logback 每天生成和大小生成 衝突 TimeBasedRollingPolicy SizeBasedTriggeringPolicy

項目使用了logback，日誌打印需要按照每天和大小生成日誌，於是使用了TimeBasedRollingPolicy SizeBasedTriggeringPolicy

<appender name="FILE"  class="ch.qos.logback.core.rolling.RollingFileAppender">
		<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
			<FileNamePattern>${LOG_HOME}/consumer.%d{yyyy-MM-dd_HH}.log</FileNamePattern>
			<!-- 日誌文件保留天數 -->
			<MaxHistory>30</MaxHistory>
		</rollingPolicy>
		<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
			<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
		</encoder>
		<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <!-- 文件大小觸發重寫新文件 -->
			<MaxFileSize>10MB</MaxFileSize>
		</triggeringPolicy>
	</appender>

但是在實際使用中並未有按照預期根據日期和大小生成日誌，查了了相關文章說是TimeBasedRollingPolicy和SizeBasedTriggeringPolicy衝突，在根據網上的資料去看了logback的官網地址https://logback.qos.ch/manual/appenders.html#SizeAndTimeBasedFNATP，在遊覽了之後發現了最重要的部分

Size and time based rolling policy

Sometimes you may wish to archive files essentially by date but at the same time limit the size of each log file, in particular if post-processing tools impose size limits on the log files. In order to address this requirement, logback ships with SizeAndTimeBasedRollingPolicy.

Note that TimeBasedRollingPolicy already allows limiting the combined size of archived log files. If you only wish to limit the combined size of log archives, then TimeBasedRollingPolicy described above and setting the totalSizeCap property should be amply sufficent.

Here is a sample configuration file demonstrating time and size based log file archiving.

Example: Sample configuration for SizeAndTimeBasedFNATP (logback-examples/src/main/resources/chapters/appenders/conf/logback-sizeAndTime.xml)

View as .groovy
<configuration>
  <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>mylog.txt</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
      <!-- rollover daily -->
      <fileNamePattern>mylog-%d{yyyy-MM-dd}.%i.txt</fileNamePattern>
       <!-- each file should be at most 100MB, keep 60 days worth of history, but at most 20GB -->
       <maxFileSize>100MB</maxFileSize>    
       <maxHistory>60</maxHistory>
       <totalSizeCap>20GB</totalSizeCap>
    </rollingPolicy>
    <encoder>
      <pattern>%msg%n</pattern>
    </encoder>
  </appender>


  <root level="DEBUG">
    <appender-ref ref="ROLLING" />
  </root>

</configuration>

然後就發現logback還有一個SizeAndTimeBasedRollingPolicy，所以根據官網修改我的配置文件爲

	<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
		<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
			<!-- rollover daily -->
			<fileNamePattern>${LOG_HOME}/consumer.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
			<!-- each file should be at most 100MB, keep 60 days worth of history, but at most 20GB -->
			<maxFileSize>50MB</maxFileSize>
			<maxHistory>30</maxHistory>
		</rollingPolicy>
		<encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
			<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
		</encoder>
	</appender>

然後就ok了，日誌文件中的%d、%i是不可缺少的。