待处理日志格式如下：

[totalCount: 298006556, count: 287347623, queryCount: 259027994, exeCount: 28319629, totalQPS: 10000.0, QPS: 1.0, queryQPS: 1.0, exeQPS: 0.0]
[totalCount: 298006556, count: 287347623, queryCount: 259027994, exeCount: 28319629, totalQPS: 20000.0, QPS: 1.0, queryQPS: 1.0, exeQPS: 0.0]
[totalCount: 298006556, count: 287347623, queryCount: 259027994, exeCount: 28319629, totalQPS: 40000.0, QPS: 1.0, queryQPS: 1.0, exeQPS: 0.0]
[totalCount: 298006556, count: 287347623, queryCount: 259027994, exeCount: 28319629, totalQPS: 100000.0, QPS: 1.0, queryQPS: 1.0, exeQPS: 0.0]

目标是得到每条记录的总QPS，即totalQPS

1、安装logstash。

2、编写logstash处理配置文件，创建一个test.conf文件，内容如下：

input {
     file {
        path => "/home/vagrant/logstash/logstash-2.2.2/dbpool-logs/dev/test.log"
        start_position => "beginning"
    }
}
filter {
       grok {
           match => { "message" => "\[%{USERNAME}\: %{INT:totalCount}\, %{USERNAME}\: %{INT:count}\, %{USERNAME}\: %{INT:queryCount}\, %{USERNAME}\: %{INT:exeCount}\, %{USERNAME}\: %{BASE10NUM:totalQPS}\, %{USERNAME}\: %{BASE10NUM:QPS}\, %{USERNAME}\: %{BASE10NUM:queryQPS}\, %{USERNAME}\: %{BASE10NUM:exeQPS}\]" }
      }
}
output {
    if "_grokparsefailure" in [tags] {
    }else{
        file {
             path => "/home/vagrant/logstash/logstash-2.2.2/dbpool-logs/dev/test-%{+yyyy-MM-dd}.log"
             message_format => "总QPS为%{totalQPS}"
        }
    }
}

• 指定输入日志为/home/vagrant/logstash/logstash-2.2.2/dbpool-logs/dev/test.log。

• filter为按照日志格式的匹配过滤规则。

• 最后以一定的格式输出到/home/vagrant/logstash/logstash-2.2.2/dbpool-logs/dev/test-%{+yyyy-MM-dd}.log。

3、启动logstash开始处理，./bin/logstash -f conf/test.conf

4、处理后生成文件test-xxx.log，内容为：

总QPS为10000.0
总QPS为20000.0
总QPS为40000.0
总QPS为100000.0

5、后面如果有日志继续写入test.log则会将解析结果追加到test-xxxx.log文件中。