@Override
        public void onError(final PeerId peer, final Status status) {
            LOG.info("Replicator has errors");
        }
Test rollback stateMachine with readIndex for issue 317:
https://github.com/sofastack/sofa-jraft/issues/317
jraft-extension/java-log-storage-impl/src/test/java/com/alipay/sofa/jraft/core/NodeTest.java