zookeeper_init
时间: 2023-10-19 14:07:11 浏览: 40
zookeeper_init是一个ZooKeeper C客户端API函数,用于初始化ZooKeeper客户端库并连接到ZooKeeper服务器。它的原型如下:
```c
zhandle_t *zookeeper_init(const char *host, watcher_fn watcher, int recv_timeout, const clientid_t *clientid, void *context, int flags);
```
其中,参数含义如下:
- `host`:ZooKeeper服务器的主机名和端口号,多个服务器之间用逗号分隔,例如"server1:2181,server2:2181,server3:2181"。
- `watcher`:一个回调函数,用于处理ZooKeeper事件通知。
- `recv_timeout`:客户端接收超时时间,单位为毫秒。
- `clientid`:客户端ID,如果为NULL,则表示创建一个新的客户端ID。
- `context`:用户上下文数据,将在回调函数中传递给用户。
- `flags`:标志位,目前只支持设置为0。
函数返回一个`zhandle_t`类型的指针,表示一个ZooKeeper客户端句柄。如果初始化失败,则返回NULL。
相关问题
zookeeperAPI
Zookeeper API是Zookeeper提供的一组API,用于实现分布式应用程序的协调和管理。以下是Zookeeper API的一些常见用法:
1.创建一个目录节点
```python
import zookeeper
zk = zookeeper.init("localhost:2181")
path = "/test"
value = "hello"
zookeeper.create(zk, path, value, [], zookeeper.EPHEMERAL)
```
2.获取一个目录节点的值
```python
import zookeeper
zk = zookeeper.init("localhost:2181")
path = "/test"
(stat, value) = zookeeper.get(zk, path, None)
print("Node value: %s" % value)
```
3.设置一个目录节点的值
```python
import zookeeper
zk = zookeeper.init("localhost:2181")
path = "/test"
value = "world"
zookeeper.set(zk, path, value)
```
4.删除一个目录节点
```python
import zookeeper
zk = zookeeper.init("localhost:2181")
path = "/test"
zookeeper.delete(zk, path)
```
zookeeper设置开机自启
以下是设置zookeeper开机自启的步骤:
1. 打开终端并以root用户身份登录到服务器。
2. 进入zookeeper的init.d目录:
```shell
cd /etc/init.d
```
3. 创建一个名为zookeeper的启动脚本:
```shell
vi zookeeper
```
4. 在启动脚本中添加以下内容:
```shell
#!/bin/bash
#
# zookeeper: Starts the zookeeper daemon
#
# chkconfig: 345 99 01
# description: Zookeeper is a distributed coordination service
# Source function library.
. /etc/init.d/functions
# Set environment variables
ZOOKEEPER_HOME=/usr/local/zookeeper-3.4.5
# Start zookeeper
start() {
echo -n "Starting zookeeper: "
su -c "$ZOOKEEPER_HOME/bin/zkServer.sh start" zookeeper
echo "OK"
}
# Stop zookeeper
stop() {
echo -n "Stopping zookeeper: "
su -c "$ZOOKEEPER_HOME/bin/zkServer.sh stop" zookeeper
echo "OK"
}
# Restart zookeeper
restart() {
stop
start
}
# Check zookeeper status
status() {
echo -n "Zookeeper status: "
su -c "$ZOOKEEPER_HOME/bin/zkServer.sh status" zookeeper
}
# Main logic
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
status)
status
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit 0
```
5. 保存并退出编辑器。
6. 授予启动脚本执行权限:
```shell
chmod +x zookeeper
```
7. 将zookeeper添加到开机自启列表:
```shell
chkconfig --add zookeeper
```
8. 设置zookeeper开机自启:
```shell
chkconfig zookeeper on
```
9. 现在,您可以使用以下命令来启动、停止、重启和检查zookeeper的状态:
```shell
service zookeeper start
service zookeeper stop
service zookeeper restart
service zookeeper status
```