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https://issues.apache.org/jira/browse/LOG4J2-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570030#comment-13570030
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Remko Popma commented on LOG4J2-153:
------------------------------------
I see. Looks like following this route will get complex very fast...
Maybe I am over-engineering things, and something much simpler could accomplish
the same goal.
How about these ideas:
1. exclude location information for async Loggers/Appenders. Reasoning: clients
choose async Loggers/Appenders to decrease logging latency. Since speed is
their main concern, they won't need/want the expensive location. Clients who do
want location can use the standard (synchronous) Logger/Appenders.
or
2. exclude by default (as in #1), but have a system property that enables
clients to force location information to be included in async Loggers/Appenders.
3. any other ideas, anyone?
> Async Logger/Appender performance improvement: provide mechanism to discover
> if location StackTraceElement is actually required downstream.
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-153
> URL: https://issues.apache.org/jira/browse/LOG4J2-153
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Remko Popma
>
> (update 2013 Feb 4: changed summary.
> Previous title: Add a method to the Layout interface to allow Loggers to
> discover if any of their Appenders need the location StackTraceElement.)
> ----
> Use Case: any asynchronous Logger or Appender has this problem:
> should it take a snapshot of the call stack (as implemented in
> Log4jLogEvent.getSource) or not?
> This is an expensive method (1600+ nanoseconds on a machine with 2.9GHz
> cores) so you only want to call it if you need it. Currently there is no way
> to discover if the location information is used by any of the configured
> layouts.
> If the Layout interface has a method that indicates whether the layout calls
> the LogEvent.getSource method, then the Logger can query its LoggerConfig if
> any of the configured Appenders has a Layout which needs location info.
> (Maybe boolean needsLocationInfo() would be a good name?)
> With this information, a Logger can construct Log4jLogEvents with a non-null
> dummy StackTraceElement location if none of the layouts downstream need
> location info. The non-null dummy location would prevent LogEvent.getSource
> from taking a call stack snapshot.
> The current AsynchAppender class would get an immediate performance boost
> from this, and custom asynchronous Loggers or Appenders would reap the same
> benefits.
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