Does GRPC-java reuse SSL connections

[Robin Anil]

We are having poor latencies with Google PubSub since switching over to GRPC. 

See the discussion https://github.com/GoogleCloudPlatform/google-cloud-java/issues/1338#issuecomment-256443717

and https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/cloud-pubsub-discuss/jE92Hbc2JbY/LEzfxlfPCAAJ

What is the low latency way of connecting using GRPC to connect to Pubsub over https that is onpar with doing connection reuse with SSL connections?

Create a new channel and stub per request?

Pre-create stubs with each channel and round-robin per request?

I have tried both and I can never get to the p90 performance of the old library

Robin

[Carl Mastrangelo]

A channel will reuse connections.  ManagedChannels are expensive to create, but stubs are basically free.  

Can you describe what your latency goals are?  gRPC Java on a closed loop is approximately 300 microseconds @50th, and 500 microseconds @99th. 

[Louis Ryan]

Using a single channel is usually the right choice until you hit a certain level of traffic.

What is your aggregate QPS of calls here and total bandwidth?

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