Oxidaner opened a new pull request, #3234:
URL: https://github.com/apache/dubbo-go/pull/3234
## What kind of change does this PR introduce?
- [x] Feature
## What is the current behavior?
Related Issue: #1977
## What is the new behavior?
This PR adds graceful shutdown enhancement with the following features:
1. **Exponential backoff retry for active notification**
- When sending notification to consumers fails, the server will retry with
exponential backoff
- Default: 500ms → 1s → 2s, max 3 retries
2. **Active awareness via connection error detection**
- Client detects connection errors (EOF, broken pipe, gRPC closing, http2
closing)
- Marks the invoker as closing to avoid routing requests to unavailable
instances
3. **Closing flag in response**
- Server adds closing flag in response attachment
- Client checks this flag to detect closing state
4. **Protocol-level graceful shutdown callback**
- Added `SetGracefulShutdownCallback` for protocol-specific shutdown logic
- gRPC protocol uses this for `GracefulStop()`
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