private void updateHandler(final String selectorId, final List<CommonUpstream> upstreamList, final List<CommonUpstream> successList) {
        //No node changes, including zombie node resurrection and live node death
        if (successList.size() == upstreamList.size() && PENDING_SYNC.isEmpty()) {
            return;
        }
        removePendingSync(successList);
        if (!successList.isEmpty()) {
            UPSTREAM_MAP.put(selectorId, successList);
            updateSelectorHandler(selectorId, successList);
        } else {
            UPSTREAM_MAP.remove(selectorId);
            updateSelectorHandler(selectorId, new ArrayList<>());
        }
    }
Replace.

@param selectorId      the selector name
@param commonUpstreams the common upstream list
shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/UpstreamCheckService.java