- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

} else {
                        threadPoolExecutor.setMaximumPoolSize(threads);
                        if (core == max) {
                            threadPoolExecutor.setCorePoolSize(threads);
                        }
                    }
                }
            }
        } catch (Throwable t) {
            logger.error(t.getMessage(), t);
        }
    }
    @Override
    public ScheduledExecutorService nextScheduledExecutor() {
        return scheduledExecutors.pollItem();
    }
    @Override
    public ExecutorService nextExecutorExecutor() {
        return executorServiceRing.pollItem();
    }
    @Override
    public ScheduledExecutorService getServiceExporterExecutor() {
        return serviceExporterExecutor;
    }
    @Override
    public ScheduledExecutorService getRegistryNotificationExecutor() {
        return registryNotificationExecutor;
    }
    public ScheduledExecutorService getServiceDiscoveryAddressNotificationExecutor() {
        return serviceDiscveryAddressNotificationExecutor;