tabletAlias.Cell)
wasUpdated = true
}
if tabletType == topo.TYPE_MASTER && si.MasterAlias != tabletAlias {
if !si.MasterAlias.IsZero() && !force {
return wr.unlockShard(keyspace, shard, actionNode, lockPath, fmt.Errorf("creating this tablet would override old master %v in shard %v/%v", si.MasterAlias, keyspace, shard))
}
si.MasterAlias = tabletAlias
wasUpdated = true
}
if wasUpdated {
// write it back
if err := topo.UpdateShard(context.TODO(), wr.ts, si); err != nil {
return wr.unlockShard(keyspace, shard, actionNode, lockPath, err)
}
}
// and unlock
return wr.unlockShard(keyspace, shard, actionNode, lockPath, err)
}