test

            if (client) {

                try {

                    auto &cmtx = g_Cluster->getClientMutex();

                    // Use try_to_lock: this runs under the exclusive backend

                    // lock, so any blocking here starves shared readers and

                    // causes "backend shared lock timeout" on other threads.

                    std::unique_lock<std::timed_mutex> lock(cmtx, std::try_to_lock);

                    // Brief wait (200ms) to let short operations finish, but

                    // not long enough to starve shared readers (5s timeout).

                    std::unique_lock<std::timed_mutex> lock(cmtx, std::chrono::milliseconds(200));

                    if (lock.owns_lock()) {

                        peer_data = client->retrieve(dgid);

                        _LastPeerFetch = now;