On Tue, Jul 26, 2016 at 12:39 AM, Isuru Perera <[email protected]> wrote:
> Hi Indika, > > Yes, this is a known issue when using the exponentially-decaying reservoir > and when we see the problem clearly when we display the data in a time > series chart. > > In order to provide a solution, we need to implement a different reservoir > for metrics and we can use a project like HdrHistogram [1]. I'm planning to > include a new reservoir implementation in Carbon Metrics 2.1.0, which is > based on Carbon Kernel 5.1.0. > > Do you want this problem to be fixed in Carbon 4.x based release? > Yes. Because we are going to release analytics-mb along with message broker 3.2.0 which is based on carbon 4.x. > > [1] https://github.com/HdrHistogram/HdrHistogram > > On Mon, Jul 25, 2016 at 7:13 PM, Indika Sampath <[email protected]> wrote: > >> Hi Isuru, >> >> We were encounter there is an issue with timer stats in carbon-metrics >> due to its default reservoir which is exponentially decaying reservoir. As >> per the doc, it says A histogram with an exponentially decaying reservoir >> produces quantiles which are representative of (roughly) the last five >> minutes of data. Same issue mentioned in links [1][2] as well and they have >> provided some workaround to mitigate the issue. It would be great if you >> could provide a fix for this? >> >> [1] http://taint.org/2014/01/16/145944a.html >> [2] https://blog.filippo.io/understanding-metrics >> >> Cheers! >> >> -- >> Indika Sampath >> Senior Software Engineer >> WSO2 Inc. >> http://wso2.com >> >> Phone: +94 716 424 744 >> Blog: http://indikasampath.blogspot.com/ >> >> > > > -- > Isuru Perera > Associate Technical Lead | WSO2, Inc. | http://wso2.com/ > Lean . Enterprise . Middleware > > about.me/chrishantha > Contact: +IsuruPereraWSO2 <https://www.google.com/+IsuruPereraWSO2/about> > -- Indika Sampath Senior Software Engineer WSO2 Inc. http://wso2.com Phone: +94 716 424 744 Blog: http://indikasampath.blogspot.com/
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