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| intmc | aodh is totally unreliable | 10:02 |
|---|---|---|
| intmc | is anyone aware of this? | 10:02 |
| lxkong | intmc: hi, currently no one is maintaining Gnocchi, so I'm not sure the Gnocchi evaluator is totally functional. | 10:04 |
| intmc | it misses small variations, composed by only one sample matching the rule | 10:05 |
| lxkong | intmc: if you are using Gnocchi and you found some bugs, feel free to propose a patch | 10:05 |
| lxkong | i mean, gnocchi evaluator | 10:05 |
| intmc | :D I'm not sure my boss would let me spend time on this, but I'll ask | 10:06 |
| lxkong | intmc: then you have to carry your bugfix internally | 10:06 |
| intmc | however the fact the aodh doesn't evaluate the whole history for granularities smaller than the evaluation period is something that depends on the core of aodh or the gnocchi backend? | 10:07 |
| lxkong | intmc: if you get the answer 'yes', feel free to ask how to contribute | 10:07 |
| lxkong | intmc: sounds like in the aodh code | 10:08 |
| intmc | because that means that the definition of the archive-policy is not independent from the evaluation period, which is a configuration detail | 10:08 |
| lxkong | intmc: i'm not familiar with Gnocchi, so no comment :-( | 10:08 |
| intmc | the evaluation period should be a tradeoff between responsivness and CPU load, but if it only read a small subset of the samples of a higher granularity series, then it misses valid values | 10:08 |
| intmc | ok, so say the evaluator runs every 30 seconds, but you have a gnocchi series with 1 sec granularity, what aodh does is just reading 1 sample (it's actually 3 it seems, but never mind) from the series with 1 sec granularity, which means it will ignore all the other, potentially valid, 29 samples | 10:10 |
| intmc | even moments ago, aodh missed 1 valid sample from gnocchi, from a series with 30s granularity, 15s evaluation period | 10:11 |
| intmc | it can't be used in production then | 10:11 |
| intmc | btw, lxkong, you mean Gnocchi is unmaintained, or the backend part of aodh is unmaintained? | 10:13 |
| lxkong | "Gnocchi is unmaintained" | 10:19 |
| intmc | lxkong: ok... sad news | 10:20 |
| intmc | thank you! :) | 10:21 |
| lxkong | intmc: np | 10:25 |
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