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Author SHA1 Message Date
Haleygo
a0752b20c7
vmselect: fix result in Prometheus query when time is small (#4578) 
vmselect: fix result in Prometheus query when time is small

Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>
 2023-08-12 13:32:05 -07:00
Aliaksandr Valialkin
744517829d
app/vmselect/promql: typo fix after e7f46a0aab 2023-03-25 01:25:43 -07:00
Aliaksandr Valialkin
a7079022ff
app/vmselect/promql: follow-up for 7205c79c5a 
- Allocate and initialize seriesByWorkerID slice in a single go instead
  of initializing every item in the list separately.
  This should reduce CPU usage a bit.
- Properly set anti-false sharing padding at timeseriesWithPadding structure
- Document the change at docs/CHANGELOG.md

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966
 2023-03-25 01:24:48 -07:00
Zakhar Bessarab
36da3faf73
app/vmselect/promql: use lock-less approach to gather results of parallel processing for evalRollup* funcs (#4004) 
* vmselect/promql: refactor `evalRollupNoIncrementalAggregate` to use lock-less approach for parallel workers computation

Locking there is causing issues when running on highly multi-core system as it introduces lock contention during results merge.

New implementation uses lock less approach to store results per workerID and merges final result in the end, this is expected to significantly reduce lock contention and CPU usage for systems with high number of cores.

Related: #3966
Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>

* vmselect/promql: add pooling for `timeseriesWithPadding` to reduce allocations

Related: #3966
Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>

* vmselect/promql: refactor `evalRollupFuncWithSubquery` to avoid using locks

Uses same approach as `evalRollupNoIncrementalAggregate` to remove locking between workers and reduce lock contention.

Related: #3966
Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>

---------

Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
 2023-03-25 01:23:46 -07:00
Aliaksandr Valialkin
bc9bd614ee
app/vmselect/promql: pass workerID to the callback inside doParallel() 
This opens the possibility to remove tssLock from evalRollupFuncWithSubquery()
in the follow-up commit from @zekker6 in order to speed up the code
for systems with many CPU cores.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3966
 2023-03-25 01:22:06 -07:00
Aliaksandr Valialkin
27afe7bc38
app/vmselect/promql: reduce the number of memory allocations inside getCommonLabelFilters() 
This should improve performance a bit for `q1 op q2` queries
 2023-01-15 13:03:23 -08:00
Aliaksandr Valialkin
7067e8206c
app/vmselect/promql: reduce memory allocations at getCommonLabelFilters() function 
Intern tag keys and values there
 2023-01-12 01:27:41 -08:00
Aliaksandr Valialkin
31fc29599f
app/vmselect/promql: move the eval function args in parallel query trace outside the loop 2023-01-10 22:23:30 -08:00
Aliaksandr Valialkin
b796a0dc3f
app/vmselect/promql: optimize e1 op e2 when e1 returns an empty result 
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3349
 2022-11-21 16:09:10 +02:00
Aliaksandr Valialkin
b8da90b893
app/vmselect/promql: properly handle zero and negative values for -search.maxMemoryPerQuery 
This is a follow-up for 04a05f161c

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3203
 2022-10-12 09:25:17 +03:00
Aliaksandr Valialkin
04a05f161c
app/vmselect: return back the logic for limits the amounts of memory occupied by concurrently executed queries if -search.maxMemoryPerQuery isn't set 
This is needed for preserving backwards compatibility with the previous releases of VictoriaMetrics.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3203
 2022-10-10 21:45:13 +03:00
Aliaksandr Valialkin
5138eaeea0
app/vmselect: allow limiting per-query memory usage via -search.maxMemoryPerQuery command-line flag 
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3203
 2022-10-08 01:08:05 +03:00
Dmytro Kozlov
4415c71a2b
vmselect/{promql, prometheus}: show flag names which user can update in error message (#3049) 
* vmselect/{promql, prometheus}: show flag names which user can update in error message

* vmselect/{promql, prometheus}: fix typo
 2022-09-06 13:25:59 +03:00
Aliaksandr Valialkin
4076277cf0
app/vmselect/promql: evaluate union() args in parallel in order to increase query performance 
Note that the parallel execution of `union()` args may take more memory and CPU time
than the sequential execution if args contain heavy queries, which may load all the available CPU,
disk and memory resources and vmselect and vmstorage levels.
 2022-09-02 19:46:27 +03:00
Aliaksandr Valialkin
ad11b8d83d
app/vmselect/promql: follow-up after 2d71b4859c 
- Use getScalar() function for obtaining the expected scalar from phi arg
- Reduce the error message returned to the user when incorrect phi is passed to histogram_quantiles
- Improve the description of this bugfix in the docs/CHANGELOG.md

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3026
 2022-08-27 01:35:49 +03:00
Dmytro Kozlov
463ea6897b
vmselect/promql: enable search.maxPointsSubqueryPerTimeseries for sub-queries (#2963) 
* vmselect/promql: enable search.maxPointsPerTimeSeriesSubquery for sub-queries

* vmselect/promql: cleanup

* vmselect/promql: rename config flag

* vmselect/promql: add tests

* vmselect/promql: use test object instead of log

* vmselect/promql: fix posible panic is subquery has more points. add description

* vmselect/promql: update tests descriptions

* vmselect/promql: update doInternal validation

* vmselect/promql: fix linter

* vmselect/promql: fix linter

* vmselect/promql: update documentation and release notes

* wip

- Properly apply -search.maxPointsSubqueryPerTimeseries limit to subqueries.
  Previously the -search.maxPointsPerTimeseries limit was unexpectedly applied to subqueries
  if it was smaller than the -search.maxPointsSubqueryPerTimeseries .
- Clarify docs for -search.maxPointsSubqueryPerTimeseries command-line flag .
- Document -search.maxPointsPerTimeseries and -search.maxPointsSubqueryPerTimeseries flags at https://docs.victoriametrics.com/#resource-usage-limits .
- Update docs/CHANGELOG.md .

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2922

Co-authored-by: Aliaksandr Valialkin <valyala@victoriametrics.com>
 2022-08-24 15:25:18 +03:00
Aliaksandr Valialkin
4ac79d29ad
app/vmselect: follow-up after 63e0f16062 
* Explicitly store a pointer to UserReadableError in the error interface.
  Previously Go automatically converted the value to a pointer before storing in the error interface.

* Add Unwrap() method to UserReadableError, so it can be used transparently with the other code,
  which calls errors.Is() and errors.As().

* Document the change in docs/CHANGELOG.md
 2022-08-15 13:50:16 +03:00
Roman Khavronenko
63e0f16062
vmselect: introduce UserReadableError type of error (#2894) 
When read query fails, VM returns rich error message with
all the details. While these details might be useful
for debugging specific cases, they're usually too verbose
for users.
Introducing a new error type `UserReadableError` is supposed
to allow to return to user only the most important parts
of the error trace. This supposed to improve error readability
in web interfaces such as VMUI or Grafana.

The full error trace is still logged with the full context
and can be found in vmselect logs.

Signed-off-by: hagen1778 <roman@victoriametrics.com>

Signed-off-by: hagen1778 <roman@victoriametrics.com>
 2022-08-15 13:38:47 +03:00
Roman Khavronenko
9ccf695d57
vmselect: return correct error for second part of expression (#2893) 
Signed-off-by: hagen1778 <roman@victoriametrics.com>
 2022-07-20 16:44:28 +02:00
Aliaksandr Valialkin
cc7d499bbd
app/vmselect/promql: execute q1 and q2 from q1 op q2 in parallel if labels pushdown cannot be applied 
This should improve query performance if VictoriaMetrics has enough resources for processing `q1` and `q2` in parallel.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2886
 2022-07-19 14:27:48 +03:00
Aliaksandr Valialkin
c2197ad139
app/vmselect/promql: validate function name before evaluating its arguments 
This avoids unneeded evaluation of args for unknown functions
 2022-07-12 19:48:26 +03:00
Aliaksandr Valialkin
3e2dd85f7d
all: readability improvements for query traces 
- show dates in human-readable format, e.g. 2022-05-07, instead of a numeric value
- limit the maximum length of queries and filters shown in trace messages
 2022-06-30 18:20:33 +03:00
Aliaksandr Valialkin
a14188dd8e
app/vmselect: expose additional histograms at /metrics page, which may help get more insights for the query workload 
This commit is based on https://github.com/VictoriaMetrics/VictoriaMetrics/pull/2792
 2022-06-28 20:18:13 +03:00
Aliaksandr Valialkin
a43f2d0bc5
app/vmselect/promql: show the number of scanned samples in the query trace 2022-06-28 19:26:17 +03:00
Aliaksandr Valialkin
e578549b8a
app/vmselect: optimize /api/v1/series a bit for time ranges smaller than one day 2022-06-28 13:02:47 +03:00
Aliaksandr Valialkin
a963b2a0aa
all: show timeRange in traces in human-readable format instead of timestamps in milliseconds 2022-06-27 13:45:51 +03:00
Aliaksandr Valialkin
12ac255dae
lib/querytracer: make it easier to use by passing trace context message to New and NewChild 
The context message can be extended by calling Donef.
If there is no need to extend the message, then just call Done.
 2022-06-08 21:06:52 +03:00
Aliaksandr Valialkin
41958ed5dd
all: add initial support for query tracing 
See https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#query-tracing

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1403
 2022-06-01 02:29:23 +03:00
Aliaksandr Valialkin
6e364e19ef
app/vmselect: add fine-grained limits for the number of returned/scanned time series for various APIs 2022-03-26 11:29:49 +02:00
Aliaksandr Valialkin
0d47c23a03
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 
There are user reports that 10K unique values in a single label filter may lead to performance and memory usage issues
 2022-02-24 04:05:18 +02:00
Aliaksandr Valialkin
b1f94f7f0e
app/vmselect/promql: return at most one time series from absent_over_time() in the same way as Prometheus does 
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2130
 2022-02-12 15:45:09 +02:00
Aliaksandr Valialkin
96b7de6736
app/vmselect/promql: clarify comments on why the right side of if and and operators are executed at first 2022-02-03 00:26:14 +02:00
Aliaksandr Valialkin
4b850c2a59
app/vmselect/promql: do not push down filters, which enumerate more than 10k unique values 
Such filters may slow down time series search, so just skip them.

This is a follow-up for e7f1ceeb84

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1827
 2022-02-02 23:40:02 +02:00
Aliaksandr Valialkin
2016a2c899
app/vmselect/promql: properly handle foo or bar queries 
Such queries may miss `bar` results after the commit e7f1ceeb84
because common label filters from `foo` could be mistakenly applied to `bar`.
 2022-02-01 17:40:51 +02:00
Aliaksandr Valialkin
a8d22e1223
app/vmselect/promql: check for binary operation in case-insensitive manner when deciding which side of the operation to perform the first 
PromQL and MetricsQL operators are case-insensitive
 2022-01-31 22:06:15 +02:00
Aliaksandr Valialkin
e7f1ceeb84
app/vmselect/promql: optimize queries, which join on _info metrics. 
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 19:32:36 +02:00
Aliaksandr Valialkin
dc7b63a793
app/vmselect/promql: properly keep metric names when optimized path is used for aggregate function calculations 
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 1bdc71d917

Udates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/949
 2022-01-17 15:30:30 +02:00
Aliaksandr Valialkin
1bdc71d917
app/vmselect/promql: implement keep_metric_names modifier for transform and rollup functions 
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/949
 2022-01-14 04:14:59 +02:00
Aliaksandr Valialkin
f41846d002
app/vmselect/promql: add stale_samples_over_time() function 2022-01-14 01:48:04 +02:00
Aliaksandr Valialkin
c883c15878
app/vmselect/promql: add support for @ modifier 
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 22:12:06 +02:00
Aliaksandr Valialkin
ff15a752c1
app/vmselect: accept optional extra_filters[] query args for all the supported Prometheus querying APIs 
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1863
 2021-12-06 17:07:09 +02:00
Michael Fuller
cf8c171f85
vmselect: in promql evaluation, return bytes requested when rollup memory limiter is unable to satisfy the request (#1838) 
Co-authored-by: Michael Fuller <mfuller@digitalocean.com>
 2021-11-22 13:20:42 +03:00
Aliaksandr Valialkin
9a3d0c43b5 app/vmselect/promql: add quantiles_over_time("phiLabel", phi1, ..., phiN, m[d]) function for calculating multiple quantiles at once 2021-09-17 23:35:10 +03:00
Aliaksandr Valialkin
cdc372bb98 app/vmselect: add -search.noStaleMarkers command-line flag for disabling stale markers handling in queries 
This option allows reducing CPU usage a bit when VictoriaMetrics is used
for collecting and processing non-Prometheus data. For example, InfluxDB line protocol, Graphite, OpenTSDB, CSV, etc.
 2021-08-18 13:59:02 +03:00
Aliaksandr Valialkin
bd14b0887e app/vmselect/promql: move common condition to dropStaleNaNs in order to improve code maintainability 2021-08-17 11:01:16 +03:00
Aliaksandr Valialkin
113f0a8a07 app/vmselect/promql: drop staleness marks before calling rollupConfig.Do 
This allows dropping staleness marks only once and then calculate multiple rollup functions on the result.

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1526
 2021-08-15 13:21:10 +03:00
Aliaksandr Valialkin
a925d5a3e1 app/vmselect/promql: duration handling improvements in MetricsQL queries 
- Support durations anywhere in MetricsQL queries. E.g. sum_over_time(m[1h])/1h is equivalent to sum_over_time(m[1h])/3600
- Support durations without suffix. E.g. rate(m[300]) is equivalent to rate(m[5m])
 2021-07-12 17:16:41 +03:00
Aliaksandr Valialkin
71b72304ae app/vmselect: improve description for -search.maxPointsPerTimeseries command-line flag 2021-03-22 16:45:34 +02:00
Aliaksandr Valialkin
2dae0a2c47 app/vmselect: add round_digits query arg to /api/v1/query and /api/v1/query_range handlers for limiting the number of decimal digits after the point 2021-03-15 12:36:33 +02:00
Aliaksandr Valialkin
2d33230793 app/vmselect/promql: properly make copies of EvalConfig 2021-02-11 12:41:15 +02:00