zookeeper为树形结构，类似文件系统，每个节点称为znode:znode里可以存数据(最大1MB)，可以挂子znode
znode的名字以"/"开头，"/"为根节点。当一个znode挂点的时候，zookeeper是如何知道的？又是采取何种措施解决的呢？
大家讲道理2017-04-18 09:45:33
update: I read the wrong question, which means I don't know!
Didn't it mean that there is a heartbeat sensor? If I can't ping you, you must have died.
