[java] Grpc Client concurrent requests go missing

[Ankur Chauhan]

Hi,

I am integrating my gRPC service with another system that intends to send multiple requests to the gRPC server. I expect to send multiple request concurrently to the backend server. I created a single client instance (blocking stub) and was attempting to share this single request amongst all requests that get send to the server. But it seems like some of the requests get "lost" :-| As per logging, 20 requests get started at the client but the server only gets (as per logging) 16 requests. The behavior is pretty consistent.

Can the client be shared amongst requests? Am I missing something about the way the client is to be used or maybe a configuration parameter that I missed?

[Ankur Chauhan]

Adding more context:

I turned off parallel request behavior of the client an everything seems to work fine. I am using the grpc client inside a grails web application and executing multiple requests in parallel with a gpars in a forkJoinPool.

-- AC

[Eric Anderson]

Since you mentioned Grails, I'll assume you are using grpc-java. v0.13.0 had a bug which could lose RPCs, which was fixed in v0.13.1. Does it sound like you could be running into that problem?

In grpc-java, it is safe to use the same stub and channel multiple times, even across threads.

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[Ankur Chauhan]

Thanks Eric, that was it. I updated it and all was better.

— Ankur Chauhan