When a broker goes down, we have an optimization in the controller that proactively shrinks ISR. The ISR shrink rate only measures the rate that the leader shrinks ISR and doesn't reflect the shrinking by the controller. In general, having ISR shrink rate stay at 0 is a good thing since it means that the followers can always keep up.
Thanks, Jun On Tue, Oct 22, 2013 at 12:55 AM, Monika Garg <gargmon...@gmail.com> wrote: > Thanks a lot Jun. > > Now im getting the values in ISR expansion rate,whenever broker goes down > and then up. > > But still ISR shrink rate is always having value 0. > > what I have done is: > > I made 3 node cluster.Than created 5 partitions with replica=3. > partitions got distributed on 1,2,3 brokers with isr= 1,2,3, and replica = > 1,2,3 > broker -3 is leader for 2 partitions. > > then i stopped one broker(say 3),then isr = 1,2 and replica = 1,2,3. > In this case I waited for some time to get the ISR shrink value to get > updated in my jconsole,but value remained 0 for all attributes of ISR > shrink rate. > > Then I started broker(say 3) that i stopped earlier,what I saw is: > > ISR expansion rate has the values as: > > count -2 (on both other brokers 1,2) > oneminuterate - 0.012 etc. > > then I again stopped broker-1,still isr shrink rate not getting any > value.Can you please check? > > One more thing if you can please have a look: > How the other attributes like FifteenMinuteRate,OneMinuteRate etc are > continuosly changing for any Mbean. > > > > > > > > On Tue, Oct 22, 2013 at 9:00 AM, Jun Rao <jun...@gmail.com> wrote: > > > Updated the description in > > http://kafka.apache.org/documentation.html#monitoring. Does that help > make > > things clearer? > > > > Thanks, > > > > Jun > > > > > > On Mon, Oct 21, 2013 at 9:43 AM, Monika Garg <gargmon...@gmail.com> > wrote: > > > > > Thanks for replying Neha.It helped me a lot in getting the things more > > > clear. > > > I just have some doubts for the value of below Mbeans,please have a > look: > > > (1)ISR expansion > > > rate::"kafka.server":name="ISRShrinksPerSec",type="ReplicaManager" > > > ,non-zero only during broker startup. > > > Does the property (1) mean that,it will be become zero when any broker > > (in > > > a 2 node cluster)is started,and will be non-zero again if both the > > brokers > > > are stopped. > > > (2)ISR shrink > > > rate::"kafka.server":name="ISRShrinksPerSec",type="ReplicaManager" > > > , 0 > > > Will this property(2) be always be zero? > > > Thanks. > > > > > > > > > > > > > > > > > > On Mon, Oct 21, 2013 at 8:35 PM, Neha Narkhede < > neha.narkh...@gmail.com > > > >wrote: > > > > > > > You may find this useful - > > > > http://kafka.apache.org/documentation.html#monitoring > > > > > > > > Let us know how we can improve the documentation further. > > > > > > > > Thanks, > > > > Neha > > > > > > > > > > > > On Mon, Oct 21, 2013 at 5:42 AM, Monika Garg <gargmon...@gmail.com> > > > wrote: > > > > > > > > > Hi, > > > > > > > > > > I am getting so many Mbeans from My JMX like > > kafka.server,kafka.network > > > > > etc. > > > > > > > > > > There are of different types and have a lot of attributes. > > > > > > > > > > I am trying to get when the attribute value for any Mbean is > getting > > > > > changed. > > > > > > > > > > But no helpful docs I am getting for it on google. > > > > > > > > > > Even the terms used like > > > > > > kafka.server":type="FetchRequestPurgatory",name="PurgatorySize",here > > > > > how/when the value of PurgatorySize get change.No clue for this. > > > > > Similar to this there are a lot more values like > > > > > > > > > > when a topic is created,there is 554 values in kafka.network Mbean. > > > > > > > > > > Please any one can share any doc that explains the Mbeans for > > > Kafka-0.8. > > > > > > > > > > It will be really helpful for me. > > > > > Thanks. > > > > > > > > > > -- > > > > > *Moni* > > > > > > > > > > > > > > > > > > > > > -- > > > *Moniii* > > > > > > > > > -- > *Moniii* >
