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* >
