[jira] [Commented] (LOG4J2-1349) Garbage-free ThreadContext map and stack

["Remko Popma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-1349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15222595#comment-15222595 ] 

Remko Popma commented on LOG4J2-1349:
-------------------------------------

Link this ticket to LOG4J2-1282: a garbage-free implementation should make it possible to merge configuration properties into the ThreadContext map without allocating temporary objects.

> Garbage-free ThreadContext map and stack
> ----------------------------------------
>
>                 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
>
> 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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