[xDS] send eDS request directly if ClusterName is already known

[echo...@gmail.com]

hey folks,

We have an eDS control plane. we can create a client with service config like
```

"loadBalancingConfig": [

    {"eds_experimental": {"clusterName": xds_cluster_name}}

]

```

so that we can just get the ClusterLoadAssignment without obtaining Cluster by LDS, RDS.

However, xDS client sends ADS sequentially and has a 15s timeout. In our setup, the first LDS call blocked for 15s because the control plane does not talk in LDS. It's not good to spend 15s to init a client, so can we bypass first LDS call and send eDS if we already know the clusterName? or is there any other way around to reduce/remove this 15s wait?

Thanks,

yishu

[Yi-Shu Tai]

so the easiest way is implement the missing lDS, cDS endpoint

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戴翊書

Yi-Shu Tai

Software Engineer @Dropbox

[Easwar Swaminathan]

You should be able to directly use the EDS LB policy without having to use the LDS/RDS/CDS. Could you give us more info on your setup? And maybe file a question (or issue) in the language specific gRPC repo that you are using?

Thanks

Easwar

[Yi-Shu Tai]

Hi Easwar,

Thanks for the reply. Sorry I should be clear that I am using the grpc c++ client.

> You should be able to directly use the EDS LB policy without having to use the LDS/RDS/CDS.

Yes.  But the grpc client first issues a LDS request and waits for 15s timeout before sending eDS request. my question is is there a way around this 15s timeout? 

I thought for a bit it's hard to tell if the endpoint does not implement LDS or it's just very slow. Unless these are some options I missed in the service config or xDS bootstrap file.

In the end, I found it's easier to implement LDS, CDS.

Best,

yishu 

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