mikejihbe/metrics

Histogram mean becomes NaN as sum becomes too large

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#13 opened on May 24, 2012

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Description

I have one metric based on a Histogram with about 90000 entries. The sum becomes huge... and the mean becomes NaN. Actually it becomes a strange number followed by NaNNaNNaN. e.g..

653238.5-217636.16666666666NaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaNNaN...

Contributor guide

Research direction
Investigate the histogram sum calculation for overflow or floating point precision issues. Check if the sum is being converted to a 32 bit integer or if a large sum causes NaN due to string conversion.
Tech stack
javascriptnodejs
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
JavaScriptNode.jsFloating point arithmetic
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60