本文次要记录一个 zookeeper node 详细信息的各项参数的含意
官网文档: ZooKeeper Stat Structure
| 参数 | 解释 | 中文解读 |
|---|---|---|
| czxid | The zxid of the change that caused this znode to be created. | 批改这个节点时的 zxid 号 |
| mzxid | The zxid of the change that last modified this znode. | 批改这个节点时的 zxid 号 |
| pzxid | The zxid of the change that last modified children of this znode. | 批改这个节点给它增加子节点时的 zxid 号 |
| ctime | The time in milliseconds from epoch when this znode was created. | 节点的创立工夫 |
| mtime | The time in milliseconds from epoch when this znode was last modified. | 节点的批改工夫 |
| version | The number of changes to the data of this znode. | 节点变更的版本号 |
| cversion | The number of changes to the children of this znode. | 该节点的子节点的更新次数 |
| aversion | The number of changes to the ACL of this znode. | 这个节点的 ACL 的变更次数 |
| ephemeralOwner | The session id of the owner of this znode if the znode is an ephemeral node. If it is not an ephemeral node, it will be zero. | 如果是长期节点，那么创立这个节点的 session id 号 |
| dataLength | The length of the data field of this znode. | 这个节点的数据的长度 |
| numChildren | The number of children of this znode. | 这个节点的子节点数量 |
代码演示
[zk: localhost:2181(CONNECTED) 3] create /p1 thinktik
Created /p1
[zk: localhost:2181(CONNECTED) 4] stat /p1
cZxid = 0x58
ctime = Mon Feb 15 23:42:57 CST 2021
mZxid = 0x58
mtime = Mon Feb 15 23:42:57 CST 2021
pZxid = 0x58
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0 # 非长期节点的值固定为 0x0，长期节点会有 seesion id
dataLength = 8 # 该节点的长度为为 8，也是就 thinktik 的长度
numChildren = 0 # 子节点个数为 0
[zk: localhost:2181(CONNECTED) 5] create /p1/s1 think
Created /p1/s1
[zk: localhost:2181(CONNECTED) 6] stat /p1
cZxid = 0x58
ctime = Mon Feb 15 23:42:57 CST 2021
mZxid = 0x58
mtime = Mon Feb 15 23:42:57 CST 2021
pZxid = 0x59 # 子节点被创立时的 zxid
cversion = 1 # 子节点批改了 1 次
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 1 # 子节点个数为 1
[zk: localhost:2181(CONNECTED) 11] create /p1/s2 think2
Created /p1/s2
[zk: localhost:2181(CONNECTED) 12] stat /p1
cZxid = 0x58
ctime = Mon Feb 15 23:42:57 CST 2021
mZxid = 0x58
mtime = Mon Feb 15 23:42:57 CST 2021
pZxid = 0x5c
cversion = 2 # 子节点批改了 2 次
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 2 # 子节点个数为 2 实际上的官网文档和代码演示有轻微的区别，然而区别不大
本文原创链接: zookeeper 节点信息解读