Question about timeout detection at steaming

[Carfield Yim]

HI, I am a new user of grpc and using the steaming feature to let the server continue pushing update to client.

But there maybe case where somehow the server get some issue and the connection still there, so no exception, but just the update is not pushing. Can I detect this as timeout event? Or I have to start a thread at client side to check if the data keep pushing from server?

Thanks

[Makarand Dharmapurikar]

Which language is this in?

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[Carfield Yim]

Thanks, it is Java server and C# client, maybe Java client 

On Wednesday, March 22, 2017 at 1:20:31 PM UTC+8, Makarand Dharmapurikar wrote:

Which language is this in?

On Tue, Mar 21, 2017 at 7:58 PM, Carfield Yim <carf...@gmail.com> wrote:

HI, I am a new user of grpc and using the steaming feature to let the server continue pushing update to client.

But there maybe case where somehow the server get some issue and the connection still there, so no exception, but just the update is not pushing. Can I detect this as timeout event? Or I have to start a thread at client side to check if the data keep pushing from server?

Thanks

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[Kun Zhang]

The keep-alive feature can be helpful for detecting broken connection on the Java client.

Use OkHttpChannelBuilder.enableKeepAlive() or NettyChannelBuilder.enableKeepAlive() to turn it on.

However, the Netty keep-alive implementation is buggy as of 1.2.0 (https://github.com/grpc/grpc-java/issues/2828), and we are working on it.

Not sure if C# client has the same feature. I will leave it to the C core folks [+ctiller]

[Carfield Yim]

Can we use that? How if the Http is alive but there is no update, say the server is live but the data somehow no publishing, maybe just a bug at server that make the data stop published. Can we still use http status for that?

[Kun Zhang]

You shouldn't care about http status if you are using gRPC. gRPC has its own status space.

Like I said before, Java provides the keep-alive option, which allows the client to detect connectivity issue in a timely manner.

Of course you will need to find out first if it's due to a bug on the server.

[Carfield Yim]

oh, I see, so even if the server just don't get stuck, I should still get an exception at on error?

[Kun Zhang]

Ideally gRPC client library should detect the stuck connection and give you an error, which is what the keep-alive option tries to achieve.

[Carfield Yim]

Cool, thanks a lot, this is the sample code, right? https://github.com/grpc/grpc-java/issues/1648 And at the moment it is only for Java client, right?

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[Kun Zhang]

Not sure what code you are referring to. Use OkHttpChannelBuilder.enableKeepAlive() or NettyChannelBuilder.enableKeepAlive() to turn it on in Java.

Craig (cc'ed) should be able to answer for wrapped languages.

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