Aliaksandr Valialkin
0cb66a8f95
app/vmselect/promql: fix corner-case calculation for ideriv
2019-08-16 11:59:50 +03:00
Aliaksandr Valialkin
1b5b9ced27
app/vmselect/promql: properly handle corner cases for rollup functions
2019-08-15 23:31:28 +03:00
Aliaksandr Valialkin
000c154641
app/vmselect/promql: tune automatic window adjustement
...
Increase the windows adjustement for small scrape intervals,
since they usually have higher jitter.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/139
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/134
2019-08-04 19:34:11 +03:00
Aliaksandr Valialkin
1d4ddadbb1
app/vmselect/promql: further increase the allowed jitter for scrape interval
...
Real-world production data shows higher jitter than 1/8 of scrape interval.
This may results in gaps on the graph. So increase the allowed jitter to 1/4
of scrape interval in order to reduce the probability of gaps on the graphs
over time series with high jitter for scrape_interval.
2019-08-02 20:16:41 +03:00
Aliaksandr Valialkin
ade7bc30db
app/vmselect/promql: tolerate higher jitter in scrape interval
...
Allow jitter for up to 1/8 instead of 1/16 for the scrape interval.
This should imrpove graphs when `step` is smaller than the `scrape_interval`.
2019-08-01 23:25:53 +03:00
Aliaksandr Valialkin
b9a16b93e7
app/vmselect/promql: allow adjusting window for default rollup function
...
Default rollup function is `last_over_time`. It must support adjusting
the provided window in order to prevent from gaps on the graph
for window values smaller than scrape interval.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/134
2019-07-31 00:45:58 +03:00
Aliaksandr Valialkin
858746fa6c
app/vmselect/promql: gracefully handle duplicate timestamps in irate and rollup_rate funcs
...
Previously such timestamps result in `+Inf` results. Now the previous timestamp is used
for the calculations.
2019-07-03 12:41:30 +03:00
Aliaksandr Valialkin
72a3050c41
app/vmselect/promql: consistency renaming: candlestick -> rollup_candlestick
2019-06-29 03:13:25 +03:00
Aliaksandr Valialkin
96342f1422
app/vmselect: add candlestick(m[d]) func for returning open, close, low and high rollups on the given time range d
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This function is frequently used in financial apps. See https://en.wikipedia.org/wiki/Candlestick_chart
2019-06-27 18:46:54 +03:00
Aliaksandr Valialkin
334cf253c7
app/vmselect/promql: adjust value returned by linearRegression to the end of time range like Prometheus does
...
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/71
2019-06-24 22:46:03 +03:00
Aliaksandr Valialkin
14cd628948
app/vmselect/promql: add sum2 and sum2_over_time, geomean and geomean_over_time funcs.
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These functions may be useful for statistic calculations.
2019-06-24 16:45:00 +03:00
Aliaksandr Valialkin
0eac538fc8
app/vmselect/promql: adjust the provided window only for range functions with dt in denominator
...
This should fix range function calculations such as `changes(m[d])` where `d` is smaller
than the scrape interval.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/72
2019-06-23 19:27:25 +03:00
Aliaksandr Valialkin
a4e040f5ef
app/vmselect/promql: typo fixes in comments
2019-06-21 23:22:54 +03:00
Aliaksandr Valialkin
c05d443791
app/vmselect/promql: add deriv_fast function for calculating fast derivative
...
`deriv_fast` calculates derivative based on the first and the last point on the interval
instead of calculating linear regression based on all the data points on the interval.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/73
2019-06-21 23:05:48 +03:00
Aliaksandr Valialkin
98eafdbd58
app/vmselect/promql: use linear regression in deriv func like Prometheus does
...
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/73
2019-06-21 22:54:34 +03:00
Aliaksandr Valialkin
f334908c22
app/vmselect/promql: ajdust data model to the model used in Prometheus
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Do not take into account data points on the range `[timestamp .. timestamp+step)`
when calculating value on the given `timestamp`.
Use only data points from the past when performing these calculations like Prometheus does.
This should reduce discrepancies between results returned by VictoriaMetrics
and results returned by Prometheus.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/72
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/71
2019-06-21 21:55:25 +03:00
Aliaksandr Valialkin
1836c415e6
all: open-sourcing single-node version
2019-05-23 00:18:06 +03:00
