Martin Wegner created LOGBACK-1348: -------------------------------------- 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} -- This message was sent by Atlassian JIRA (v7.3.1#73012)