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https://issues.apache.org/jira/browse/CASSANDRA-625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12843147#action_12843147
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Eric Evans commented on CASSANDRA-625:
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> 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/ ). 

No expert here, but it was my understanding that this was the general reasoning 
for behind slf4j.

> 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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