I can think of a few ways to achieve this (with keepalives configured ofcourse). One way to detect this would be to perform a `Read()` on the stream. If the channel dies, the stream would die too and the read would fail.
On Tuesday, November 16, 2021 at 3:08:46 AM UTC-8 paulin...@gmail.com wrote: > Hi all, > > During client side streaming, I'd like to know how the client could detect > that the server process has been abruptly restarted (e.g. due to some > critical failure), and how the client could recover from this. > > Apparently for server side streaming we can use IsCancelled() and > AsyncNotifyWhenDone() to detect such issues. But is there any similar > mechanism on the client side? > > This is what I have tested so far: > > > 1. *I started a synchronous client side streaming RPC. *The channel is > in a GRPC_CHANNEL_READY state > 2. *Killed the server process.* After the server dies, the channel is > briefly GRPC_CHANNEL_IDLE. Then the channel started alternating between > GRPC_CHANNEL_CONNECTING and GRPC_CHANNEL_TRANSIENT_FAILURE > 3. *Then the server is started again. *Тhe channel then goes in a > GRPC_CHANNEL_READY state. However, the server no longer receives any of > the > streamed messages. I suppose at this stage the client should start a new > RPC and abandon the old one? But how would the client know that it has to > do this? *Is there a reliable way for the client to know that it has > to re-establish the connection?* > > I attempted to detect the issue using the retval of WaitForConnected() and > Write() but both of these functions returned “true” while the server was > down. > > Also, I tried setting these configuration variables on both the server and > client, but it didn't seem to help: > > args.SetInt(GRPC_ARG_KEEPALIVE_TIME_MS, 10000); > > args.SetInt(GRPC_ARG_KEEPALIVE_TIMEOUT_MS, 5000); > > args.SetInt(GRPC_ARG_KEEPALIVE_PERMIT_WITHOUT_CALLS, 1); > > args.SetInt(GRPC_ARG_HTTP2_MAX_PINGS_WITHOUT_DATA, 0); > > Regards, > > Paulin > -- You received this message because you are subscribed to the Google Groups "grpc.io" group. To unsubscribe from this group and stop receiving emails from it, send an email to grpc-io+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/grpc-io/66a022e7-638d-4441-b532-1fa3589c441cn%40googlegroups.com.
