Java 什么是zookeeper端口及其用途？
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what is zookeeper port and its usage?
提问by agpt
I am quite new for zookeeper port through which I am coming across from past few days.
I introduced with zookeeper portkeyword at two occasion:
我对zookeeper端口很陌生，我过去几天通过它遇到。
我在两个场合引入了zookeeper port关键字：
- while configuring neo4j db cluster (link) and
- while running compiled voltdb catalog (link) (See Network Configuration Arguments)
Then, I came across Apache Zookeeper, (which I guess is related to distributed application, I am a newbie in distributed application as well). hence question came in my mind:
然后，我遇到了Apache Zookeeper，（我猜这与分布式应用程序有关，我也是分布式应用程序的新手）。因此我想到了一个问题：
- is there any implementation of apache zookeeper in above 2 scenarios ?
- What exactly this zookeeper port do internally ?
- 在上述 2 个场景中是否有 apache zookeeper 的任何实现？
- 这个zookeeper端口到底在内部做什么？
Any help would be appreciated, Thanks.
任何帮助将不胜感激，谢谢。
采纳答案by Sandeep Das
Zookeeper is used in distributed applications mainly for configuration management and high availability operations. Zookeeper does this by a Master-Slave architecture. Neo4j and VoltDb might be using zookeeper for this purpose
Zookeeper 在分布式应用中主要用于配置管理和高可用操作。Zookeeper 通过主从架构来做到这一点。Neo4j 和 VoltDb 可能为此使用 zookeeper
Coming to the ports understanding : suppose u have 3 servers for zookeepers ... You need to mention in configuration as
进入端口理解：假设你有 3 个用于动物园管理员的服务器......你需要在配置中提到
clientPort=2181
server.1=zookeeper1:2888:3888
server.2=zookeeper2:2888:3888
server.3=zookeeper3:2888:3888
Out of these one server will be the master and rest all will be slaves.If any server goes OFF then zookeeper elects leader automatically .
其中一台服务器将是主服务器，其余服务器都是从服务器。如果任何服务器关闭，那么zookeeper 会自动选举领导者。
Servers listen on three ports: 2181 for client connections; 2888 for follower connections, if they are the leader; and 3888 for other server connections during the leader election phase .
服务器监听三个端口：2181 用于客户端连接；2888 用于追随者连接，如果他们是领导者；和 3888 用于领导选举阶段的其他服务器连接。
