Hi Helin, You can monitor the under_replicated_partitions count. More specifically when you shutdown broker A, URP would increase to non-zero values, and when you restart A its value will gradually decrease to 0, only bounce broker B when URP drops to 0.
Guozhang On Thu, May 21, 2015 at 6:12 AM, Helin Xiang <xkee...@gmail.com> wrote: > Hi, Guozhang > > Is there a way to monitor/check if a broker has catched up most of the > replicas of topics in sync? > > We are considering an upgrade to 0.8.2.1. A rolling upgrade plan seems > possible because we don't wan't to lose any data. It occured to me that > rolling upgrade wihout control can still lose data. > > suppose broker A and broker B both has partition 1. > > step 1. broker A did an upgrade. partition 1's leader became broker B, data > will come into broker B. > step 2. broker B did an upgrade too. If broker A has not catched all the > recent data from broker B, after broker A has become leader of partition 1, > the recent data will lose. > > the only way seems to wait enough time between step 2 and step 1. but we > don't know how much is enough. > > any better solutions for rolling upgrade? > > Thanks > > > On Fri, Oct 17, 2014 at 11:12 PM, Guozhang Wang <wangg...@gmail.com> > wrote: > > > Hi Balaji, > > > > You could do a rolling bounce of the brokers to do the in-place upgrade > if > > your partitions have at least two replicas. After that you may probably > > need to rebalance the leaders if they are not balanced any more. > > > > Guozhang > > > > On Wed, Oct 15, 2014 at 10:53 AM, Seshadri, Balaji < > > balaji.sesha...@dish.com > > > wrote: > > > > > Hi Guys, > > > > > > Can you guys share any experiences you had with Live Upgrade ?. > > > > > > How reliable is it ?.Did we lose messages ?. > > > > > > What issues did you guys face when doing live upgrade. > > > > > > We are planning to upgrade to 0.8.2 from 0.8-beta before we move our > web > > > methods broker based messaging layer to Kafka. > > > > > > We would like to get your inputs. > > > > > > Thanks, > > > > > > Balaji > > > > > > > > > > > -- > > -- Guozhang > > > > > > -- > > > *Best Regards向河林* > -- -- Guozhang
