GetNextId in ZK component throw zk: node does not exist

[zhenjunMa]

What happened:

when I call GetNextId API in layotto that use zookeeper as its component, I got an error, zk: node does not exist, as below:

What you expected to happen:

Get a unique ID

How to reproduce it (as minimally and precisely as possible):

1. start a zookeeper server, maybe use docker
2. start layotto server, maybe execute this command: ./layotto start -c configs/config_zookeeper.json
3. start a client to call GetNextId, maybe as follows:

cli, err := client.NewClientWithAddress("127.0.0.1:34904")
resp, err := cli.GetNextId(ctx, &runtimev1pb.GetNextIdRequest{
	StoreName: "sequencer_demo",
	Key:       sequencerKey,
})

Anything else we need to know?:

solution A:
we can add a method createOrUpdate to implement the logic that create a zk node when it doesn't exist or update it directly.

solution B:
add a method isExist to check if the request node has been created

[bxiiiiii]

方法的实现在这个文件里面进行吗

[zhenjunMa]

@bxiiiiii 不能在这里加，不然别人用不了，一个是你在我上面那个接口里面加，一个是你可以在GetNextId的实现里面不直接Set 而是先判断一下是否存在再set