为什么根目录节点不存在，而zookeeper实例中存在根目录下的节点？

Question

我是运行独立模式下的 zookeeper 实例又名 IA，试图升级到仲裁模式，然后我准备了另外 2 个带有空快照目录的 zookeeper 实例（IB 和 IC），首先修改 zoo.cfg在3个实例中正确，并分别创建了myid，先重启独立实例IA，然后再启动其他2个。

IB和IC的情况是，他们有数据，但是没有根目录：

IB 和 IC：

[zk: localhost:2181(CONNECTED) 14] ls /
Node does not exist: /
[zk: localhost:2181(CONNECTED) 15] ls /zookeeper
[quota]
[zk: localhost:2181(CONNECTED) 16]

此外，IB中有数据丢失：

[zk: localhost:2181(CONNECTED) 16] get /demo/version

cZxid = 0x30000006c
ctime = Thu Dec 22 17:49:13 CST 2016
mZxid = 0x30000006c
mtime = Thu Dec 22 17:49:13 CST 2016
pZxid = 0x6003792a0
cversion = 12764622
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 135794
[zk: localhost:2181(CONNECTED) 17]

IA 看起来像：

[zk: localhost:2181(CONNECTED) 10] get /demo/version

cZxid = 0x30000006c
ctime = Thu Dec 22 17:49:13 CST 2016
mZxid = 0x30000006c
mtime = Thu Dec 22 17:49:13 CST 2016
pZxid = 0x6003792a0
cversion = 12312921
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 587495
[zk: localhost:2181(CONNECTED) 11]

IC 看起来像：

[zk: localhost:2181(CONNECTED) 10] get /demo/version

cZxid = 0x30000006c
ctime = Thu Dec 22 17:49:13 CST 2016
mZxid = 0x30000006c
mtime = Thu Dec 22 17:49:13 CST 2016
pZxid = 0x6003792a0
cversion = 12312921
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 587495
[zk: localhost:2181(CONNECTED) 11]

顺便说一句，状态很好：

IA:

[shell@kernel /data/zookeeper/zookeeper-3.4.8/bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /data/zookeeper/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: follower

IB:

[shell@kernel /data/zookeeper/zookeeper-3.4.8/bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /data/zookeeper/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: follower

集成电路：

[shell@kernel /data/zookeeper/zookeeper-3.4.8/bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /data/zookeeper/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: leader

如上图，版本为

3.4.8

提前致谢

Answer 1

我设法通过将 initLimit 和 syncLimit 分别更改为 100 和 50 来解决此问题，tickTime 仍然是 2000]，然后从standalone模式迁移到quorum模式，稍等片刻，一切正常。

为什么根目录节点不存在，而zookeeper实例中存在根目录下的节点？

Why root directory node does not exist while nodes under root directory exist in zookeeper instance?

apache-zookeeper