solrcloud，tomcat，外部zookeeper配置详解

之前由于在项目中使用的solr3.6，服务器总是莫名其妙的挂掉，各种解决未果，于是尝试换到solr4，想试试solrcloud和zookeeper集群看看效果怎么样，实际效果比3.6稳定很多，下面说一下项目中我们的具体现在一个测试的配置。我们配置3台zookper服务器和3台solr服务器，由于没有多台机器测试，zookeeper的集群都在一台服务器上，tomcat部署在3台服务器上。

zookeeper是什么
ZooKeeper 顾名思义动物园管理员，他是拿来管大象(Hadoop) 、蜜蜂(Hive) 、小猪(Pig) 的管理员， Apache Hbase和 Apache Solr 以及LinkedIn sensei 等项目中都采用到了 Zookeeper。ZooKeeper是一个分布式的，开放源码的分布式应用程序协调服务，ZooKeeper是以Fast Paxos算法为基础，实现同步服务，配置维护和命名服务等分布式应用。
zookeeper安装及配置
zookeeper配置
（1）解压为zookeeper[plain] view plaincopyprint?tar -xf -C /home/myuser/zookeeper/

tar -xf -C /home/myuser/zookeeper/复制zookeeper文件夹3份，分别重名名为zookeeperA，zookeeperB，zookeeperC。
并且创建数据快照以及日志存放文件夹，命名为zooA，zooB，zooC。
（2）编辑对应的zookeeper配置文件，复制zookeeperconf下zoo_sample.cfg为zoo.cfg
[plain]
cd /home/myuser/zookeeperA/conf
cp zoo_sample.cfg zoo.cfg

cd /home/myuser/zookeeperA/conf
cp zoo_sample.cfg zoo.cfg   （3）修改zoo.cfg
[html]
# 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=/home/myuser/zooA/data
# the port at which the clients will connect
clientPort=2181
# ZooKeeper server and its port no. # ZooKeeper ensemble should know about every other machine in the ensemble # specify server id by creating 'myid' file in the dataDir # use hostname instead of IP address for convenient maintenance
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2988:3988
server.3=127.0.0.1:2088:3088
#
# 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
dataLogDir=/home/myuser/zooA/log

# 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=/home/myuser/zooA/data
# the port at which the clients will connect
clientPort=2181
# ZooKeeper server and its port no. # ZooKeeper ensemble should know about every other machine in the ensemble # specify server id by creating 'myid' file in the dataDir # use hostname instead of IP address for convenient maintenance
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2988:3988
server.3=127.0.0.1:2088:3088
#
# 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
dataLogDir=/home/myuser/zooA/logtickTime：心跳时间，为了确保连接存在的，以毫秒为单位，最小超时时间为两个心跳时间
initLimit：多少个心跳时间内，允许其他server连接并初始化数据，如果ZooKeeper管理的数据较大，则应相应增大这个值
clientPort：服务的监听端口
dataDir：用于存放内存数据库快照的文件夹，同时用于集群的myid文件也存在这个文件夹里（注意：一个配置文件只能包含一个dataDir字样，即使它被注释掉了。）
dataLogDir：用于单独设置transaction log的目录，transaction log分离可以避免和普通log还有快照的竞争

syncLimit：多少个tickTime内，允许follower同步，如果follower落后太多，则会被丢弃。
（4）创建myid文件
[plain]
cd /home/myuser/zooA/data
sudo sh -c 'echo "1" >> myid'

cd /home/myuser/zooA/data
sudo sh -c 'echo "1" >> myid' 其他文件夹类似创建myid文件，zookeeperB为2，zookeeperC为3
（5）启动zookeeper
[plain]
cd /home/myuser/zookeeperA/bin
sudo sh zkServer.sh start

cd /home/myuser/zookeeperA/bin
sudo sh zkServer.sh start查看zookeeper状态[plain] view plaincopyprint?[root@weibo bin]# sh zkServer.sh status
JMX enabled by default
Using config: /home/weibo/zookeeperA/bin/../conf/zoo.cfg
Mode: follower

[root@weibo bin]# sh zkServer.sh status
JMX enabled by default
Using config: /home/weibo/zookeeperA/bin/../conf/zoo.cfg
Mode: follower启动OK，依次启动另外两台zookeeper，启动第一台zookeeper后，你可以观察bin下的zookeeper.out可以看到报错，connection refused，没有关系，zookeeper需要等待其他另个节点的加入，全部启动之后就正常了。
（6）客户端连接zookeeper
[plain]
[root@weibo bin]# sh zkCli.sh
Connecting to localhost:2181
2013-05-10 15:00:25,363 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
2013-05-10 15:00:25,369 [myid:] - INFO [main:Environment@100] - Client environment:host.name=localhost
2013-05-10 15:00:25,370 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.6.0_33
2013-05-10 15:00:25,371 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Sun Microsystems Inc.
2013-05-10 15:00:25,372 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/home/weibo/jdk1.6.0_33/jre
2013-05-10 15:00:25,373 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/home/weibo/zookeeperA/bin/../build/classes:/home/weibo/zookeeperA/bin/../build/lib/*.jar:/home/weibo/zookeeperA/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/weibo/zookeeperA/bin/../lib/slf4j-api-1.6.1.jar:/home/weibo/zookeeperA/bin/../lib/netty-3.2.2.Final.jar:/home/weibo/zookeeperA/bin/../lib/log4j-1.2.15.jar:/home/weibo/zookeeperA/bin/../lib/jline-0.9.94.jar:/home/weibo/zookeeperA/bin/../zookeeper-3.4.5.jar:/home/weibo/zookeeperA/bin/../src/java/lib/*.jar:/home/weibo/zookeeperA/bin/../conf:/home/weibo/jdk1.6.0_33/lib:.
2013-05-10 15:00:25,373 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/home/weibo/jdk1.6.0_33/jre/lib/amd64/server:/home/weibo/jdk1.6.0_33/jre/lib/amd64:/home/weibo/jdk1.6.0_33/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2013-05-10 15:00:25,374 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2013-05-10 15:00:25,375 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2013-05-10 15:00:25,375 [myid:] - INFO [main:Environ

补充：综合编程 , 其他综合 ,