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https://issues.apache.org/jira/browse/LOG4J2-435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036192#comment-15036192
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Robert Schaft commented on LOG4J2-435:
--------------------------------------
{code:xml}
<Appenders>
<RollingFile name="RollingFile" fileName="logs/app.log"
filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
<PatternLayout>
<Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy />
<SizeBasedTriggeringPolicy size="250 MB"/>
</Policies>
</RollingFile>
</Appenders>
{code}
If we had the discussion about those trigger, we would probably end up naming
that just slightly different (no function added or removed) and it would be
clearer how they are combined:
{code:xml}
<Appenders>
<FileAppender name="RollingFile" fileName="logs/app.log">
<PatternLayout>
<Pattern>%d %p %c{1.} [%t] %m%n</Pattern>
</PatternLayout>
<Rollover
filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
<Or>
<TimeBasedFileNameChange />
<FileSize exceeds="250 MB"/>
</Or>
</Rollover>
</RollingFile>
</Appenders>
{code}
An examples for filter is harder, because they are not well documented and the
logic is strange. Let's look at the following example:
{code:xml}
<Filters>
<Marker marker="EVENT" onMatch="ACCEPT" onMismatch="NEUTRAL"/>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR"
onMatch="ACCEPT" onMismatch="NEUTRAL">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</Filters>
{code}
This could be also
{code:xml}
<Filter>
<Or> <!-- onMatch = ACCEPT, onMismatch=NEUTRAL -->
<Marker marker="EVENT"/>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</Or>
</Filters>
{code}
while
{code:xml}
<Filters>
<Marker marker="EVENT" onMatch="ACCEPT" onMismatch="DENY"/>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR"
onMatch="ACCEPT" onMismatch="DENY">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</Filters>
{code}
would be
{code:xml}
<Filter>
<And> <!-- onMatch = ACCEPT, onMismatch=DENY -->
<Marker marker="EVENT"/>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</And>
</Filters>
{code}
and what about onMatch=DENY?
{code:xml}
<Filters>
<Marker marker="EVENT" onMatch="DENY" onMismatch="NEUTRAL"/>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR"
onMatch="DENY" onMismatch="NEUTRAL">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</Filters>
{code}
would be
{code:xml}
<Filter>
<And> <!-- onMatch = DENY, onMismatch=NEUTRAL -->
<Not><Marker marker="EVENT"/></Not>
<Not>
<DynamicThresholdFilter key="loginId" defaultThreshold="ERROR">
<KeyValuePair key="User1" value="DEBUG"/>
</DynamicThresholdFilter>
</Not>
</And>
</Filters>
{code}
It is highly probably that I made some mistakes in these quickly made up filter
examples, because the combined filter is so confusing and undocumented. But I
think it is nevertheless enough to show, that we have more boolean logic in
log4j than you probably assumed.
> Feature request: auto-delete older log files
> ---------------------------------------------
>
> Key: LOG4J2-435
> URL: https://issues.apache.org/jira/browse/LOG4J2-435
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Arkin Yetis
> Assignee: Remko Popma
> Labels: Rollover
> Fix For: 2.5
>
> Attachments: LimitingRolloverStrategy.java, SizeParser.java
>
>
> Original description:
> {quote}
> DefaultRolloverStrategy max attribute only applies if you have a %i in the
> file pattern. This request is to enhance DefaultRolloverStrategy or another
> appropriate component to allow a max number of files limit to apply across
> days/months/years when a filePattern includes a date pattern.
> {quote}
> ----
> One of the most requested features is to add the ability to Log4j to "clean
> up" older log files. This usually means deleting these files, although it
> could also mean moving them to a different location, or some combination of
> these.
> Users have different requirements for selecting the files to clean up. A
> common request is the ability to keep the last X number of log files. This
> works well if rollover is only date based but may give undesired results with
> size based rollover.
> Another factor to consider is that the directory containing the log files may
> contain the log files for multiple appenders, or even files unrelated to
> logging.
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