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https://issues.apache.org/jira/browse/LOG4J2-1595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma resolved LOG4J2-1595.
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Resolution: Incomplete
Several filters are now garbage-free. With the remaining filters this is
non-trivial to accomplish.
It may be possible to make BurstFilter allocate less, but I'm closing this
ticket for now.
> (GC) Avoid allocating temporary objects in Filter implementations
> -----------------------------------------------------------------
>
> Key: LOG4J2-1595
> URL: https://issues.apache.org/jira/browse/LOG4J2-1595
> Project: Log4j 2
> Issue Type: New Feature
> Components: Filters
> Affects Versions: 2.6.2
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.8
>
>
> Review current Filter implementation classes and change them to be
> garbage-free where feasible. Document on the web site which filters are
> garbage free and which are not.
> h4. Current status
> * (-) BurstFilter (allocates, non-trivial to change)
> * (/) CompositeFilter (adding & removing elements produces garbage for thread
> safety, no allocation in steady state) - since 2.6
> * (/) DynamicThresholdFilter (garbage free since 2.6)
> * (/) LevelRangeFilter (garbage free since 2.8)
> * (/) MapFilter (garbage free since 2.8, but logging a MapMessage still
> allocates)
> * (/) MarkerFilter (garbage free since 2.8)
> * (-) RegexFilter (not garbagefree due to JDK regex library)
> * (-) ScriptFilter (not garbagefree: creates new Binding object for each
> event)
> * (/) StructuredDataFilter (garbage free since 2.8)
> * (/) ThreadContextMapFilter (garbage free since 2.8)
> * (/) ThresholdFilter (garbage free since 2.8)
> * (/) TimeFilter (uses Calendar to calculate millisSinceMidnight for each
> event. Can refactor by reusing some of the FixedDateFormat logic.)
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