Netty server doesn't send multiple GOAWAYs during graceful shutdown

[ejona86]

For full graceful shutdown, we should send one GOAWAY with last-steam-id=MAX_INT and a PING. When the PING ACK is received then we send another GOAWAY with the actual last-stream-id. We can choose to set a timer for if the PING ACK doesn't arrive back promptly.

It looks like we try to do shutdown gracefully with maxConnectionAge, but it seems like it may not actually function.

[ejona86]

The same applies to maxConnectionIdle

[dapengzhang0]

If the PING ACK doesn't arrive back promptly, do we still send another GOAWAY with the actual last-stream-id at the timer timeout?

[ejona86]

@dapengzhang0, yes, always send another GOAWAY with the actual last-stream-id. That prevents creating further streams.