private void stopReplicator(final Collection<PeerId> keep, final Collection<PeerId> drop) {
        if (drop != null) {
            for (final PeerId peer : drop) {
                if (!keep.contains(peer) && !peer.equals(this.serverId)) {
                    this.replicatorGroup.stopReplicator(peer);
                }
            }
        }
    }
Retrieve current configuration this node seen so far. It's not a reliable way to
retrieve cluster peers info, you should use {@link #listPeers()} instead.

@return current configuration.

@since 1.0.3
jraft-core/src/main/java/com/alipay/sofa/jraft/core/NodeImpl.java