gRPC KeepAlive
keep-alive settings
Here are some good settings for an initial configuration of a SpringBoot FactCast client/server setup in case you ran into gRPC related client server communication troubles.
Sending keep-alive HTTP/2 PINGs on the connection is useful in case you are running on infrastructure that doesn’t support configurable idle timeouts, and therefore closes connections.
The proposed values are defining a scenario where the client sends keep-alive HTTP/2 PINGs every 300s and the server accepts this behavior without sending
GO_AWAY ENHANCE_YOUR_CALMto the client. Please adapt to your specific needs.
Client side
| Property | Description | Recommended | Default |
|---|---|---|---|
spring.grpc.client.channel.factstore.keepalive.time | The default delay before sending keepAlives. Please note that shorter intervals increase the network burden for the server. | 300 | 60 |
spring.grpc.client.channel.factstore.keepalive.without-calls | Configures whether keepAlive will be performed when there are no outstanding RPCs on a connection. | true | false |
Further details can be found here : org.springframework.grpc.autoconfigure.client.GrpcClientProperties.
Server side
| Property | Description | Recommended | Default |
|---|---|---|---|
spring.grpc.server.keepalive.permit.without-calls | Configures whether clients are allowed to send keep-alive HTTP/2 PINGs even if there are no outstanding RPCs on the connection. | true | false |
spring.grpc.server.keepalive.permit.time | Specifies the most aggressive keep-alive time in seconds clients are permitted to configure. | 100 | 300 |
Further details can be found here : org.springframework.grpc.autoconfigure.server.GrpcServerProperties.