Enforce "max chunks per query" limit in ingesters too#4125
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pracucci merged 4 commits intocortexproject:masterfrom Apr 28, 2021
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Can you please rebase against master to pull in #4137 and move the changelog entry to the top? |
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Good job, nothing to complain about. :)
pkg/distributor/query.go
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total? :) if you shorten both (chunksLimit, chunksCount) they will align nicely, and are expressive enough.
pkg/util/labels_test.go
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Test with __name__ label name would show that no special handling of that name is done.
…ier.max-fetched-chunks-per-query which is applied both to ingesters and long-term storage Signed-off-by: Marco Pracucci <marco@pracucci.com>
Signed-off-by: Marco Pracucci <marco@pracucci.com>
Signed-off-by: Marco Pracucci <marco@pracucci.com>
Signed-off-by: Marco Pracucci <marco@pracucci.com>
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Thanks @pstibrany, I've addressed your feedback! |
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What this PR does:
The
-store.query-chunk-limitis only enforced in the long-term storage (but not ingesters). However, there are cases where this limit can actually be hit just querying ingesters, so I would like to apply the limit when fetching chunks from ingesters too.However, if we extend
-store.query-chunk-limitto apply to ingesters too, that could be considered a breaking change, so in this PR I'm proposing to deprecate-store.query-chunk-limitin favour of a new config option-querier.max-fetched-chunks-per-query, whose limit is applied both to ingesters and long-term storage.Due to how the querying works in Cortex (ingesters and long-terms storage are queried separately) in this PR I'm proposing to keep it simple and apply the limit independently to ingesters and storage. This means that the total number of actual fetched chunks could be 2x the limit, being independently applied when querying ingesters and long-term storage. If accepted, this is something we may get back and eventually improve (in my opinion having the limit applied to ingesters too is better than having a true global limit, considering ingesters are currently unbounded, but I'm open to feedback).
Which issue(s) this PR fixes:
N/A
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]