When I get the CANCELLED with "HTTP/2 error code: CANCEL" on server-side streaming?

[Jaeyong Cho]

Hi!

I've got the CANCELLED(description: HTTP/2 error code: CANCEL) when the client is receiving messages from server. And this is intermittent error.

It never occurred when just one-to-one server-to-client-streaming. This happens only when multiple servers and clients are server-to-client-streaming at the same time.

To fix the problem, I have the following questions:

- Could tell us which part you suspect? 

- Could you explain the description of error(HTTP/2 error code: CANCEL)? 

Client: grpc-java 

Server: grpc msvc c++

grpcVersion: 1.0.0

protobufVersion: 3.0.2

Please advise. Thanks.

Joe

[Carl Mastrangelo]

Cancelled can happen in a number of cases described here: https://github.com/grpc/grpc/blob/master/doc/statuscodes.md

Usually we only use cancel when an endpoint actually did cancel the request.  Can you provide more detail about what you are doing?

[zon...@gmail.com]

Sometimes happens when calling stream reaches a timeout and gets closed. Can be a sign of low performance due to insufficient memory or CPU available.