Aliaksandr Valialkin
7ca08945fd
app/vmselect/promql: fix q default b where b may have empty time series
2022-04-21 11:43:09 +03:00
Aliaksandr Valialkin
25b841c6ed
app/vmselect/promql: fix duplicate time series error on joins against time series filtered by values
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This should prevent from `duplicate time series` errors when executing the following query:
kube_pod_container_resource_requests{resource="cpu"} * on (namespace,pod) group_left() (kube_pod_status_phase{phase=~"Pending|Running"}==1)
where `kube_pod_status_phase{phase=~"Pending|Running"}==1` filters out diplicate time series
2022-04-20 22:21:20 +03:00
Aliaksandr Valialkin
0ef7a05fc0
app/vmselect/promql: rename removeNaNs() to more clear removeEmptySeries()
2022-04-20 19:53:24 +03:00
Aliaksandr Valialkin
3605e1743b
app/vmselect/promql: allow calling InitRollupResultCache+StopRollupResultCache multiple times during tests
2022-04-11 12:32:23 +03:00
Aliaksandr Valialkin
b843f0e229
app/vmselect: add fine-grained limits for the number of returned/scanned time series for various APIs
2022-03-26 11:28:14 +02:00
Aliaksandr Valialkin
99ee1c13c0
app/vmselect/promql: reduce the maximum number of label values, which can be propagated from one side of the binary operation to another side of the binary operation from 10K to 1K
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There are user reports that 10K unique values in a single label filter may lead to performance and memory usage issues
2022-02-24 04:03:28 +02:00
Aliaksandr Valialkin
244c23ea2c
lib/workingsetcache: reduce the default cache rotation period from hour to 20 minutes
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This should reduce memory usage under high time series churn rate
2022-02-23 13:42:27 +02:00
Aliaksandr Valialkin
989668beba
app/vmselect/promql: return at most one time series from absent_over_time() in the same way as Prometheus does
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2130
2022-02-12 15:46:43 +02:00
Aliaksandr Valialkin
1173964d8d
app/vmselect/promql: clarify comments on why the right side of if and and operators are executed at first
2022-02-03 00:26:42 +02:00
Aliaksandr Valialkin
10367d7e4c
app/vmselect/promql: do not push down filters, which enumerate more than 10k unique values
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Such filters may slow down time series search, so just skip them.
This is a follow-up for e7f1ceeb84https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1827
2022-02-02 23:42:25 +02:00
Aliaksandr Valialkin
13c2692ca1
app/vmselect/promql: properly handle foo or bar queries
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Such queries may miss `bar` results after the commit e7f1ceeb84
2022-02-01 17:43:10 +02:00
Aliaksandr Valialkin
02b2bfcff3
lib/bytesutil: split Resize* funcs to MayOverallocate and NoOverallocate for more fine-grained control over memory allocations
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Follow-up for f4989edd96https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2007
2022-02-01 11:20:20 +02:00
Aliaksandr Valialkin
784cdcb080
app/vmselect/promql: check for binary operation in case-insensitive manner when deciding which side of the operation to perform the first
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PromQL and MetricsQL operators are case-insensitive
2022-01-31 22:07:35 +02:00
Aliaksandr Valialkin
04d6596298
app/vmselect/promql: optimize queries, which join on _info metrics.
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Automatically add common filters from one side of binary operation
to the other side before sending the query to storage subsystem.
See https://grafana.com/blog/2021/08/04/how-to-use-promql-joins-for-more-effective-queries-of-prometheus-metrics-at-scale/
and https://www.robustperception.io/exposing-the-software-version-to-prometheus
2022-01-31 20:25:15 +02:00
Aliaksandr Valialkin
6232eaa938
lib/bytesutil: split Resize() into ResizeNoCopy() and ResizeWithCopy() functions
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Previously bytesutil.Resize() was copying the original byte slice contents to a newly allocated slice.
This wasted CPU cycles and memory bandwidth in some places, where the original slice contents wasn't needed
after slize resizing. Switch such places to bytesutil.ResizeNoCopy().
Rename the original bytesutil.Resize() function to bytesutil.ResizeWithCopy() for the sake of improved readability.
Additionally, allocate new slice with `make()` instead of `append()`. This guarantees that the capacity of the allocated slice
exactly matches the requested size. The `append()` could return a slice with bigger capacity as an optimization for further `append()` calls.
This could result in excess memory usage when the returned byte slice was cached (for instance, in lib/blockcache).
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2007
2022-01-25 15:28:42 +02:00
Aliaksandr Valialkin
cc76174387
app/vmselect/promql: properly keep metric names when optimized path is used for aggregate function calculations
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For example, `sum(rate(...) keep_metric_names) by (__name__)` didn't leave the original metric name because of this issue.
This is a follup-up for 1bdc71d917https://github.com/VictoriaMetrics/VictoriaMetrics/issues/949
2022-01-17 15:33:39 +02:00
Aliaksandr Valialkin
5a1e4a140f
app/vmselect/promql: implement keep_metric_names modifier for transform and rollup functions
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/949
2022-01-14 04:15:35 +02:00
Aliaksandr Valialkin
53c9a81f2b
app/vmselect/promql: add stale_samples_over_time() function
2022-01-14 01:49:24 +02:00
Aliaksandr Valialkin
0580a58feb
app/vmselect/promql: add support for @ modifier
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Add support for `@` modifier in MetricsQL according to https://prometheus.io/docs/prometheus/latest/querying/basics/#modifier
Extend the support with the following features:
* Allow using `@` modifier everywhere in the query. For example, `sum(foo) @ end()`
* Allow using arbitrary expression as `@` modifier. For example, `foo @ (end() - 1h)`
returns `foo` value at `end - 1 hour` timestamp on the selected time range `[start ... end]`
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1348
2022-01-13 22:15:19 +02:00
Aliaksandr Valialkin
7d635a2311
app/vmselect/promql: fix limit_offset() test
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The test has been broken in addae7fc6a
2022-01-13 16:58:47 +02:00
Aliaksandr Valialkin
3396f08874
app/vmselect/promql: follow-up after 177e345d8a
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* Document changes_prometheus(), increase_prometheus() and delta_prometheus() functions.
* Simplify their implementation
* Mention these functions in docs/CHANGELOG.md
2021-12-20 13:15:06 +02:00
匠心零度
cc4725843b
add Prometheus semantics function :changes_prometheus、delta_prometheus、increase_prometheus ( #1972 )
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Co-authored-by: lirenzuo <lirenzuo@shein.com>
2021-12-20 13:15:05 +02:00
Aliaksandr Valialkin
c170841951
app/vmselect/promql: add timestamp_with_name(m[d]) function
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This function works the same as `timestamp()`, but doesn't remove source time series names.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/949#issuecomment-995222388
2021-12-15 23:38:09 +02:00
Aliaksandr Valialkin
addae7fc6a
app/vmselect/promql: preserve the order of time series passed to limit_offset() function
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Previously time series passed to `limit_offset()` were shuffled according to hash for their labels.
This was unexpected behaviour for most users.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1920 and https://github.com/VictoriaMetrics/VictoriaMetrics/issues/951
2021-12-12 18:07:15 +02:00
Aliaksandr Valialkin
54d4a1c959
app/vmselect: accept optional extra_filters[] query args for all the supported Prometheus querying APIs
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1863
2021-12-06 17:33:49 +02:00
Michael Fuller
8a94dd36d1
vmselect: in promql evaluation, return bytes requested when rollup memory limiter is unable to satisfy the request ( #1838 )
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Co-authored-by: Michael Fuller <mfuller@digitalocean.com>
2021-11-29 12:14:55 +02:00
Aliaksandr Valialkin
84decc4254
app/vmselect/promql: consistently return zero from deriv(const)
2021-11-17 18:01:58 +02:00
Aliaksandr Valialkin
aa6d11a33f
app/vmselect/promql: add now() function, which returns the current timestamp as a floating-point value in seconds
2021-11-17 16:42:11 +02:00
Aliaksandr Valialkin
1eb756fd11
app/vmselect/promql: arrange function names in the code in alphabetical order
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This should simplify code maintenance in the future
2021-11-14 13:54:43 +02:00
Aliaksandr Valialkin
82cf9f26db
app/vmselect/promql: prevent from incorrect calculations for deriv() over multiple samples with identical timestamps
2021-11-12 13:53:30 +02:00
Aliaksandr Valialkin
31486f2244
app/vmselect/promql: properly return durations smaller than one second from duration_over_time() function
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1780
2021-11-09 11:42:43 +02:00
Aliaksandr Valialkin
3a1ac218ba
app/vmselect/promql: add duration_over_time(m[d], max_interval) function
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This function calculates the actual lifetime of the time series on the given lookbehdind window `d`
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1780
2021-11-08 13:14:57 +02:00
Aliaksandr Valialkin
a102fca4ac
app/vmselect/promql: add limit_offset(limit, offset, q) function, which can be used for paging over big number of time series
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1778
2021-11-03 16:03:10 +02:00
Aliaksandr Valialkin
43bf0333eb
app/vmselect/promql: add label_graphite_group() function for extracting groups from Graphite metric names
2021-11-03 13:20:34 +02:00
Aliaksandr Valialkin
99784b21c1
all: fix build issues and tests for Apple M1
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1653
2021-10-27 15:07:19 +03:00
Aliaksandr Valialkin
d8ce86d685
app/vmselect/promql: reduce the precision from 15 significant digits to 13 significant digits when comparing float64 results in tests
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1738
2021-10-24 13:32:25 +03:00
Aliaksandr Valialkin
ed994873fd
app/vmselect/promql: randomize the static selection of time series returned from limitk()
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Sort series by a hash calculated from the series labels. This should guarantee "random" selection of the returned time series.
Previously the selection could be biased, since time series were sorted alphabetically by label names and label values.
2021-10-16 21:16:34 +03:00
Aliaksandr Valialkin
da0adf446d
app/vmselect/promql: typo fix in comment: didsn't -> didn't
2021-10-16 13:00:10 +03:00
Aliaksandr Valialkin
48c3668b3d
app/vmselect/promql: add atan2 binary operator, which is going to be added in Prometheus 2.31
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See https://github.com/prometheus/prometheus/pull/9248
2021-10-11 21:17:23 +03:00
Aliaksandr Valialkin
b3d28f3872
app/vmselect/promql: add missing trigonometric functions, which are going to be added in Prometheus 2.31
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See https://github.com/prometheus/prometheus/issues/9233
2021-10-11 21:17:21 +03:00
Aliaksandr Valialkin
f1e1d20ac4
app/vmselect/promql: consistently return the same set of time series from limitk() function
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This is the expected behaviour by most users.
2021-10-08 19:55:29 +03:00
Aliaksandr Valialkin
cbf01f7384
app/vmselect/promql: substitute rollupFuncsCannotAdjustWindow with rollupFuncsCanAdjustWindow
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The list of functions, which can adjust lookbehind window is more limited than the rest of functions,
so it is better from maintainability and readability PoV using the allowlist instead of blocklist.
2021-10-07 13:19:22 +03:00
Aliaksandr Valialkin
7e6ec0bbe9
app/vmselect/promql: return back the behaviour for deriv() function when the lookbehind window doesnt contain enough points
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It is expected that the `deriv(m[d])` returns non-empty value if the lookbehind window `d`
contains less than 2 samples in the same way as `rate()` does.
This is a follow-up after 3e084be06b
2021-10-07 12:55:58 +03:00
Roman Khavronenko
0a8804d6aa
app/vmselect: make predict_linear and deriv compatible with Prometheus ( #1681 )
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Previously, `predict_linear` returned slightly different results comparing
to Prometheus. The change makes linear regression algorithm compatible
with Prometheus.
`deriv` was excluded from the list of functions which can adjust the time
window for the same reasons.
2021-10-07 12:55:56 +03:00
Aliaksandr Valialkin
ec6eb03d65
app/vmselect/promql: add topk_last and bottomk_last functions
2021-09-30 13:23:27 +03:00
Roman Khavronenko
95ddfda894
app/vmselect: fix binary comparison func ( #1667 )
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The fix makes the binary comparison func to check for NaNs
before executing the actual comparison. This prevents VM
to return values for non-existing samples for expressions
which contain bool comparisons. Please see added test
for example.
2021-09-30 13:04:10 +03:00
Roman Khavronenko
57eb5ef194
app/vmselect: fix testRowsEqual func NaN checks ( #1666 )
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It appeared, that `testRowsEqual` NaN comparison was incorrect.
The fix caused some tests to fail. Please see the change and
tests updated.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2021-09-30 13:04:08 +03:00
Roman Khavronenko
444a8882f4
app/vmselect: disable time-window adjustment for min/max_over_time funcs ( #1658 )
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Adjustment results into discrepancy between Prometheus and VM on time windows
smaller than scrape interval.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2021-09-29 00:43:54 +03:00
Roman Khavronenko
f46f847531
app/vmselect: always return zero for stddev func if there is only one value ( #1659 )
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The fix will always return zero if received set of items consists of one
element only, which also means no deviation.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2021-09-29 00:42:19 +03:00
Roman Khavronenko
72468c9d75
app/vmselect: return NaN instead of 0 for empty value sets ( #1660 )
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The change affects `count/stddev/stdvar_over_time` funcs and makes
them to return NaN instead of zero when there is no datapoints
in a time window.
This is needed for improving compatibility with Prometheus.
Signed-off-by: hagen1778 <roman@victoriametrics.com>
2021-09-29 00:38:24 +03:00
