How to Prevent Intermittent \"Transport is Closing\" Errors in gRPC?

Intermittent RPC Unavailable Error in gRPC Setup

When setting up gRPC clients and servers, it's crucial to consider the potential for abrupt TCP connection closures without proper notification to either party. This can lead to the infamous "transport is closing" error.

To avoid this issue, the underlying TCP socket's grace period can be managed by adjusting the KeepaliveParams on the server. For example:

grpc.NewServer(
    grpc.KeepaliveParams(keepalive.ServerParameters{
        MaxConnectionIdle: 5 * time.Minute, // This resolves the issue
    }),
)

By setting MaxConnectionIdle to a specific value, the server will proactively close the TCP connection before the kernel or intermediary load balancers/reverse proxies time out. This ensures a graceful closure, preventing the "transport is closing" error.

This solution not only eliminates the intermittent error but also mitigates the impact of connection leaks on server-side resources. The combination of proactive connection management and a well-defined keepalive policy ensures a reliable and scalable gRPC setup.

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