Ohh...that is the case.I never think that way that in a running cluster there can be no active controller.Yes you are right,it will be a bug then. On Nov 19, 2013 6:02 PM, "Neha Narkhede" <neha.narkh...@gmail.com> wrote:
> Sure, but this is to alert if there is no active controller when all > brokers are live, which points to a bug. > > -Neha > > > On Tue, Nov 19, 2013 at 9:53 AM, Monika Garg <gargmon...@gmail.com> wrote: > > > Thanks Neha,Now got your point completely. > > > > One more small thing that I want to understand: > > > > The case when mbean values for ActiveControllerCount > > across all brokers in a cluster != 1,will be only if all the brokers of > the > > cluster are down and in that case it will not be possible to get the > value > > of this Mbean from jconsole,as the jconsole will be disconnected if the > > Kafka service is down on the given jmxPort. > > So it will never be possible to get the value of the mentioned Mbean if > all > > the brokers are down,so it will never be the case that you are > > mentioning.Please correct me if I am misunderstanding. > > > > > > On Tue, Nov 19, 2013 at 7:48 PM, Neha Narkhede <neha.narkh...@gmail.com > > >wrote: > > > > > Like I mentioned above, it is due to ease of alerting - > > > > > > " alert if the addition of the mbean values for ActiveControllerCount > > > across all brokers in a cluster != 1." > > > > > > It can be done with boolean as well, we found the addition rule to be > > > easier. > > > > > > Thanks, > > > Neha > > > On Nov 19, 2013 1:48 AM, "Monika Garg" <gargmon...@gmail.com> wrote: > > > > > > > Thanks for replying Neha. > > > > Yes I got the same thing as u written:There should only be one > > controller > > > > at any point of time in a Kafka > > > > cluster. If that controller broker is bounced, then the controller > > moves > > > to > > > > another broker. > > > > But my doubt is this value will fluctuate always between 0 and 1 ,so > it > > > > must be a boolean value and its name shouldn't be > > ActiveControllerCount. > > > > > > > > > > > > On Tue, Nov 19, 2013 at 1:15 PM, Neha Narkhede < > > neha.narkh...@gmail.com > > > > >wrote: > > > > > > > > > There should only be one controller at any point of time in a Kafka > > > > > cluster. If that controller broker is bounced, then the controller > > > moves > > > > to > > > > > another broker. In general, you want to alert if the addition of > the > > > > mbean > > > > > values for ActiveControllerCount across all brokers in a cluster != > > 1. > > > > > > > > > > Thanks, > > > > > Neha > > > > > > > > > > > > > > > On Mon, Nov 18, 2013 at 11:16 PM, Monika Garg < > gargmon...@gmail.com> > > > > > wrote: > > > > > > > > > > > Hi, > > > > > > > > > > > > there is one Mbean in jconsole with name > > > > > > > > > "kafka.controller":type="KafkaController",name="ActiveControllerCount", > > > > > > > > > > > > the Value of this Mbean is always 1 on one broker and 0 on all > > others > > > > > > remaining broker of the 3 nodes kafka cluster.Will it always be > > like > > > > > this? > > > > > > > > > > > > As per my understanding it will always be 1 on one and only one > > > broker > > > > as > > > > > > there will be only one active controller in the cluster at any > > point > > > of > > > > > > time. > > > > > > > > > > > > So it should be "kafka.controller":type="KafkaController",name=" > > > > > > *ActiveController*" and it sholud be a boolean value. > > > > > > > > > > > > Please correct if I am wrong. > > > > > > > > > > > > -- > > > > > > *Moniii* > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > *Moniii* > > > > > > > > > > > > > > > -- > > *Moniii* > > >
