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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2021/09/01 15:01:00 UTC
[GitHub] [incubator-doris] Skysheepwang opened a new issue #6545: [Feature] Discussion of Histogram Metric in Doris and a Suggestion of Improvement
Skysheepwang opened a new issue #6545:
URL: https://github.com/apache/incubator-doris/issues/6545
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- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.
### Description
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<!--StartFragment-->
<p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-US>Two
Problems about Histogram Metric in Doris<o:p></o:p></span></b></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>There are two problems that should be
considered:<o:p></o:p></span></p>
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mso-bidi-font-family:DengXian;mso-bidi-theme-font:minor-latin'><span
style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>What is the limit that the
metric could reach, and if the limitation was exceeded, what is the handler of
it?<o:p></o:p></span></p>
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style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>How does the metric calculate
the percentile? Is it accurate or approximate?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Data structure:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
Interval | 0-1 | 1-2 | 2-2*1.5^1 | 2*1.5^1-2*1.5^2 | … | 2*1.5^(n-1)-2*1.5^n | … | ~UINT64_MAX
-- | -- | -- | -- | -- | -- | -- | -- | --
Count | C0 | C1 | C2 | C3 | … | CN+1 | … | C108
<p class=MsoNormal><span lang=EN-US style='color:white;mso-color-alt:windowtext'>F</span><span
lang=EN-US>or problem a, the count is stored as uint64_t, the maximum count of
data in a particular interval is 2^64 - 1 (about 1e19). When the count in an
interval is over 2^64, the count of it will overflow and there is no handler of
this situation.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>We should notice that although the count
might be overflow, the total memory usage is the same, which means that there will
not be a memory failure while using the histogram metric.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>As for problem b, the algorithm firstly calculates
a threshold that equal to the total amount of values times P (the percent), then
uses it to locates the interval of the percentile. Finally, it uses the lower
bound of the interval plus an approximate position value among the interval which
is estimated by the threshold. The percentile is an approximation.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>A suggestion is that we could add a handler
to solve the potential overflow problem or may set a threshold that when the number
of values are over it, the histogram metric automatically kick off the history
data (Like the LRU algorithm).<o:p></o:p></span></p>
<!--EndFragment-->
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### Use case
_No response_
### Related issues
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
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