Hi Aleksey, do you get a chance to take a look? Thanks Dikang.
On Thu, Mar 24, 2016 at 10:30 PM, Dikang Gu <dikan...@gmail.com> wrote: > @Aleksey, sure, here is the jira: > https://issues.apache.org/jira/browse/CASSANDRA-11432 > > Thanks! > > On Thu, Mar 24, 2016 at 5:32 PM, Aleksey Yeschenko <alek...@apache.org> > wrote: > >> Best open a JIRA ticket and I’ll have a look at what could be the reason. >> >> -- >> AY >> >> On 24 March 2016 at 23:20:55, Dikang Gu (dikan...@gmail.com) wrote: >> >> @Aleksey, we are writing to cluster with CL = 2, and reading with CL = 1. >> And overall we have 6 copies across 3 different regions. Do you have >> comments about our setup? >> >> During the repair, the counter value become inaccurate, we are still >> playing with the repair, will keep you update with more experiments. But >> do >> you have any theory around that? >> >> Thanks a lot! >> Dikang. >> >> On Thu, Mar 24, 2016 at 11:02 AM, Aleksey Yeschenko <alek...@apache.org> >> wrote: >> >> > After repair is over, does the value settle? What CLs do you write to >> your >> > counters with? What CLs are you reading with? >> > >> > -- >> > AY >> > >> > On 24 March 2016 at 06:17:27, Dikang Gu (dikan...@gmail.com) wrote: >> > >> > Hello there, >> > >> > We are experimenting Counters in Cassandra 2.2.5. Our setup is that we >> > have >> > 6 nodes, across three different regions, and in each region, the >> > replication factor is 2. Basically, each nodes holds a full copy of the >> > data. >> > >> > When are doing 30k/s counter increment/decrement per node, and at the >> > meanwhile, we are double writing to our mysql tier, so that we can >> measure >> > the accuracy of C* counter, compared to mysql. >> > >> > The experiment result was great at the beginning, the counter value in >> C* >> > and mysql are very close. The difference is less than 0.1%. >> > >> > But when we start to run the repair on one node, the counter value in >> C* >> > become much less than the value in mysql, the difference becomes larger >> > than 1%. >> > >> > My question is that is it a known problem that the counter value will >> > become under-counted if repair is running? Should we avoid running >> repair >> > for counter tables? >> > >> > Thanks. >> > >> > -- >> > Dikang >> > >> > >> >> >> -- >> Dikang >> >> > > > -- > Dikang > > -- Dikang
