feat(canary): Add test to check query results with and without cache. #13104

kavirajk · 2024-06-03T09:41:27Z

What this PR does / why we need it:
Recently, we added support for Cache-Control header for loki.

This PR uses it to test if same query for same data returns same results with and without results cache.

Easy to catch any bug in results cache if there are any differences.

NOTE: This currently does count_over_time instant query for the cache test. In future we can extend it for range queries as well.

This PR introduces to additional metrics for loki-canary to track any differences in this test.

loki_canary_cache_test_query_results_total{status=~"success|fail"}
loki_canary_cache_test_query_results_diff_total

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

This is one of the step to gain more confidence on recently added "results cache" support for instant query.

Manually ingested logs with older timestamps to create discrepancy with results cache. And counters seems to be working fine.

# HELP loki_canary_cache_test_query_results_diff_total counts number of times the query results was different with and without cache 
# TYPE loki_canary_cache_test_query_results_diff_total counter
loki_canary_cache_test_query_results_diff_total 16
# HELP loki_canary_cache_test_query_results_total counts number of times the query results test requests are done 
# TYPE loki_canary_cache_test_query_results_total counter
loki_canary_cache_test_query_results_total{status="success"} 23

Checklist

Reviewed the CONTRIBUTING.md guide (required)
Documentation added
Tests updated
Title matches the required conventional commits format, see here
- Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
For Helm chart changes bump the Helm chart version in production/helm/loki/Chart.yaml and update production/helm/loki/CHANGELOG.md and production/helm/loki/README.md. Example PR
If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

Add new test to check correctness of queries with and without cache. Currently only for `Count_over_time` instant metric query Signed-off-by: Kaviraj <[email protected]>

Signed-off-by: Kaviraj <[email protected]>

MichelHollands

Some cosmetic changes required but otherwise fine

MichelHollands · 2024-06-03T12:55:33Z

cmd/loki-canary/main.go

@@ -79,6 +79,10 @@ func main() {
 	metricTestQueryRange := flag.Duration("metric-test-range", 24*time.Hour, "The range value [24h] used in the metric test instant-query."+
 		" Note: this value is truncated to the running time of the canary until this value is reached")

+	cacheTestInterval := flag.Duration("cache-test-interval", 15*time.Minute, "The interval the cache test query should be run")
+	cacheTestQueryRange := flag.Duration("cache-test-range", 24*time.Hour, "The range value [24h] used in the cache test instant-query.")
+	cacheTestQueryNow := flag.Duration("cache-test-now", 1*time.Hour, "duration how far back from current time the execustion time (--now) should be set for running this query in the cache test instant-query.")


Suggested change

cacheTestQueryNow := flag.Duration("cache-test-now", 1*time.Hour, "duration how far back from current time the execustion time (--now) should be set for running this query in the cache test instant-query.")

cacheTestQueryNow := flag.Duration("cache-test-now", 1*time.Hour, "duration how far back from current time the execution time (--now) should be set for running this query in the cache test instant-query.")

MichelHollands · 2024-06-03T12:56:42Z

pkg/canary/comparator/comparator.go

-	done                chan struct{}
+	cacheTestInterval   time.Duration
+	cacheTestRange      time.Duration
+	// how far back from current time the execustion time (--now) should be set for running this query.


Suggested change

// how far back from current time the execustion time (--now) should be set for running this query.

// how far back from current time the execution time (--now) should be set for running this query.

MichelHollands · 2024-06-03T12:57:43Z

pkg/canary/comparator/comparator.go

+	cacheTestRange      time.Duration
+	// how far back from current time the execustion time (--now) should be set for running this query.
+	cacheTestNow time.Duration
+


For consistency this empty line can be removed

MichelHollands · 2024-06-03T13:01:15Z

pkg/canary/comparator/comparator_test.go

+	// seems ugly but was easy, and multiple instantiations
+	// of the comparator should be an error
+	prometheus.Unregister(responseLatency)
+


Empty line can be removed

Signed-off-by: Kaviraj <[email protected]>

kavirajk · 2024-06-03T15:51:08Z

Thanks @MichelHollands addressed your comments.

kavirajk · 2024-06-03T15:55:42Z

Checked with internal dev loki clusters. Manually ingested some logs with old timestamp to create the diff.

@grafanabot

commit 35585db Merge: 1822b88 47f0236 Author: Trevor Whitney <[email protected]> Date: Mon Jun 3 11:43:12 2024 -0600 Merge branch 'main' into sample-count-and-bytes commit 1822b88 Author: Trevor Whitney <[email protected]> Date: Mon Jun 3 11:42:52 2024 -0600 fix: formatting commit 47f0236 Author: Dylan Guedes <[email protected]> Date: Mon Jun 3 14:41:55 2024 -0300 feat: Introduce `index audit` to `lokitool` (#13008) Adds a new `index audit` command to the `lokitool` cmd. The new `index audit` validates that all chunks required by a given index are available at the object storage. This is useful to validate if you're missing data after a backfill or when migrating data from one Loki instance to another. See `pkg/tool/audit/README.md` for usage instructions. commit 71507a2 Author: Kaviraj Kanagaraj <[email protected]> Date: Mon Jun 3 18:18:39 2024 +0200 feat(canary): Add test to check query results with and without cache. (#13104) Signed-off-by: Kaviraj <[email protected]> commit 7942e57 Merge: 6ed195e 8084259 Author: Trevor Whitney <[email protected]> Date: Mon Jun 3 09:27:58 2024 -0600 Merge branch 'main' into sample-count-and-bytes commit 6ed195e Author: Trevor Whitney <[email protected]> Date: Mon Jun 3 09:25:37 2024 -0600 fix: nanosecond values in test with non-decimal seconds value commit 8084259 Author: Yuri Kotov <[email protected]> Date: Mon Jun 3 21:30:25 2024 +0700 feat: API: Expose optional label matcher for label names API (#11982) Co-authored-by: Cyril Tovena <[email protected]> commit 09faea8 Author: Yoshitaka Fujii <[email protected]> Date: Mon Jun 3 21:16:10 2024 +0900 docs: Fix link in examples (#13094) Co-authored-by: J Stickler <[email protected]> commit c8cc0fb Author: Grot (@grafanabot) <[email protected]> Date: Mon Jun 3 12:39:26 2024 +0100 chore( operator): community release 0.6.1 (#12593) commit fbd2739 Author: Joao Marcal <[email protected]> Date: Mon Jun 3 12:15:47 2024 +0200 chore(operator): prepare community release v0.6.1 (#13105) commit 4f3ed77 Author: Robert Jacob <[email protected]> Date: Mon Jun 3 11:02:15 2024 +0200 fix(operator): Use a minimum value for replay memory ceiling (#13066) commit cbf9fc0 Author: Trevor Whitney <[email protected]> Date: Fri May 31 16:46:39 2024 -0600 docs: update docs commit 29febb7 Author: Trevor Whitney <[email protected]> Date: Fri May 31 16:42:12 2024 -0600 chore: make format commit 87f7282 Author: Trevor Whitney <[email protected]> Date: Fri May 31 16:34:48 2024 -0600 chore: clean up linting commit abb31a8 Merge: 33ead60 00d3c7a Author: Trevor Whitney <[email protected]> Date: Fri May 31 16:10:58 2024 -0600 Merge branch 'main' into sample-count-and-bytes commit 33ead60 Author: Trevor Whitney <[email protected]> Date: Fri May 31 16:03:04 2024 -0600 feat: hook up samples endpoint commit eb84303 Author: Trevor Whitney <[email protected]> Date: Fri May 31 13:07:49 2024 -0600 chore: a bit of cleanup commit 6dd77ae Author: Trevor Whitney <[email protected]> Date: Fri May 31 12:56:05 2024 -0600 feat: refactor metric samples to be it's own endpoint commit 2587657 Author: Trevor Whitney <[email protected]> Date: Fri May 24 17:35:15 2024 -0600 fix: grouping commit b897fc5 Author: Trevor Whitney <[email protected]> Date: Fri May 24 13:36:00 2024 -0600 fix: ring proxy methods on pattern ring_client commit 0bfd0ad Merge: 68aa188 efdae3d Author: Trevor Whitney <[email protected]> Date: Thu May 23 17:04:32 2024 -0600 Merge branch 'main' into sample-count-and-bytes commit 68aa188 Author: Trevor Whitney <[email protected]> Date: Thu May 23 17:03:32 2024 -0600 feat: guard aggregation behavior behind a feature flag commit f0d6a92 Author: Trevor Whitney <[email protected]> Date: Thu May 23 14:03:32 2024 -0600 feat: reject filter queries to /patterns endpoint commit dc620e7 Author: Trevor Whitney <[email protected]> Date: Wed May 8 14:08:44 2024 -0600 feat: collect and serve pre-agg bytes and count * pre-aggregate bytes and count per stream in the pattern ingester * serve bytes_over_time and count_over_time queries from the patterns endpoint

kavirajk added 3 commits June 3, 2024 10:28

chore(canary): Add support for cacheTest

83616f7

Add new test to check correctness of queries with and without cache. Currently only for `Count_over_time` instant metric query Signed-off-by: Kaviraj <[email protected]>

fix the cli flags

0bad897

Signed-off-by: Kaviraj <[email protected]>

Add metric for total count

10b64c2

Signed-off-by: Kaviraj <[email protected]>

kavirajk requested a review from a team as a code owner June 3, 2024 09:41

pull-request-size bot added the size/L label Jun 3, 2024

fix failing test

6eee6c7

Signed-off-by: Kaviraj <[email protected]>

MichelHollands approved these changes Jun 3, 2024

View reviewed changes

kavirajk added 4 commits June 3, 2024 15:32

wait to make query request till logs are available

b84abad

Signed-off-by: Kaviraj <[email protected]>

update correct waiting time strategy

8212e0c

Signed-off-by: Kaviraj <[email protected]>

Add log line if the diff is found

c208edf

Signed-off-by: Kaviraj <[email protected]>

add missing newline and PR remarks

1cd5110

Signed-off-by: Kaviraj <[email protected]>

kavirajk merged commit 71507a2 into main Jun 3, 2024
59 checks passed

kavirajk deleted the kavirajk/canary-with-cache-check branch June 3, 2024 16:18

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feat(canary): Add test to check query results with and without cache. #13104

feat(canary): Add test to check query results with and without cache. #13104

kavirajk commented Jun 3, 2024

MichelHollands left a comment

MichelHollands Jun 3, 2024

MichelHollands Jun 3, 2024

MichelHollands Jun 3, 2024

MichelHollands Jun 3, 2024

kavirajk commented Jun 3, 2024

kavirajk commented Jun 3, 2024

	cacheTestQueryNow := flag.Duration("cache-test-now", 1*time.Hour, "duration how far back from current time the execustion time (--now) should be set for running this query in the cache test instant-query.")
	cacheTestQueryNow := flag.Duration("cache-test-now", 1*time.Hour, "duration how far back from current time the execution time (--now) should be set for running this query in the cache test instant-query.")

	// how far back from current time the execustion time (--now) should be set for running this query.
	// how far back from current time the execution time (--now) should be set for running this query.

feat(canary): Add test to check query results with and without cache. #13104

feat(canary): Add test to check query results with and without cache. #13104

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