Aias00 opened a new issue, #6500:
URL: https://github.com/apache/shenyu/issues/6500
### Current Behavior
Eureka instance watch polling can stop permanently after one polling error.
`EurekaInstanceRegisterRepository.watchInstances()` schedules a fixed-rate
polling task. The task catches exceptions, logs them, and then rethrows as
`ShenyuException`:
```java
ScheduledFuture<?> scheduledFuture = executorService.scheduleAtFixedRate(()
-> {
try {
...
} catch (Exception e) {
LOGGER.error("eureka registry eurekaDiscoveryService watch key: {}
error", key, e);
throw new ShenyuException(e);
}
}, 0, 1, TimeUnit.SECONDS);
```
An exception escaping a `ScheduledThreadPoolExecutor` periodic task
suppresses subsequent executions. So a single transient Eureka client error can
stop future instance polling for that watched key.
### Expected Behavior
Eureka watch polling should log transient errors and retry in the next
scheduled interval without letting exceptions escape the periodic task.
### Impact
After one polling error, instance add/delete changes for the watched service
can stop propagating until the watcher is recreated or the process restarts.
### Code Location
-
`shenyu-registry/shenyu-registry-eureka/src/main/java/org/apache/shenyu/registry/eureka/EurekaInstanceRegisterRepository.java`
- `watchInstances()` rethrows from inside the scheduled polling task.
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