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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LOG4J2-1595) (GC) Avoid allocating temporary objects in Filter implementations
Date Sun, 13 Nov 2016 12:51:58 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-1595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Remko Popma resolved LOG4J2-1595.
---------------------------------
    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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