connection retry

[SamYuan1990]

Is your proposal related to a problem?

Some time fails create connection between tape and peer.

Describe the solution you'd like

add a general 3 times retry for connection creation before error.

Describe alternatives you've considered

N/A

Additional context

N/A

[stone-ch]

Would connection retry cost more time when calculate the tps?

[SamYuan1990]

Would connection retry cost more time when calculate the tps?

no， just retry to set up connection.
Tape works as set up connection and send test data.
the calculation starts form data send.

[guoger]

this looks good to me

[SamYuan1990]

https://github.com/grpc/grpc-go/blob/02cd07d9bb5609fe76f8bb8d948037e79a8b29c7/examples/features/retry/README.md

https://github.com/hyperledger/fabric/blob/master/internal/pkg/comm/client.go#L178

for my understanding... it seems that fabric client code invokes grpc from it's vendor folder.
which is a/an old version of grpc code which doesn't support retry feature in latest grpc?

@guoger

[guoger]

• we could always retry at application layer, or
• we could always switch to latest grpc-go if necessary

[SamYuan1990]

ok, let's make it at application layer.