You might want to look at log-rotation as well, if the issue is more about size than stuff you don't need in the log.
To add to what Nic said - https://confluence.atlassian.com/display/JIRAKB/How+to+Rotate+Catalina+Log+File
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You mean the access logs? You can turn that off.
https://confluence.atlassian.com/display/JIRA/User+access+logging
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