private void checkPeers(final List<PeerId> peers) {
        Requires.requireNonNull(peers, "Null peers");
        Requires.requireTrue(!peers.isEmpty(), "Empty peers");
        for (final PeerId peer : peers) {
            Requires.requireNonNull(peer, "Null 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