Hi Joe, Thanks for your answer, seems I know what's its purpose.
Thanks a lot. Jerry -----Original Message----- From: Joe Stein [mailto:joe.st...@stealth.ly] Sent: Thursday, July 17, 2014 10:15 AM To: d...@kafka.apache.org Cc: users@kafka.apache.org Subject: Re: Question about ConsoleConsumer auto.offset.reset is only when there is not an already established offset to consume from or an offset that no longer exists (and is invalid) in the case of truncated logs or compaction). You can force this behavior by deleting the znode /******************************************* Joe Stein Founder, Principal Consultant Big Data Open Source Security LLC http://www.stealth.ly Twitter: @allthingshadoop <http://www.twitter.com/allthingshadoop> ********************************************/ On Wed, Jul 16, 2014 at 10:08 PM, Shao, Saisai <saisai.s...@intel.com> wrote: > Hi folks, > > A newbie question when investigating ConsoleConsumer's code, > > When we use ConsoleConsumer by setting "-from-beginning", we will set > property as "auto.offset.reset"="smallest", which means moving the > offset to the beginning of the data. But in the code, we still need to > delete Zookeeper's group metadata as: > > if(options.has(resetBeginningOpt)) > ZkUtils.maybeDeletePath(options.valueOf(zkConnectOpt), "/consumers/" > + options.valueOf(groupIdOpt)) > > From my understanding, setting "auto.offset.rest"="smallest" is enough > to seek to the beginning of the data, why we still need to delete > Zookeeper metadata? Is there any specific reason or some under-the-cover > concerns? > > Sorry for the unthoughtful question and really appreciate your answer. > > Thanks > Jerry >
