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https://issues.apache.org/jira/browse/CASSANDRA-21547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18101131#comment-18101131
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Michael Semb Wever edited comment on CASSANDRA-21547 at 8/2/26 7:21 PM:
------------------------------------------------------------------------
patch:
https://github.com/apache/cassandra/compare/cassandra-5.0...thelastpickle:cassandra:mck/cassandra-ubuntu-test-size-reduce/5.0
takes cassandra-ubuntu-test down to 10.7GB
was (Author: michaelsembwever):
patch:
https://github.com/apache/cassandra/compare/cassandra-5.0...thelastpickle:cassandra:mck/cassandra-ubuntu-test-size-reduce/5.0
> CI: reduce build and test docker image sizes using multi-stage builds
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-21547
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21547
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: CI
> Reporter: Michael Semb Wever
> Assignee: Michael Semb Wever
> Priority: Normal
> Fix For: 5.0.x, 7.x, 6.0.x
>
>
> cassandra-ubuntu-test is currently 37GB and slows the CI pipeline down a lot.
> Background: CASSANDRA-21541 and CASSANDRA-21523
> Do the following (to all the dockerfiles) to reduce the docker image sizes.
> 1) Use multi-stages in dockerfiles (to avoid accumulating layer sizes)
> Restructure cassandra-ubuntu-test (only) into three stages:
> - *base* - all system setup (apt packages, JDKs, python, locales,
> alternatives, java.security edits and the cassandra-tmp build user), written
> once.
> - *builder* - derives from base and does the throw-away heavy work:
> prepopulate the Maven cache and build the five python virtualenvs and the ccm
> repository.
> - *final* - re-derives from the clean base and only COPY --from=builder
> the generated caches (/home/cassandra and /home/image-cache).
> 2) Clean apt caches in-layer in same RUN layer
> 3) Fold venv chmod/cleanup into same RUN layers
> Each Python virtualenv was built in one layer, then a later `RUN chmod -R
> og+wx` and `RUN rm` touched the whole tree in separate layers. Under overlay2
> a chmod copy-up rewrites every touched file into the new layer while the
> originals still occupy the earlier layer, so the ~2GB of virtualenvs were
> effectively stored twice; the separate `rm` of the cassandra-driver .git dirs
> reclaimed nothing. Consolidate each env's virtualenv creation, pip install,
> cassandra-driver/.git removal and og+wx chmod into a single RUN so the tree
> exists in exactly one layer with the correct permissions. No functional
> change: same tools, versions and permissions.
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