### --- Impala的负载均衡~~~     Impala主要有三个组件，分别是statestore，catalog和impalad，
~~~     对于Impalad节点，每一个节点都可以接收客户端的查询请求，
~~~     并且对于连接到该Impalad的查询还要作为Coordinator节点(需要消耗⼀定的内存和CPU)存在，
~~~     为了保证每一个节点的资源开销的平衡需要对于集群中的Impalad节点做一下负载均衡

### --- Cloudera官方推荐的代理方案:HAProxy~~~     DNS做负载均衡
~~~     DNS做负载均衡方案是最简单的，但是性能一般，
~~~     所以这里我们按照官方的建议使用HAProxy实现负载均衡
~~~     生产中应该选择一个非Impalad节点作为HAProxy的安装节点

### --- 安装haproxy[root@linux123 ~]# yum install haproxy -y

### --- 配置文件[root@linux123 ~]# vim /etc/haproxy/haproxy.cfg
#具体配置内容#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
globallog 127.0.0.1 local2chroot /var/lib/haproxypidfile /var/run/haproxy.pidmaxconn 4000user haproxygroup haproxydaemon# turn on stats unix socketstats socket /var/lib/haproxy/stats#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaultsmode                            http                        #mode { tcp|http|health }，tcp 表示4层，http表示7层，health仅作为健康检查使⽤用log                             globaloption                          httplogoption                          dontlognull#option http-server-close#option forwardfor              except 127.0.0.0/8#option abortonclose                                        # 连接数过大自动关闭option                          redispatch                  # 如果失效则强制转换其他服务器retries                         3                           # 尝试3次失败则从集群摘除timeout http-request            10stimeout queue                   1m#timeout connect                10s#timeout client                 1m#timeout server                 1mtimeout connect                 1d                          # 连接超时间，重要，hive查询数据能返回结果的保证timeout client                  1d                          # 同上timeout server                  1d                          # 同上timeout http-keep-alive         10stimeout check                   10s                         # 健康检查时间maxconn                         3000                        # 最大连接数
listen status                                                   # 定义管理界面bind 0.0.0.0:1080                                       # 管理界面访问IP和端口mode http                                               # 管理界面所使用的协议option httplogmaxconn 5000                                            # 最大连接数stats refresh 30s                                       # 30秒自动刷新stats uri /statslisten impalashellbind 0.0.0.0:25003                                      # ha作为proxy所绑定的IP和端口mode tcp                                                # 以4层方式代理，重要option tcplogbalance roundrobin                                      # 调度算法 'leastconn' 最少连接数分配，或者 'roundrobin'，轮询分server impalashell_1 linux121:21000 checkserver impalashell_2 linux122:21000 checkserver impalashell_3 linux123:21000 checklisten impalajdbcbind 0.0.0.0:25004                                      # ha作为proxy所绑定的IP和端口mode tcp                                                # 以4层方式代方式，重要option tcplogbalance roundrobin                                      # 调度算法 'leastconn' 最少连接数分配，或者 'roundrobin'，轮询分server impalajdbc_1 linux121:21050 checkserver impalajdbc_2 linux122:21050 checkserver impalajdbc_3 linux122:21050 check#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:5000acl url_static       path_beg       -i /static /images /javascript /stylesheetsacl url_static       path_end       -i .jpg .gif .png .css .jsuse_backend static          if url_staticdefault_backend             app#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend staticbalance     roundrobinserver      static 127.0.0.1:4331 check#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend appbalance     roundrobinserver  app1 127.0.0.1:5001 checkserver  app2 127.0.0.1:5002 checkserver  app3 127.0.0.1:5003 checkserver  app4 127.0.0.1:5004 check

### --- 启动[root@linux123 ~]# systemctl start haproxy
[root@linux123 ~]# systemctl status haproxy
[root@linux123 ~]# systemctl stop haproxy
[root@linux123 ~]# systemctl restart haproxy

### --- 使用Impala-shell访问方式[root@linux123 ~]# impala-shell -i linux123:25003
[linux123:25003] >

~~~     # 使用起来十分方便，区别仅仅相当于是修改了一个ip地址和端口而已，其余不变。
~~~     Impala集群在操作过程中尽量多给内存，如果内存不能满足使用要求，
~~~     Impala的执行很可能会报错！！String driverUrl = "jdbc:hive2://linux123:25004/default;auth=noSasl";

### --- 打印输出D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=49425:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath 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com.yanqi.impala.jdbc.ImpalaTest
392456197008193000  张三  20  0
267456198006210000  李四  25  1
892456199007203000  王五  24  1
492456198712198000  赵六  26  2
392456197008193000  张三  20  0
392456197008193000  张三  20  0