querynode unknown return type warn

[rere950303]

• milvus version: v2.3.12
• mode: cluster

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When inserting data, we’re seeing a large number of warning logs like the ones below from both the querynode and proxy.
Do you happen to know the cause? Is it safe to ignore them?

[grpcclient/client.go:514] ["unknown return type"] [traceID=c5e35cbecc7bc8be169b6f82997c7a82] [client_role=querynode-80] [return="{\"ClientStream\":{\"ClientStream\":{}}}"]

It doesn't seem to have any functional issues when viewed through attu.

[rere950303]

@yhmo thanks for your works!
could you check this issue plz,,, 🙏

[yhmo]

This log is printed from here:

milvus/internal/util/grpcclient/client.go

Line 514 in 50bfde9

log.Warn("unknown return type", zap.Any("return", ret))

It calls a remote rpc interface in a retry loop and checks if the returned result is a commonpb.Status or not.
It returns nil after this log is printed, which means it is not an error, the remote rpc is successfully called.
So, I think you can ignore it.