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[数据库]分布式架构中一致性解决方案——Zookeeper集群搭建


  当我们的项目在不知不觉中做大了之后,各种问题就出来了,真jb头疼,比如性能,业务系统的并行计算的一致性协调问题,比如分布式架构的事务问题,

我们需要多台机器共同commit事务,经典的案例当然是银行转账,支付宝转账这种,如果是一台机器的话,这个还是很方便的,windows中自带了一个事务协

调器mstsc,但是呢,你那种很大很牛逼的项目不可能全是windows服务器,对吧,有些人为了解决这个问题,会采用2pc,3pc这种算法,或者是paxos的思

想进行分布式下的一致性处理,当然在这个世界上,真的不需要你自己去开发这种协调性,因为现在已经有了专门解决这种问题的解决方案,比如zookeeper。

 

一:zookeeper集群搭建

  有些人应该明白,zookeeper正是google的chubby的开源实现,使用zookeeper之前,我们先来搭建一个集群。

1. 下载

   从官网上,我们可以看到,zookeeper的最新版本是3.4.8,下载地址是:http://apache.fayea.com/zookeeper/zookeeper-3.4.8/,可以下载一下:

 

2. 文件夹配置

接下来我们解压一下,根目录为zkcluster,下面使用clientport(3000,3001,3002)这样的端口作为文件夹名称,里面就是zookeeper解压包,如下面这样:

 

3. 配置zoo.cfg

   现在我们有三个文件夹,也就是3个zookeeper程序,在3001/conf/下面有一个zoo_sample.cfg文件,现在我们改成zoo.cfg,并且修改如下:

# The number of milliseconds of each ticktickTime=2000# The number of ticks that the initial # synchronization phase can takeinitLimit=10# The number of ticks that can pass between # sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just # example sakes.dataDir=/root/zkcluster/3001/datadataLogDir=/root/zkcluster/3001/logs# the port at which the clients will connectclientPort=3001# the maximum number of client connections.# increase this if you need to handle more clients#maxClientCnxns=6## Be sure to read the maintenance section of the # administrator guide before turning on autopurge.## http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance## The number of snapshots to retain in dataDir#autopurge.snapRetainCount=3# Purge task interval in hours# Set to "0" to disable auto purge feature#autopurge.purgeInterval=1server.1=192.168.161.134:2888:3888server.2=192.168.161.134:2889:3889server.3=192.168.161.134:2890:3890

这里我们要注意的是,红色的部分分别就是:指定zookeeper的data和log文件夹,指定clientport访问的端口和servers的列表。

 

4. 生成pid文件

    我们在servers列表中,可以看到有server.1 ,server.2, server.3 三个字符串,生成pid文件的内容就取决如此,比如server.1的地址,

我们的pid文件里面就是1,不过要知道的是,pid文件要在data目录下,比如下面这样:

 

ok,同样的道理,3002和3003的文件夹同3001就可以了,比如他们的zoo.cfg如下:

 

--------  3002 --------------

# The number of milliseconds of each ticktickTime=2000# The number of ticks that the initial # synchronization phase can takeinitLimit=10# The number of ticks that can pass between # sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just # example sakes.dataDir=/root/zkcluster/3002/datadataLogDir=/root/zkcluster/3002/logs# the port at which the clients will connectclientPort=3002# the maximum number of client connections.# increase this if you need to handle more clients#maxClientCnxns=6## Be sure to read the maintenance section of the # administrator guide before turning on autopurge.## http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance## The number of snapshots to retain in dataDir#autopurge.snapRetainCount=3# Purge task interval in hours# Set to "0" to disable auto purge feature#autopurge.purgeInterval=1server.1=192.168.161.134:2888:3888server.2=192.168.161.134:2889:3889server.3=192.168.161.134:2890:3890

 

--------  3003 --------------

# The number of milliseconds of each ticktickTime=2000# The number of ticks that the initial # synchronization phase can takeinitLimit=10# The number of ticks that can pass between # sending a request and getting an acknowledgementsyncLimit=5# the directory where the snapshot is stored.# do not use /tmp for storage, /tmp here is just # example sakes.dataDir=/root/zkcluster/3003/datadataLogDir=/root/zkcluster/3003/logs# the port at which the clients will connectclientPort=3003# the maximum number of client connections.# increase this if you need to handle more clients#maxClientCnxns=6## Be sure to read the maintenance section of the # administrator guide before turning on autopurge.## http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance## The number of snapshots to retain in dataDir#autopurge.snapRetainCount=3# Purge task interval in hours# Set to "0" to disable auto purge feature#autopurge.purgeInterval=1server.1=192.168.161.134:2888:3888server.2=192.168.161.134:2889:3889server.3=192.168.161.134:2890:3890

 

5. 启动各自服务器

    到现在为止,我们各个zookeeper程序的配置都结束了,接下来我们到各自目录的bin目录下,通过zkServer.sh来进行启动,比如下面这样:

ok,接下来我们来开始启动,通过如下命令即可:

./zkServer.sh start-foreground

 

现在我们都启动了,接下来我们可以用命令看下哪个server是leader,哪些是follower。。。

[root@localhost bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /root/zkcluster/3001/bin/../conf/zoo.cfgMode: follower[root@localhost bin]# [root@localhost bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /root/zkcluster/3002/bin/../conf/zoo.cfgMode: leader[root@localhost bin]# [root@localhost bin]# ./zkServer.sh statusZooKeeper JMX enabled by defaultUsing config: /root/zkcluster/3003/bin/../conf/zoo.cfgMode: follower[root@localhost bin]# 

到目前为止,我们的服务端操作都ok啦,,,是不是好吊。。。

 

二:驱动下载

1.  java的驱动就方便了,直接在源代码中就提供了,直接copy一下lib文件夹中的jar包就ok了,真是tmd的方便。

 

2. 用C#驱动的也不要太烦,要使用也是不难的,我们可以通过nuget下载一下就可以了,转换过来的版本也是3.4.8的最新版本,比如下面这样:

 

好了,大概就说这么多,希望对你有帮助~~~