[logback-dev] [JIRA] (LOGBACK-1348) SizeAndTimeBasedRollingPolicy on Windows sometimes exceeds maxFileSize and file counter explodes

[QOS.CH (JIRA)]

Martin Wegner created LOGBACK-1348:
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             Summary: SizeAndTimeBasedRollingPolicy on Windows sometimes exceeds maxFileSize and file counter explodes
                 Key: LOGBACK-1348
                 URL: https://jira.qos.ch/browse/LOGBACK-1348
             Project: logback
          Issue Type: Bug
          Components: logback-core
    Affects Versions: 1.2.3
         Environment: Windows Server 2012 R2
            Reporter: Martin Wegner
            Assignee: Logback dev list


I have at least two cases where the maxFileSize (5MB) was exceeded and the file counter exploded.

xxx.2017-10-11.5.json with 5MB
{color:red}xxx.2017-10-11.12186.json 32.4MB{color}
xxx.2017-10-11.12187.json 1.33MB

xxx.2017-10-19.8.json with 5MB
{color:red}xxx.2017-10-19.1626.json with 8.98MB{color}
xxx.2017-10-19.1627.json with 2.82MB

My guess is, that the log file had a size of 4.99MB and then several threads simultaneously wrote into the same log file and therefore parallel rollovers occurred?

{code:xml}
<appender name="JSON_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
  <file>${fileNamePrefix}.json</file>
  <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
    <!-- daily rollover -->
    <fileNamePattern>${fileNamePrefix}.%d{yyyy-MM-dd}.%i.json</fileNamePattern>
    <!-- keep 30 days' worth of history -->
    <maxHistory>30</maxHistory>
    <!-- each file should be at most 5MB -->
    <maxFileSize>5MB</maxFileSize>
  </rollingPolicy>
  <!-- encoders are assigned the type
       ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
  <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
    <providers>
      <timestamp>
        <fieldName>timestamp</fieldName>
      </timestamp>
      <logLevel>
        <fieldName>logLevel</fieldName>
      </logLevel>
      <threadName>
        <fieldName>threadName</fieldName>
      </threadName>
      <loggerName>
        <fieldName>loggerName</fieldName>
      </loggerName>
      <callerData>
        <classFieldName>className</classFieldName>
        <methodFieldName >methodName</methodFieldName>
        <fileFieldName>[ignore]</fileFieldName>
        <lineFieldName>lineNumber</lineFieldName>
      </callerData>
      <message />
      <stackTrace>
        <fieldName>stackTrace</fieldName>
        <throwableConverter class="net.logstash.logback.stacktrace.ShortenedThrowableConverter">
          <maxDepthPerThrowable>30</maxDepthPerThrowable>
          <rootCauseFirst>true</rootCauseFirst>
        </throwableConverter>
      </stackTrace>
    </providers>
  </encoder>
</appender>
{code}




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