My vote would be with log4j, I don't have that much experience with log4j2 or a good feel for how much the industry is moving towards it.
On Mon, Feb 3, 2014 at 11:17 AM, Joel Koshy <jjkosh...@gmail.com> wrote: > We are already using other libraries in various parts of our code > (e.g., metrics, zkclient, joptsimple, etc) some of which pull in these > other logging dependencies anyway. i.e., what do we gain by using jul? > There may be a good reason why people don't use jul so I think we > should fully understand that before going with jul. So it may be > simpler to just stick with log4j for the client rewrites and > investigate logging later. > > log4j2 is becoming more widespread and many users seem to be favorable > toward logback. slf4j would cover all of these very easily. From what > I understand jul does not make it very easy to plug in with these > various options but I could be wrong. > > I completely agree on the need to fix our client logging as that will > go a long way in usability for end-users unless we want to keep > getting asked the "Why do I see this ERROR in my logs..?" questions. > > Joel > > On Mon, Feb 03, 2014 at 11:08:39AM -0800, Neha Narkhede wrote: > > >> Basically my preference would be java.util.logging unless there is > some > > known problem with it, otherwise I guess slf4j, and if not that then > log4j. > > > > +1. My preference is to use java.util.logging to avoid adding an external > > dependency, > > but I'm not too sure about what's the "standard" out there, so open to > > suggestions > > on picking a different library. > > > > > > > > On Mon, Feb 3, 2014 at 11:00 AM, Jay Kreps <jay.kr...@gmail.com> wrote: > > > > > We probably need to add a small amount of logging in the new producer > and > > > (soon) consumer clients. I wanted to have a quick discussion on logging > > > libraries before I start adding this in the producer. > > > > > > Previously we have been pretty verbose loggers and I think we should > stop > > > that. For clients you mostly don't need to log: if there is an error > you > > > should throw it back not log it, so you don't need ERROR logging. > Likewise > > > I think it is rude to pollute peoples logs with the details of client > > > initialization (establishing connections, etc), so you don't need INFO > > > logging. However perhaps there is an argument to be made for WARN and > > > DEBUG. I think it is perhaps useful to log a WARN when a server breaks > a > > > connection or metadata initialization fails. It can sometimes also be > > > useful to be able to enable debug logging to see step by step > processing in > > > the client, which is the case for DEBUG logging. > > > > > > Here is my knowledge about the state of Java logging: > > > 1. Most people still use log4j. The server is using log4j. > > > 2. Second runner-up in slf4j. I personally consider slf4j pretty silly > but > > > this is perhaps the more flexible choice since people can plug in > different > > > stuff. > > > 3. java.util.logging ships with the jdk, but for some reason no one > uses > > > it. > > > 4. There is no critical mass around any other logging library. > > > > > > The context for how to think about this is the following. We are not > trying > > > to pick the "best" logging library. Fundamentally logging is pretty > > > straight-forward and for our simple use case it is inconceivable that > any > > > particular library could be much better than any other in terms of > feature > > > set. We want the most standard library. My goal is to minimize the > > > dependencies of the client and make our basic logging cases work for > most > > > cases. > > > > > > Is there a reason not to just the java.util.logging? It comes with the > jdk > > > and supports pluggable appenders so people who have some other library > can > > > plug that in right? > > > > > > Basically my preference would be java.util.logging unless there is some > > > known problem with it, otherwise I guess slf4j, and if not that then > log4j. > > > > > > Thougts? > > > > > > -Jay > > > > >
