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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1349) Garbage-free ThreadContext map
Date Sat, 10 Sep 2016 19:57:20 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15480351#comment-15480351

Ralph Goers commented on LOG4J2-1349:

Nothing is setting of warning bells. My major concern here is about any impact on performance.
You seem to have tested this pretty thoroughly though so I'm OK with it.

> 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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