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Fix to consolidate avg accuracy (#753)

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* The interval must fit exactly n times to the time range and query made so that the resulting avg will be exact

* Add interval fix also to trend query
This commit is contained in:
Tommi Palomäki
2020-05-15 14:08:12 +03:00
committed by GitHub
parent 77e39da60c
commit 1ae4b86ca9
2 changed files with 16 additions and 6 deletions
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12
src/datasource-zabbix/zabbix/connectors/sql/sqlConnector.js
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@@ -43,6 +43,12 @@ export class SQLConnector extends DBConnector {
let {intervalMs, consolidateBy} = options;
let intervalSec = Math.ceil(intervalMs / 1000);
// The interval must match the time range exactly n times, otherwise
// the resulting first and last data points will yield invalid values in the
// calculated average value in downsampleSeries - when using consolidateBy(avg)
let numOfIntervals = Math.ceil((timeTill - timeFrom) / intervalSec);
intervalSec = (timeTill - timeFrom) / numOfIntervals;
consolidateBy = consolidateBy || 'avg';
let aggFunction = dbConnector.consolidateByFunc[consolidateBy];
@@ -66,6 +72,12 @@ export class SQLConnector extends DBConnector {
let { intervalMs, consolidateBy } = options;
let intervalSec = Math.ceil(intervalMs / 1000);
// The interval must match the time range exactly n times, otherwise
// the resulting first and last data points will yield invalid values in the
// calculated average value in downsampleSeries - when using consolidateBy(avg)
let numOfIntervals = Math.ceil((timeTill - timeFrom) / intervalSec);
intervalSec = (timeTill - timeFrom) / numOfIntervals;
consolidateBy = consolidateBy || 'avg';
let aggFunction = dbConnector.consolidateByFunc[consolidateBy];