Thanks a lot to share the result. Boa Sorte. ;-) Take care. Petris Silva
On Fri, Jul 21, 2017 at 12:19 PM, Felipe Esteves < felipe.este...@b2wdigital.com> wrote: > Hi, Petrus, > > Seems we've solved the problem, but it wasn't relationed to repair the > cluster or disk latency. > I've increased the memory available for Cassandra from 16GB to 24GB and > the performance was much improved! > The main symptom we've observed in Opscenter was a significantly decrease > in total compactions graph. > > Felipe Esteves > > Tecnologia > > felipe.este...@b2wdigital.com <seu.em...@b2wdigital.com> > > > > 2017-07-15 3:23 GMT-03:00 Petrus Gomes <petru...@gmail.com>: > >> Hi Felipe, >> >> Yes, try it and let us know how it goes. >> >> Thanks, >> Petrus Silva. >> >> On Fri, Jul 14, 2017 at 11:37 AM, Felipe Esteves < >> felipe.este...@b2wdigital.com> wrote: >> >>> Hi Petrus, thanks for the feedback. >>> >>> I couldn't found the percent repaired in nodetool info, C* version is >>> 2.1.8, maybe it's something newer than that? >>> >>> I'm analyzing this thread about num_token. >>> >>> Compaction is "compaction_throughput_mb_per_sec: 16", I don't get >>> pending compactions in Opscenter. >>> >>> One point I've noticed, is that Opscenter show "OS: Disk Latency" max >>> with high values when the problem occurs, but it doesn't reflect in server >>> directly monitoring, in these tools the IO and latency of disks seems ok. >>> But seems to me that "read repair attempted" is a bit high, maybe it >>> will explain the latency in reads. I will try to run a repair on cluster to >>> see how it goes. >>> >>> Felipe Esteves >>> >>> Tecnologia >>> >>> felipe.este...@b2wdigital.com <seu.em...@b2wdigital.com> >>> >>> Tel.: (21) 3504-7162 ramal 57162 >>> >>> Skype: felipe2esteves >>> >>> 2017-07-13 15:02 GMT-03:00 Petrus Gomes <petru...@gmail.com>: >>> >>>> How is your Percent Repaired when you run " nodetool info" ? >>>> >>>> Search for : >>>> "reduced num_token = improved performance ??" topic. >>>> The people were discussing that. >>>> >>>> How is your compaction is configured? >>>> >>>> Could you run the same process in command line to have a measurement? >>>> >>>> Thanks, >>>> Petrus Silva >>>> >>>> >>>> >>>> On Thu, Jul 13, 2017 at 7:49 AM, Felipe Esteves < >>>> felipe.este...@b2wdigital.com> wrote: >>>> >>>>> Hi, >>>>> >>>>> I have a Cassandra 2.1 cluster running on AWS that receives high read >>>>> loads, jumping from 100k requests to 400k requests, for example. Then it >>>>> normalizes and later cames another high throughput. >>>>> >>>>> To the application, it appears that Cassandra is slow. However, cpu >>>>> and disk use is ok in every instance, row cache is enabled and with almost >>>>> 100% hit rate. >>>>> >>>>> The logs from Cassandra instances doesn't have any errors, nor >>>>> tombstone messages or something liked that. It's mostly compactions and >>>>> G1GC operations. >>>>> >>>>> Any hints on where to investigate more? >>>>> >>>>> >>>>> Felipe Esteves >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> ------------------------------ >>>> >>>> Esta mensagem pode conter informações confidenciais e somente o >>>> indivíduo ou entidade a quem foi destinada pode utilizá-la. A transmissão >>>> incorreta da mensagem não acarreta a perda de sua confidencialidade. Caso >>>> esta mensagem tenha sido recebida por engano, solicitamos que o fato seja >>>> comunicado ao remetente e que a mensagem seja eliminada de seu sistema >>>> imediatamente. É vedado a qualquer pessoa que não seja o destinatário usar, >>>> revelar, distribuir ou copiar qualquer parte desta mensagem. Ambiente de >>>> comunicação sujeito a monitoramento. >>>> >>>> This message may include confidential information and only the intended >>>> addresses have the right to use it as is, or any part of it. A wrong >>>> transmission does not break its confidentiality. If you've received it >>>> because of a mistake or erroneous transmission, please notify the sender >>>> and delete it from your system immediately. This communication environment >>>> is controlled and monitored. >>>> >>>> B2W Digital >>>> >>>> >>>> >>> >>> >>> >>> >> > > >
