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https://issues.apache.org/jira/browse/LOG4J2-1341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma updated LOG4J2-1341:
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Fix Version/s: (was: 2.8)
2.8.1
> (GC) Avoid allocating temporary objects in Pattern Converters for
> PatternLayout
> -------------------------------------------------------------------------------
>
> Key: LOG4J2-1341
> URL: https://issues.apache.org/jira/browse/LOG4J2-1341
> Project: Log4j 2
> Issue Type: Improvement
> Components: Pattern Converters
> Affects Versions: 2.5
> Reporter: Remko Popma
> Fix For: 2.8.1
>
>
> *To do*
> The following pattern converters can be modified to avoid creating temporary
> objects in their {{format}} method:
> * -all done-
> *Investigate*
> The following pattern converters may be difficult to modify since they rely
> on JDK components that create temporary objects:
> * (-) ExtendedThrowablePatternConverter
> * (-) RegexReplacementConverter
> * (-) RootThrowablePatternConverter
> * (-) ThrowablePatternConverter
> * (-) UuidPatternConverter
> * (-) ClassNamePatternConverter (location information requires creating
> StackTraceElements)
> * (-) FileLocationPatternConverter
> * (-) FullLocationPatternConverter
> * (-) LineLocationPatternConverter
> * (-) MethodLocationPatternConverter
> *Done*
> The following pattern converters already do not allocate temporary objects in
> their format method:
> * (/) AbstractStyleNameConverter (since 2.8)
> * (/) HighlightConverter (since 2.7, thanks to Richard Zschech)
> * (/) StyleConverter (since 2.7, thanks to Richard Zschech)
> * (/) DatePatternConverter
> * (/) EqualsIgnoreCaseReplacementConverter (since 2.8)
> * (/) EqualsReplacementConverter (since 2.8)
> * (/) EncodingPatternConverter (since 2.8)
> * (/) IntegerPatternConverter (since 2.8)
> * (/) LevelPatternConverter
> * (/) LineSeparatorPatternConverter
> * (/) LiteralPatternConverter (unless literal contains '${')
> * (/) LoggerPatternConverter
> * (/) MapPatternConverter (since 2.8 - note that constructing a MapMessage is
> not garbage-free)
> * (/) MarkerPatternConverter (since 2.8)
> * (/) MarkerSimpleNamePatternConverter
> * (/) MaxLengthConverter (since 2.8)
> * (/) MdcPatternConverter (since 2.7)
> * (/) MessagePatternConverter (unless a Jansi or HTML renderer is configured
> or message has '${' lookups)
> * (/) NamePatternConverter
> * (/) NanoTimePatternConverter
> * (/) NdcPatternConverter (since 2.8 ContextStack implementations implement
> the StringBuilderFormattable interface - note that the ThreadContext stack is
> cloned for each log event and is not garbage-free)
> * (/) RelativeTimePatternConverter (since 2.8)
> * (/) SequenceNumberPatternConverter (since 2.8)
> * (/) ThreadIdPatternConverter
> * (/) ThreadNamePatternConverter
> * (/) ThreadPriorityPatternConverter
> * (/) VariablesNotEmptyReplacementConverter (since 2.8)
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