I was watching this recently, it's very interesting: http://www.java-tv.com/2009/09/24/slf4j-and-logback-projects/slf4j has some very nice properties, not the least that it solves some problems like simplifying integration of apps that use different logging systems.
I had noticed that Avro uses slf4j, and that Hadoop in general has it as part of the ivy config (although the code is still log4j based). Is the intent to move all of Hadoop to slf4j over time?
Patrick
