confused by node_gets vs node_gets stats

Oleksiy Krivoshey oleksiyk at gmail.com
Sun Dec 7 10:37:54 EST 2014


I guess those splashes were caused by AAE, because eventually it became
normal:

https://www.dropbox.com/s/zjemsub9astjhiw/Screenshot%202014-12-07%2017.36.45.png?dl=0

On 6 December 2014 at 14:27, Oleksiy Krivoshey <oleksiyk at gmail.com> wrote:

> Hi,
>
> Can someone please explain the strange behaviour I'm experiencing with
> node_gets stats vs vnode_gets on this histograms (screenshot):
>
>
> https://www.dropbox.com/s/yrd7wg5q4ipfvk0/Screenshot%202014-12-06%2014.16.13.png?dl=0
>
> According to:
> http://docs.basho.com/riak/latest/ops/running/nodes/inspecting/
>
> node_gets - Number of GETs coordinated by this node, including GETs to
> non-local vnodes in the last minute
>
> vnode_gets - Number of GET operations coordinated by local vnodes on this
> node in the last minute
>
> My questions which I don't understand:
>
> 1. How can vnode_gets be larger than node_gets by 50x on a 5 node cluster?
> If I understand the doc correctly, it can't be larger than sum of node_gets
> on all nodes?
>
> 2. I can't explain those periodic splashes in vnode_gets each hour. There
> are no such splashes on node_gets at the same periods and there is no
> periodic load caused by my application. What can be the reason? AAE?
>
> Thanks!
>
> --
> Oleksiy Krivoshey
>



-- 
Oleksiy Krivoshey
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