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 >
