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fix: Memcached persistence #14049

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merged 4 commits into from
Sep 25, 2024

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AndreZiviani
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@AndreZiviani AndreZiviani commented Sep 4, 2024

What this PR does / why we need it:
Fixes the usage of persistence on Memcached:

  • Memcached must create a file smaller than disk size
  • ext_wbuf_size must be bigger than max item size and be divisible by wbuf_size which is 64 by default
  • Add pod permissions to access local volume

Which issue(s) this PR fixes:
Fixes #14028
Related #13619

Special notes for your reviewer:

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
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@AndreZiviani AndreZiviani requested a review from a team as a code owner September 4, 2024 17:42
@pull-request-size pull-request-size bot added size/M and removed size/S labels Sep 4, 2024
@github-actions github-actions bot added the type/docs Issues related to technical documentation; the Docs Squad uses this label across many repositories label Sep 4, 2024
@AndreZiviani
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hey @chaudum please review this when you can

@pentago
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pentago commented Sep 20, 2024

why is this taking ages to merge?

@eric-engberg
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I don't think ext_wbuf_size should be hard coded. Users should be able to adjust this if needed

@AndreZiviani
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I agree @eric-engberg but I could not think of a way to:

  • make it configurable by the user if needed
  • automatically add required options for persistency

any suggestions on how to do it?

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@chaudum chaudum left a comment

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@AndreZiviani Thanks! LGMT
I will merge once the merge conflicts are resolved.

@AndreZiviani
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thanks @chaudum , done

@eric-engberg
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I agree @eric-engberg but I could not think of a way to:

  • make it configurable by the user if needed
  • automatically add required options for persistency

any suggestions on how to do it?

Just add it as a field in the values file. Under persistence maybe?

@chaudum
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chaudum commented Sep 24, 2024

I agree @eric-engberg but I could not think of a way to:

  • make it configurable by the user if needed
  • automatically add required options for persistency

any suggestions on how to do it?

Just add it as a field in the values file. Under persistence maybe?

@eric-engberg Do you want to do that in a separate PR?

@AndreZiviani
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since this is a somewhat complex and advanced usage I believe we shouldn't add any options automatically (I had some issued with this on loki-distributed helm), I've added it on previous PR because it looked like it was going to be simple but it is not

@chaudum
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chaudum commented Sep 25, 2024

@AndreZiviani Seems like the branch needs to be updated again to resolve the conflicts. I'm ready to merge then.

@AndreZiviani
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@chaudum done

@AndreZiviani
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also looks like the CI for helm release is broken
#14258

@chaudum chaudum merged commit ee6e1cf into grafana:main Sep 25, 2024
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chaudum commented Sep 25, 2024

Thanks @AndreZiviani !

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LashaJini pushed a commit to LashaJini/loki that referenced this pull request Sep 26, 2024
* Memcached must create a file smaller than disk size
* `ext_wbuf_size` must be bigger than max item size and be divisible by `wbuf_size` which is 64 by default
* Add pod permissions to access local volume
jeschkies pushed a commit to jeschkies/loki that referenced this pull request Oct 1, 2024
* Memcached must create a file smaller than disk size
* `ext_wbuf_size` must be bigger than max item size and be divisible by `wbuf_size` which is 64 by default
* Add pod permissions to access local volume
mraboosk pushed a commit to mraboosk/loki that referenced this pull request Oct 7, 2024
* Memcached must create a file smaller than disk size
* `ext_wbuf_size` must be bigger than max item size and be divisible by `wbuf_size` which is 64 by default
* Add pod permissions to access local volume
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Helm: persistent cache item_size_max: 5242880 cannot be larger than ext_wbuf_size: 4194304
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