@Override
                public void run(final Status status) {
                    cbs.add("apply");
                    latch.countDown();
                }
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