grpc-java: support graceful server shutdown

[michael...@fanduel.com]

Hello,

When we redeploy our servers on AWS, behind an ELB we would like to support graceful shutdown by pushing a GOAWAY frame to the already connected clients and initiate a graceful shutdown of the clients connection to the server. After some amount of time after the GOAWAY frame has prompted shutdown we would like the clients to re-establish a connection with the servers. 

I see this sort of behaviour implemented in the GO server https://github.com/grpc/grpc-go/pull/774

Is this also implemented in the grpc-java server (a link to the code would be appreciated) ?

Also, we plan to implement a scheduled DNS name resolver for updating our ELB DNS with the appropriate TTL https://github.com/grpc/grpc-java/issues/2514 , will the GOAWAY frame behaviour above effect a scheduled DNS name resolver?

Thanks,

Mike

[Makarand Dharmapurikar]

Both Java and C based clients will respect GOAWAY frames, in that a GOAWAY will induce the client to use a different connection for the following requests. Will defer to others for DNS resolver interaction.

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[michael...@fanduel.com]

Thank you Makarand.

Does this imply that a grpc-java server emits a GOAWAY frame on shutdown, i.e. on jvm closure?

On Thursday, December 22, 2016 at 8:57:32 PM UTC, Makarand Dharmapurikar wrote:

Both Java and C based clients will respect GOAWAY frames, in that a GOAWAY will induce the client to use a different connection for the following requests. Will defer to others for DNS resolver interaction.

On Thu, Dec 22, 2016 at 7:21 AM, <michael...@fanduel.com> wrote:

Hello,

When we redeploy our servers on AWS, behind an ELB we would like to support graceful shutdown by pushing a GOAWAY frame to the already connected clients and initiate a graceful shutdown of the clients connection to the server. After some amount of time after the GOAWAY frame has prompted shutdown we would like the clients to re-establish a connection with the servers. 

I see this sort of behaviour implemented in the GO server https://github.com/grpc/grpc-go/pull/774

Is this also implemented in the grpc-java server (a link to the code would be appreciated) ?

Also, we plan to implement a scheduled DNS name resolver for updating our ELB DNS with the appropriate TTL https://github.com/grpc/grpc-java/issues/2514 , will the GOAWAY frame behaviour above effect a scheduled DNS name resolver?

Thanks,

Mike

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[Carl Mastrangelo]

Google treats JVM shutdown as a more immediate action to take, while GOAWAY is not as urgent.  At least in our cases, the JVM shutting down (i.e. code run from Runtime.addShutdownHook) implies that everything should be destroyed asap.  

I think what you want is to shutdown the gRPC server and all connections before initiating a full jvm shutdown.  That would have the desired behavior you want, and wouldn't conflate the two shutdowns.