Aias00 opened a new issue, #6559:
URL: https://github.com/apache/shenyu/issues/6559
## Description
`for (String server : serverList) { i++; try {
RegisterUtils.doRegister(...); } catch (Exception e) { LOGGER.error(...); if (i
== serverList.size()) { throw new RuntimeException(e); } } }`. The
`FailbackRegistryRepository.persist*` wrapper only enrolls a failure for retry
when `doPersist*` throws. If an *intermediate* server fails but a later server
succeeds, no exception is thrown, so no failback task is created. The failed
intermediate server never receives that registration/heartbeat.
## Location
```
shenyu-register-client-http/.../HttpClientRegisterRepository.java:191-210
(doRegister), 212-230 (doHeartbeat)
```
## Impact
In multi-cluster deployments (the code comment at line 202 explicitly
contemplates multiple clusters), partial registration loss that the failback
mechanism never recovers.
## Suggested fix
Track per-server failure and throw if *any* server failed (or enroll a
per-server failback task), rather than gating the throw on `i ==
serverList.size()`.
## Related existing issue(s)
None
_Identified during the 2026-08-02 audit; full list in
[`docs/issue-candidates-2026-08-02.md`](docs/issue-candidates-2026-08-02.md)._
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