Another question, We use 9142 cqlsh port in one of the datacenter and on other datacenter we use 9042 port. How should we configure this ?
On 24 May 2018 at 10:22, Surbhi Gupta <surbhi.gupt...@gmail.com> wrote: > What is the impact of > PARALLEL - all replicas at the same time ? > Will it make repair faster,? > Do we expect more CPU , Load and memory usage in case if we use Parallel , > compare to other settings ? > > > > On 21 May 2018 at 22:55, Alexander Dejanovski <a...@thelastpickle.com> > wrote: > >> You won't be able to have less segments than vnodes, so just use 256 >> segments per node, use parallel as repair parallelism, and set intensity to >> 1. >> >> You apparently have more than 3TB per node, and that kind of density is >> always challenging when it comes to run "fast" repairs. >> >> Cheers, >> >> Le mar. 22 mai 2018 à 07:28, Surbhi Gupta <surbhi.gupt...@gmail.com> a >> écrit : >> >>> We are on Dse 4.8.15 and it is cassandra 2.1. >>> What are the best configuration to use for reaper for 144 nodes with 256 >>> vnodes and it shows around 532TB data when we start opscenter repairs. >>> >>> We need to finish repair soon. >>> >>> On Mon, May 21, 2018 at 10:53 AM Alexander Dejanovski < >>> a...@thelastpickle.com> wrote: >>> >>>> Hi Subri, >>>> >>>> Reaper might indeed be your best chance to reduce the overhead of >>>> vnodes there. >>>> The latest betas include a new feature that will group vnodes sharing >>>> the same replicas in the same segment. This will allow to have less >>>> segments than vnodes, and is available with Cassandra 2.2 and onwards (the >>>> improvement is especially beneficial with Cassandra 3.0+ as such token >>>> ranges will be repaired in a single session). >>>> >>>> We have a gitter that you can join if you want to ask questions. >>>> >>>> Cheers, >>>> >>>> Le lun. 21 mai 2018 à 15:29, Surbhi Gupta <surbhi.gupt...@gmail.com> a >>>> écrit : >>>> >>>>> Thanks Abdul >>>>> >>>>> On Mon, May 21, 2018 at 6:28 AM Abdul Patel <abd786...@gmail.com> >>>>> wrote: >>>>> >>>>>> We have a paramater in reaper yaml file called >>>>>> repairManagerSchrdulingIntervalSeconds default is 10 seconds , i >>>>>> tested with 8,6,5 seconds and found 5 seconds optimal for my environment >>>>>> ..you go down further but it will have cascading effects in cpu and >>>>>> memory >>>>>> consumption. >>>>>> So test well. >>>>>> >>>>>> >>>>>> On Monday, May 21, 2018, Surbhi Gupta <surbhi.gupt...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> Thanks a lot for your inputs, >>>>>>> Abdul, how did u tune reaper? >>>>>>> >>>>>>> On Sun, May 20, 2018 at 10:10 AM Jonathan Haddad <j...@jonhaddad.com> >>>>>>> wrote: >>>>>>> >>>>>>>> FWIW the largest deployment I know about is a single reaper >>>>>>>> instance managing 50 clusters and over 2000 nodes. >>>>>>>> >>>>>>>> There might be bigger, but I either don’t know about it or can’t >>>>>>>> remember. >>>>>>>> >>>>>>>> On Sun, May 20, 2018 at 10:04 AM Abdul Patel <abd786...@gmail.com> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Hi, >>>>>>>>> >>>>>>>>> I recently tested reaper and it actually helped us alot. Even with >>>>>>>>> our small footprint 18 node reaper takes close to 6 hrs.<intially >>>>>>>>> took 13 >>>>>>>>> hrs ,i was able to tune it 50%>. But it really depends on number >>>>>>>>> nodes. For >>>>>>>>> example if you have 4 nodes then it runs on 4*256<vnodes> =1024 >>>>>>>>> segements , >>>>>>>>> so for your env. Ut will be 256*144 close to 36k segements. >>>>>>>>> Better test on poc box how much time it takes and then proceed >>>>>>>>> further ..i have tested so far in 1 dc only , we can actually have >>>>>>>>> seperate >>>>>>>>> reaper instance handling seperate dc but havent tested it yet. >>>>>>>>> >>>>>>>>> >>>>>>>>> On Sunday, May 20, 2018, Surbhi Gupta <surbhi.gupt...@gmail.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Hi, >>>>>>>>>> >>>>>>>>>> We have a cluster with 144 nodes( 3 datacenter) with 256 Vnodes . >>>>>>>>>> When we tried to start repairs from opscenter then it showed >>>>>>>>>> 1.9Million ranges to repair . >>>>>>>>>> And even after doing compaction and strekamthroughput to 0 , >>>>>>>>>> opscenter is not able to help us much to finish repair in 9 days >>>>>>>>>> timeframe . >>>>>>>>>> >>>>>>>>>> What is your thought on Reaper ? >>>>>>>>>> Do you think , Reaper might be able to help us in this scenario ? >>>>>>>>>> >>>>>>>>>> Thanks >>>>>>>>>> Surbhi >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>> Jon Haddad >>>>>>>> http://www.rustyrazorblade.com >>>>>>>> twitter: rustyrazorblade >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>> >>>>> -- >>>> ----------------- >>>> Alexander Dejanovski >>>> France >>>> @alexanderdeja >>>> >>>> Consultant >>>> Apache Cassandra Consulting >>>> http://www.thelastpickle.com >>>> >>>> >>>> -- >> ----------------- >> Alexander Dejanovski >> France >> @alexanderdeja >> >> Consultant >> Apache Cassandra Consulting >> http://www.thelastpickle.com >> > >
