java Logback 仅根据文件大小回滚
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28509787/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Logback roll only on file size
提问by Josh
I am using logback 1.0.13. I want my log file to roll solely based off of file size. If this takes 2 hours or 2 years, I don't care. I am having trouble figuring out how to do so. My appender is configured like so:
我正在使用 logback 1.0.13。我希望我的日志文件仅根据文件大小滚动。如果这需要 2 小时或 2 年，我不在乎。我很难弄清楚如何做到这一点。我的 appender 配置如下：
<appender name="serverFaultFile"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>/folder/to/log/file.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>/folder/to/log/file-%d{yyyy-MM}.%i.log</fileNamePattern>
<MaxHistory>2</MaxHistory>
<cleanHistoryOnStart>true</cleanHistoryOnStart>
<timeBasedFileNamingAndTriggeringPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>10MB</maxFileSize>
<MaxHistory>9</MaxHistory>
</timeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>
<encoder>
<pattern>[%p] [%d{ISO8601}] [%c] [%m]%n</pattern>
</encoder>
</appender>
This solution rolls monthly, which isn't what I need. I tried completely dropping the -%d{dateformat} modifier, but then the file was never even created/logged to. I tried modifiers %G and %yyyy, but monthly was as fine grained as logback would apparently allow me to get (see this bug report). What am I missing?
这个解决方案每月滚动一次，这不是我需要的。我尝试完全删除 -%d{dateformat} 修饰符，但是该文件甚至从未被创建/记录到。我尝试了修饰符 %G 和 %yyyy，但每月的粒度与 logback 显然允许我获得一样细粒度（请参阅此错误报告）。我错过了什么？
回答by sheltem
You want a SizeBasedTriggeringPolicy: http://logback.qos.ch/manual/appenders.html#SizeBasedTriggeringPolicy, probably combined with a FixedWindowRollingPolicy.
您需要 SizeBasedTriggeringPolicy：http://logback.qos.ch/manual/appenders.html#SizeBasedTriggeringPolicy ，可能与 FixedWindowRollingPolicy 结合使用。
Was a comment before, not sure it deserves it's own answer, but here it is. ;)
之前是评论，不确定它是否值得自己回答，但现在是。;)
回答by mike rodent
Just to expand on sheltem's answer:
只是为了扩展 Sheltem 的答案：
From my experiments, you have to use both a FixedWindowRollingPolicyand a SizedBasedTriggeringPolicy, as documented here. It appears that you can't use a SizedBasedTriggeringPolicywith a SizeAndTimeBasedRollingPolicy, for example: in my case logging then failed to happen.
根据我的实验，您必须同时使用 aFixedWindowRollingPolicy和 a SizedBasedTriggeringPolicy，如此处所述。似乎您不能将 aSizedBasedTriggeringPolicy与a一起使用SizeAndTimeBasedRollingPolicy，例如：在我的情况下，日志记录失败。
Typical example in your xml file might be:
您的 xml 文件中的典型示例可能是：
<appender name="FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>../logs/MyProject/testrolling.html</file>
<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
<fileNamePattern>../logs/MyProject/backup%i.htm
</fileNamePattern>
<minIndex>1</minIndex>
<maxIndex>10</maxIndex>
</rollingPolicy>
<triggeringPolicy
class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
<maxFileSize>5MB</maxFileSize>
</triggeringPolicy>
<encoder class="...
Your backup files will then be called: backup1.htm, backup2.htm, etc.
您的备份文件将被称为：backup1.htm、backup2.htm 等。
It would appear that you cannot include a "%d" formatting directive in the fileNamePattern: I tried and logging failed to happen. However, according to the documentation you must include the "%i" formatting directive, which makes sense.
看起来您不能在以下内容中包含“%d”格式指令fileNamePattern：我尝试过，但日志记录失败。但是，根据文档，您必须包含“%i”格式指令，这是有道理的。
much later
很久以后
This may be me being naive, but I'd have thought a logging app should be designed to produce output by default, i.e. always interpret directives so that something at least is produced, rather than nothing.
这可能是我太天真了，但我原以为日志应用程序应该设计为默认生成输出，即始终解释指令，以便至少生成一些东西，而不是什么都不生成。
