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https://issues.apache.org/jira/browse/LOG4J2-1339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma closed LOG4J2-1339.
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> AsyncLogger should not call instanceof TimestampMessage in hot path
> -------------------------------------------------------------------
>
> Key: LOG4J2-1339
> URL: https://issues.apache.org/jira/browse/LOG4J2-1339
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.0.1, 2.0.2, 2.1, 2.2, 2.3, 2.4, 2.4.1, 2.5
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.6
>
>
> With LOG4J2-744, AsyncLogger attempts to get the time from the message by
> calling
> {code}
> millis = message instanceof TimestampMessage ? ((TimestampMessage)
> message).getTimestamp() : CLOCK.currentTimeMillis()
> {code}
> for every message. The vast majority of messages are not TimestampMessages so
> the time is eventually obtained from the clock. However, benchmarking shows
> that the {{instanceof}} check is not free.
> It gives better performance to postpone the above logic to the background
> thread.
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