That error comes if you are trying to create a message/stream on a consumer instantiated object more than once.
Why are you using tomcat for the consumers? Is it to see the results of messages? if so you need to isolate the Consumer in some way so there is a singleton (assuming one partition or if more than one partition some type of consumer pool) and the messages being consumed write to a thread safe memory structure and then the UI can read from that thread safe memory structure. /******************************************* Joe Stein Founder, Principal Consultant Big Data Open Source Security LLC http://www.stealth.ly Twitter: @allthingshadoop <http://www.twitter.com/allthingshadoop> ********************************************/ On Fri, Dec 13, 2013 at 5:42 PM, Seshadri, Balaji <balaji.sesha...@dish.com>wrote: > 0.8 > > -----Original Message----- > From: Neha Narkhede [mailto:neha.narkh...@gmail.com] > Sent: Friday, December 13, 2013 3:33 PM > To: users@kafka.apache.org > Subject: Re: Unable to start consumers in Tomcat > > Which version of kafka are you using? > > > On Fri, Dec 13, 2013 at 2:29 PM, Seshadri, Balaji > <balaji.sesha...@dish.com>wrote: > > > Any idea on this error guys ?. > > > > -----Original Message----- > > From: Seshadri, Balaji [mailto:balaji.sesha...@dish.com] > > Sent: Friday, December 13, 2013 9:32 AM > > To: 'users@kafka.apache.org' > > Subject: Unable to start consumers in Tomcat > > > > Hi , > > > > Can you guys lets us know why are we getting this error when try to > > spawn a consumer ?. > > > > ZookeeperConsumerConnector can create message streams at most once > > > > Balaji > > >
