@Override
    public synchronized boolean init(final PlacementDriverOptions opts) {
        if (this.started) {
            LOG.info("[FakePlacementDriverClient] already started.");
            return true;
        }
        super.init(opts);
        LOG.info("[FakePlacementDriverClient] start successfully, options: {}.", opts);
        return this.started = true;
    }
Single raft group, no need for a real PD role.

@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/client/pd/FakePlacementDriverClient.java