Improvement for Log4j configuration
Review Request #6316 - Created Aug. 2, 2012 and updated
Updated log4j.properties 1. Add 'logs' folder. It's better to aggregate logs into unified folder. 2. Log file using DailyRollingFileAppender 3. More useful log pattern. Add thread and code line information 4. Set debug level for Hadoop. If we use debug level, Hadoop log takes too many lines.
That's OK in my environment