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https://issues.apache.org/jira/browse/CASSANDRA-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12842987#action_12842987
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gabriele renzi commented on CASSANDRA-625:
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No performance benefits (though it would allow switching to logback which is
faster than log4j, I'm told)
To me it's because of:
* messageformatter-like statements are cleaner, and more robust than string
concatenation
* the ability to get rid of the "if logger.isFooEnabled" trick cause there is
no need to avoid the infamous "expensive string concatenation" that happens
only inside the logging method, where it is already guarded.
* implicit management of null values avoids possible NPEs (see CASSANDRA-631)
But mostly, when I started this patch there were no direct references to
log4j-specific classes in the code, so cassandra deployments could use any of
the underlying slf4j adapters for ease of integration with existing code
without going into multiple loggers madness. We, for example, prefer logback (
http://logback.qos.ch/ ).
I understand this is not really compelling though, but I was suggested to
provide a patch and so I did it, I won't take it badly if it's not merged :)
> Migrate to slf4j from log4j in cassandra code
> ---------------------------------------------
>
> Key: CASSANDRA-625
> URL: https://issues.apache.org/jira/browse/CASSANDRA-625
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Environment: all
> Reporter: gabriele renzi
> Priority: Minor
> Fix For: 0.7
>
> Attachments: CASSANDRA-625.patch
>
>
> currently code generated from thrift uses slf4j while cassandra uses raw
> log4j.
> There are various level in which this can be changed:
> * simply switch log4j loggers with slf4j logger (done in patch)
> * replacing log4j-isms (e.g. string concatenation+isFooEnabled in all code
> paths) with slf4j-isms (marker string + additional arguments)
> * remove code that is already available for lsf4j (LogUtils.java, I believe
> is unnecessary)
> I am posting this as a reminder, I have a half baked patch locally but it
> needs more work
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