[seckill] log issue

[Alice52]

• [x] log exception info

• [x] log request

• [x] console or debug API to change runtime log level

• [x] log async

  • stackoverflow-issue
  • maxFlushTime: 60 * 1000
  • includeCallerData: false
  • queueSize: qps * io time
  • discardingThreshold: set to 0 for lossless data
  • neverBlock: false

  <configuration>
      <appender name="FILE" class="ch.qos.logback.core.FileAppender">
          <file>myapp.log</file>
          <encoder>
              <pattern>%logger{35} - %msg%n</pattern>
          </encoder>
      </appender>
  
      <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender">
          <!-- appender-ref just can only one -->
          <appender-ref ref="FILE" />
      </appender>
  
      <root level="DEBUG">
          <appender-ref ref="ASYNC" />
      </root>
  </configuration>