Apache zookeeper 如何使用zookeeper java api-s添加子节点

我是zookeeper的新手，尝试使用zookeeper java API创建ZNode

znode的结构是这样的--

/MyConfig/txndb/ /MyConfig/txndb/

如果我试试这个--

它正在成功创建/MyConfig节点。但是如果我用这个--

这个例外是失败的--

我做错了什么？感谢你的指点

zk.create("/MyConfig", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

zk.create("/MyConfig/txnDb/abc123", new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);

Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /MyConfig/txnDb/abc123
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
    at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)
    at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:1733)
    at com.olp.config.core.ZkUtil.createZkNode(ZkUtil.java:117)
    ... 33 more