Linux巩固记录 Hbase环境准备-zookeeper安装

Posted 2020-10-06 肖哥哥  changw.xiao@qq.

Hbase是运行在hadoop之上，所以请参考第3篇文章搭建好一个master，两个slave的hadoop环境，我采用的版本为hadoop2.7.4

不了解Hbase的同学可以参考下这篇文章，分析得相当深刻，感谢作者 http://blog.csdn.net/u010270403/article/details/51648462

 

为啥在安装Hbase前需要安装zookeeper？

1，hbase regionserver 向zookeeper注册，提供hbase regionserver状态信息（是否在线）

2，hmaster启动时候会将hbase 系统表-ROOT- 加载到 zookeeper cluster，通过zookeeper cluster可以获取当前系统表.META.的存储所对应的regionserver信息。

注意：zookeeper集群节点最少3台，这样才能满足选举规则，少数服从多数

 

忘了讲一个问题

集群中，所有节点的时间同步非常重要，所以要将所有节点的时间设置为一样，

当然，手动设置时间肯定不行，需要用到ntp来自动同步

#设置时区为上海
cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime


#安装ntp
yum -y install ntp

# 同步时间
ntpdate pool.ntp.org


#确认时间是否正确
date

 

 

现在master节点上配置，配置好后复制到两个slave节点就好了

wget http://mirror.bit.edu.cn/apache/zookeeper/current/zookeeper-3.4.10.tar.gz

tar -zxvf zookeeper-3.4.10.tar.gz 

#进入conf目录
cp -p zoo_sample.cfg zoo.cfg

#编辑cfg文件
vi zoo.cfg

#内容修改为如下

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/tmp/zookeeper
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# 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=1

server.1=master:2888:3888
server.2=slave1:2888:3888
server.3=slave2:2888:3888

#master
echo "1" > /tmp/zookeeper/myid

#slave1
echo "2" > /tmp/zookeeper/myid

#slave2
echo "3" > /tmp/zookeeper/myid

#启动
/home/zookeeper-3.4.10/bin/zkServer.sh start /home/zookeeper-3.4.10/conf/zoo.cfg 

#状态查看
[[email protected] conf]# /home/zookeeper-3.4.10/bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /home/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower
[[email protected] conf]# 


#如果启动失败，查看日志
less zookeeper.out

#停止服务
[[email protected] conf]# /home/zookeeper-3.4.10/bin/zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /home/zookeeper-3.4.10/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[[email protected] conf]# jps
3589 Jps
[[email protected] conf]# 

找到leader节点，并停掉，你会发现刚开始为follower的某个节点又变为leader了

 

至此zookeeper配置完成