Hi Jun, These are the two lines of log4j-related warnings I get when I try to run my producer:
log4j:WARN No appenders could be found for logger (kafka.utils.VerifiableProperties). log4j:WARN Please initialize the log4j system properly. I have searched extensively online and have so far not found how to "initialize the log4j system" properly. All I want is to create debug logging so I can better find why my producer fails to send messages to the broker cluster. Alex On Thu, Nov 6, 2014 at 3:31 PM, Jun Rao <jun...@gmail.com> wrote: > The log4j entries before that error should tell you the cause of the error. > > Thanks, > > Jun > > On Tue, Nov 4, 2014 at 11:25 PM, Alex Melville <amelvi...@g.hmc.edu> > wrote: > > > Background: > > > > I have searched for a while online, and through the files located in the > > kafka/logs directory, trying to find where kafka writes log output to in > > order to debug the SimpleProducer I wrote. My producer is almost > identical > > to the simple producer located here > > > > https://cwiki.apache.org/confluence/display/KAFKA/0.8.0+Producer+Example > > > > except for I'm using Protobuffers instead of Strings to publish data to a > > cluster. I'm receiving the following error when I try to run the > > SimpleProducer > > > > Exception in thread "main" kafka.common.FailedToSendMessageException: > > Failed to send messages after 3 tries. > > > > at > > > > > kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:90) > > > > at kafka.producer.Producer.send(Producer.scala:76) > > > > at kafka.javaapi.producer.Producer.send(Producer.scala:33) > > > > at stream.SimpleProducer.send(Unknown Source) > > > > at stream.SimpleProducer.main(Unknown Source) > > > > > > I know this isn't a network problem, because I ran the console-producer > and > > successfully published data to the same broker that my Simple Producer is > > trying to publish to. I now want to try to debug this error. > > > > > > > > Question: > > > > Where would my Simple Producer write info about its startup and eventual > > error, such that I can read it and try to reason as to why it failed? If > it > > produces no log data on its own, what is the best way to write this data > to > > a somewhere where I can use it to debug? I've noticed that log4j, which I > > understand is a often-used library for logging in Java, came with my > kafka > > download. Am I supposed to use log4j for this info? I do not know very > much > > about log4j, so any info on how to get this setup would also be > > appreciated. > > > > > > -Alex > > >
