HAProxy实现Impala的负载均衡
1.HAProxy安装及启停
1.1 在集群中选择一个节点，使用yum方式安装HAProxy服务
[root@data01-dev ~]# yum -y install haproxy
1.2 启动与停止HAProxy服务，并将服务添加到自启动列表
[root@data01-dev ~]# service haproxy start
[root@data01-dev ~]# service haproxy stop
[root@data01-dev ~]# chkconfig haproxy on
[root@data01-dev ~]# service haproxy status
Redirecting to /bin/systemctl status haproxy.service
● haproxy.service - HAProxy Load Balancer
Loaded: loaded (/usr/lib/systemd/system/haproxy.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2022-10-20 19:29:46 CST; 19h ago
Main PID: 27994 (haproxy-systemd)
CGroup: /system.slice/haproxy.service
├─27994 /usr/sbin/haproxy-systemd-wrapper -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid
├─27995 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
└─27996 /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
Oct 20 19:29:46 data01-dev systemd[1]: Started HAProxy Load Balancer.
Oct 20 19:29:46 data01-dev haproxy-systemd-wrapper[27994]: haproxy-systemd-wrapper: executing /usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /run/haproxy.pid -Ds
3.HAProxy配置Impala负载均衡
1.将/etc/haproxy目录下的haproxy.cfg文件备份，新建haproxy.cfg文件，添加如下配置
#---------------------------------------------------------------------
# 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
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
#option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main *:5000
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js
use_backend static if url_static
default_backend app
#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static
balance roundrobin
server static 127.0.0.1:4331 check
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
listen status
bind data01-dev:1080
mode http
option httplog
maxconn 5000
stats refresh 30s
stats uri /haproxy
stats enable
stats realm Global\ statistics
stats auth admin:admin
listen impala_shell data01-dev:25003
mode tcp
option tcplog
balance leastconn
#主机列表
server impala1 impala01-dev:21000
server impala2 impala02-dev:21000
server impala3 impala03-dev:21000
server impala4 data01-dev:21000
server impala5 data02-dev:21000
server impala6 data03-dev:21000
listen impala_jdbc data01-dev:25004
mode tcp
option tcplog
balance roundrobin
#主机列表
server impala1 impala01-dev:21050
server impala2 impala02-dev:21050
server impala3 impala03-dev:21050
server impala4 data01-dev:21050
server impala5 data02-dev:21050
server impala6 data03-dev:21050
log 127.0.0.1 local0 info
主要配置了HAProxy的http状态管理界面、impalashell和impalajdbc的负载均衡。
2. 重启HAProxy服务
[root@data01-dev haproxy]# service haproxy restart
3.浏览器访问
访问地址： http://{hostname}:1080/stats
4.Impala Shell测试
使用多个终端同时访问，并执行SQL语句，查看是否会通过HAProxy服务自动负载到其它Impala Daemon节点
1.使用Impala shell访问HAProxy服务的25003端口，命令如下
[root@data01-dev ~]# impala-shell -i data01-dev:25003
2.打开第一个终端访问并执行SQL
[root@data01-dev ~]# impala-shell -i data01-dev:25003
Starting Impala Shell without Kerberos authentication
Opened TCP connection to data01-dev:25003
Connected to data01-dev:25003
Server version: impalad version 3.2.0-cdh6.3.2 RELEASE (build 1bb9836227301b839a32c6bc230e35439d5984ac)
***********************************************************************************
Welcome to the Impala shell.
(Impala Shell v3.2.0-cdh6.3.2 (1bb9836) built on Fri Nov 8 07:22:06 PST 2019)
Want to know what version of Impala you're connected to? Run the VERSION command to
find out!
***********************************************************************************
[data01-dev:25003] default> select * from test_xac_tmp.xichuan_test limit 1;
Connection lost, reconnecting...
Opened TCP connection to data01-dev:25003
Query: select * from test_xac_tmp.xichuan_test limit 1
Query submitted at: 2022-10-21 14:46:20 (Coordinator: http://data02-dev:25000)
Query progress can be monitored at: http://data02-dev:25000/query_plan?query_id=074d7571e7cd831e:c2f9b34300000000
+----+-----------+------+
| id | continent | area |
+----+-----------+------+
| 1 | a | 1 |
+----+-----------+------+
Fetched 1 row(s) in 5.04s
3.同时打开第二个终端访问并执行SQL
[root@master01-dev ~]# impala-shell -i data01-dev:25003
Starting Impala Shell without Kerberos authentication
Opened TCP connection to data01-dev:25003
Connected to data01-dev:25003
Server version: impalad version 3.2.0-cdh6.3.2 RELEASE (build 1bb9836227301b839a32c6bc230e35439d5984ac)
***********************************************************************************
Welcome to the Impala shell.
(Impala Shell v3.2.0-cdh6.3.2 (1bb9836) built on Fri Nov 8 07:22:06 PST 2019)
You can change the Impala daemon that you're connected to by using the CONNECT
command.To see how Impala will plan to run your query without actually executing
it, use the EXPLAIN command. You can change the level of detail in the EXPLAIN
output by setting the EXPLAIN_LEVEL query option.
***********************************************************************************
[data01-dev:25003] default> select * from test_xac_tmp.xichuan_test limit 1;
Connection lost, reconnecting...
Opened TCP connection to data01-dev:25003
Query: select * from test_xac_tmp.xichuan_test limit 1
Query submitted at: 2022-10-21 14:46:26 (Coordinator: http://data03-dev:25000)
Query progress can be monitored at: http://data03-dev:25000/query_plan?query_id=c740bb9f6d8c326f:d585881000000000
+----+-----------+------+
| id | continent | area |
+----+-----------+------+
| 1 | a | 1 |
+----+-----------+------+
Fetched 1 row(s) in 0.03s
通过以上测试可以看到，两个终端执行的SQL不在同一个Impala Daemon，这样就实现了Impala Daemon服务的负载均衡。
5.Impala JDBC测试
这里Java的测试工程就不详细描述如何创建了文章来源：https://www.toymoban.com/news/detail-685854.html
配置JDBC的地址为HAProxy服务所在的IP端口为25004文章来源地址https://www.toymoban.com/news/detail-685854.html
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