woaishixiaoxiao opened a new issue, #1178:
URL: https://github.com/apache/rocketmq-clients/issues/1178
### Before Creating the Enhancement Request
- [x] I have confirmed that this should be classified as an enhancement
rather than a bug/feature.
### Programming Language of the Client
Go
### Summary
Replace per-message goroutines in SendAsync with bounded async execution
using existing SimpleThreadPool
### Motivation
## Problem
Currently, `Producer.SendAsync()` create a new goroutine for every message:
```
go func() {
resp, err := p.send0(ctx, msgs, false)
f(ctx, resp, err)
}()
```
Under high load or when the RocketMQ broker is slow/unresponsive, this can
lead to:
- Unbounded goroutine growth
- Memory exhaustion (OOM)
### Describe the Solution You'd Like
reuse the existing SimpleThreadPool in SendAsync that:
- Is lazily initialized on first SendAsync call
- Limits max concurrent sends
- Uses a bounded queue to buffer pending tasks
- Rejects new tasks gracefully when queue is full
### Describe Alternatives You've Considered
- Prevents goroutine leaks and OOM under load
- Provides predictable resource usage
- Enables backpressure when broker is slow
- Configurable to fit different workload profiles
### Additional Context
_No response_
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