[jira] [Commented] (ARROW-12826) [R] [CI] Add caching to revdepchecks

["Neal Richardson (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17623336#comment-17623336 ] 

Neal Richardson commented on ARROW-12826:
-----------------------------------------

Still valid [~assignUser]?

> [R] [CI] Add caching to revdepchecks
> ------------------------------------
>
>                 Key: ARROW-12826
>                 URL: https://issues.apache.org/jira/browse/ARROW-12826
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Continuous Integration, R
>            Reporter: Jonathan Keane
>            Priority: Major
>
> With ARROW-12569 we added a (manual) reverse dependency check job. This runs fine (if slow) for a one-off run. It should be possible to cache between runs. There are a few issues with this currently:
> * {revdepcheck} does not (yet) [support only running new runs|https://github.com/r-lib/revdepcheck/issues/94]
> * The cache doesn't cache some of the longest running tasks (installing the reverse dependencies)
> * If we cache the revdeps directory, we will need to re-add packages that should be re-checked.
> We should investigate contributing to revdepcheck to resolve the run-only-new and possibly also add features for cacheing the installations (and only change when the crancache is invalidated / finds a new package?) https://github.com/HenrikBengtsson/revdepcheck.extras might also be helpful
> For posterity, the following is ~what we would need to add to dev/tasks/r/github.linux.revdepcheck.yml
> ```
>       - name: Cache crancache and revdeps directory
>         uses: actions/cache@v2
>         with:
>           key: {{ "r-revdep-cache-${{ some-way-to-get-arrow-version }}" }}
>           path: |
>             arrow/r/revdep
>             arrow/.crancache
> ```



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