Assert.assertEquals(first, CanalEventUtils.createPosition(entrys.get(0)));
Assert.assertEquals(lastest, CanalEventUtils.createPosition(entrys.get(entrys.size() - 1)));
// 全部ack掉
eventStore.cleanUntil(entrys2.getPositionRange().getEnd());
// 最后就拿不到数据
Events<Event> entrys3 = eventStore.tryGet(entrys1.getPositionRange().getEnd(), bufferSize);
System.out.println("third get size : " + entrys3.getEvents().size());
Assert.assertEquals(0, entrys3.getEvents().size());