java - 如何找出阻止 FileAppender 正常滚动的原因

Question

更新:有趣的是，我只看到以下问题发生在 Windows 环境中，但在部署的每个 Linux 环境中都工作正常。

我有一个带有 Log4j 1.2.17 和 fileAppender 的 Spring 应用程序 (3.2)，这是配置

log4j.rootCategory=TRACE, ROL

log4j.appender.ROL=org.apache.log4j.RollingFileAppender
log4j.appender.ROL.Encoding=UTF-8
log4j.appender.ROL.File=C:/logs/spring-app/application-log4j.log
log4j.appender.ROL.MaxFileSize=10000KB
log4j.appender.ROL.MaxBackupIndex=10
log4j.appender.ROL.layout=org.apache.log4j.PatternLayout
log4j.appender.ROL.layout.ConversionPattern=%d -- %p -- %c -- %m%n

由于某种原因，我发现日志文件有时会停止滚动并且变得非常大，因此我添加了 log4j Debug模式

-Dlog4j.debug

我发现以下问题作为症状

这是日志记录过程正常工作的时候

log4j: rolling over count=10332832
log4j: maxBackupIndex=10
log4j: Renaming file C:\logs\spring-app\application-log4j.log.9 to C:\logs\spring-app\application-log4j.log.10
log4j: Renaming file C:\logs\spring-app\application-log4j.log.8 to C:\logs\spring-app\application-log4j.log.9
log4j: Renaming file C:\logs\spring-app\application-log4j.log.7 to C:\logs\spring-app\application-log4j.log.8
log4j: Renaming file C:\logs\spring-app\application-log4j.log.6 to C:\logs\spring-app\application-log4j.log.7
log4j: Renaming file C:\logs\spring-app\application-log4j.log.5 to C:\logs\spring-app\application-log4j.log.6
log4j: Renaming file C:\logs\spring-app\application-log4j.log.4 to C:\logs\spring-app\application-log4j.log.5
log4j: Renaming file C:\logs\spring-app\application-log4j.log.3 to C:\logs\spring-app\application-log4j.log.4
log4j: Renaming file C:\logs\spring-app\application-log4j.log.2 to C:\logs\spring-app\application-log4j.log.3
log4j: Renaming file C:\logs\spring-app\application-log4j.log.1 to C:\logs\spring-app\application-log4j.log.2
log4j: Renaming file C:\logs\spring-app\application-log4j.log to C:\logs\spring-app\application-log4j.log.1
log4j: setFile called: C:/STS/STS.3.2.0/logs/spring-app/application-log4j.log, true
log4j: setFile ended

这就是追加器失败的开始

log4j: rolling over count=10332832
log4j: maxBackupIndex=10
log4j: Renaming file C:\logs\spring-app\application-log4j.log.9 to C:\logs\spring-app\application-log4j.log.10
log4j: Renaming file C:\logs\spring-app\application-log4j.log.8 to C:\logs\spring-app\application-log4j.log.9
log4j: Renaming file C:\logs\spring-app\application-log4j.log.7 to C:\logs\spring-app\application-log4j.log.8
log4j: Renaming file C:\logs\spring-app\application-log4j.log.6 to C:\logs\spring-app\application-log4j.log.7
log4j: Renaming file C:\logs\spring-app\application-log4j.log.5 to C:\logs\spring-app\application-log4j.log.6
log4j: Renaming file C:\logs\spring-app\application-log4j.log.4 to C:\logs\spring-app\application-log4j.log.5
log4j: Renaming file C:\logs\spring-app\application-log4j.log.3 to C:\logs\spring-app\application-log4j.log.4
log4j: Renaming file C:\logs\spring-app\application-log4j.log.2 to C:\logs\spring-app\application-log4j.log.3
#Apparently fail the rename log.1 -> log.2
log4j: Renaming file C:\logs\spring-app\application-log4j.log to C:\logs\spring-app\application-log4j.log.1
log4j: setFile called: C:/STS/STS.3.2.0/logs/spring-app/application-log4j.log, true
log4j: setFile ended

这个问题使得较旧的日志(log.3 ~ log.9)逐渐通过重命名而消失，只留下第一个日志——application-log4j.log。因此这个文件可以疯狂增长到 1 GB+，并且不会生成其他日志。

但现在我真的没有太多方法可以深入找出到底发生了什么导致了这个问题(第二个日志文件无法重命名，似乎是放在文件上的日志)

Answer 1

log4j 1.2.17 中的 org.apache.log4j.RollingFileAppender 存在已知问题。例如，this bug in log4j 的描述看起来与您的问题相似。

您应该使用rolling file appender在 Apache Extras™ for Apache log4j™ 中，因为它是 recommended in the Javadoc to do so 。这是 link on Maven Central to the library .

您是否尝试过以下配置以查看是否可以解决您的问题？

log4j.appender.ROL=org.apache.log4j.rolling.RollingFileAppender
log4j.appender.ROL.Encoding=UTF-8
log4j.appender.ROL.File=C:/logs/spring-app/application-log4j.log
log4j.appender.ROL.layout = org.apache.log4j.PatternLayout
log4j.appender.ROL.layout.ConversionPattern=%d -- %p -- %c -- %m%n
log4j.appender.ROL.TriggeringPolicy=org.apache.log4j.rolling.SizeBasedTriggeringPolicy
log4j.appender.ROL.TriggeringPolicy.MaxFileSize=10000KB 
log4j.appender.ROL.RollingPolicy=org.apache.log4j.rolling.FixedWindowRollingPolicy
log4j.appender.ROL.RollingPolicy.ActiveFileName=C:/logs/spring-app/application-log4j.log
log4j.appender.ROL.RollingPolicy.FileNamePattern=C:/logs/spring-app/application-log4j.log.%i
log4j.appender.ROL.RollingPolicy.MaxIndex=10

最后，log4j 是一个旧库，并未得到积极开发。如果可行的话，您应该强烈考虑升级到 log4j 2.0。