GWphua opened a new pull request, #19424:
URL: https://github.com/apache/druid/pull/19424
This PR updates the Docker image build to use locked BuildKit cache mounts
for the Maven local repository.
The Dockerfile already uses `RUN --mount=type=cache,target=/root/.m2` to
reuse Maven dependencies across image builds. By default, BuildKit cache mounts
are shared, which allows multiple concurrent builds to write to the same Maven
cache at the same time. Maven’s local repository is not a good fit for
concurrent writers, so parallel Docker builds can corrupt or partially write
cached artifacts.
This PR changes both Maven cache mounts to use `sharing=locked`, causing
concurrent builds that use the same `/root/.m2` cache to wait for the active
writer to finish before reusing the cache.
<hr>
##### Key changed/added classes in this PR
* `distribution/docker/Dockerfile`
<hr>
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This PR has:
- [x] been self-reviewed.
- [x] been tested in a test Druid cluster.
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