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https://issues.apache.org/jira/browse/LOG4J2-1349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15441002#comment-15441002
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Remko Popma commented on LOG4J2-1349:
-------------------------------------
I moved OpenHashContextData and related classes to the log4j-perf module among
some other cleanup.
> Garbage-free ThreadContext map
> ------------------------------
>
> Key: LOG4J2-1349
> URL: https://issues.apache.org/jira/browse/LOG4J2-1349
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Affects Versions: 2.5
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.7
>
> Attachments: DataStructOpsPerfMediumDataSet.png,
> DataStructOpsPerfSmallDataSet.png, InjectWithConfigProperties.png,
> InjectWithoutConfigProperties.png, ThreadContextPut.png,
> v2_DataStructOpsPerfMediumDataSet.png, v2_DataStructOpsPerfSmallDataSet.png,
> v2_InjectWithConfigProperties.png, v2_InjectWithoutConfigProperties.png,
> v2_ThreadContextGet.png, v2_ThreadContextPut.png
>
>
> The current ThreadContext map and stack implementations allocate temporary
> objects. This ticket is to investigate and track the work for alternative
> implementations that are garbage-free.
> Both DefaultThreadContextMap and DefaultThreadContextStack are copy-on-write
> data structures: each modification replaces the ThreadLocal object with a
> modified copy. The advantage of this approach is that there is no need to
> make a copy for each LogEvent.
> Also, DefaultThreadContextMap uses a JDK map, the JDK collections tend to
> allocate a lot of temporary objects.
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