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Clarify that Broker caching for groupBy v2 queries does not work#11370

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sthetland merged 3 commits into
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FrankChen021:groupv2_cache
Aug 3, 2021
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Clarify that Broker caching for groupBy v2 queries does not work#11370
sthetland merged 3 commits into
apache:masterfrom
FrankChen021:groupv2_cache

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@FrankChen021

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Description

Broker caching has been disabled for groupBy v2 queries since #3950, and this limitation is stated under the section Differences between v1 and v2 of groupBy query doc. But since that's a large block of text, it's not intuitive for users to notice this constraint.

This PR adds a note under the section Broker Caching of the configuration doc to give users a more clear hint when they follow that doc to enable broker caching.

This PR has:

  • been self-reviewed.

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Good idea to make this more prominent. Just one suggestion to put the groupBy term into its usual form.

Comment thread docs/configuration/index.md Outdated
@FrankChen021
FrankChen021 requested a review from sthetland July 2, 2021 02:09
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is groupBy v2 only not cacheable for the non-result cache or is it also not cacheable for result cache? If it is only for non-result cache, I think we should explicitly call that out to not confuse people.

@FrankChen021

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@capistrant Both of per-segment caching and whole-query caching are not supported for groupBy v2 queries. It's a good idea to put this in the doc to make it more clear.

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LGTM. the trick will be for someone to remember to remove this from the docs if down the road some day someone implements broker caching for groupby v2

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Hi @sthetland , Do you have any other comments ?

@sthetland
sthetland merged commit 55a01a0 into apache:master Aug 3, 2021
@clintropolis clintropolis added this to the 0.22.0 milestone Aug 12, 2021
@FrankChen021
FrankChen021 deleted the groupv2_cache branch August 13, 2021 04:00
riovic918data pushed a commit to riovic918data/druid that referenced this pull request Jun 12, 2026
…che#11370)

* Add a note

* Update docs/configuration/index.md

Co-authored-by: sthetland <[email protected]>

* clarify that both of non-result level cache and result level cache are not supported

Co-authored-by: sthetland <[email protected]>
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4 participants