reda-alaoui commented on PR #175:
URL:
https://github.com/apache/maven-build-cache-extension/pull/175#issuecomment-2315794689
Let me try to be more concrete by exposing a simplified example.
I have a maven project with a single module. In this module, I have many
prod classes and many slow tests in this module.
My naive CI (Jenkins) pipeline is a single step: `mvn clean verify`. Running
this takes 5 hours (30 minutes of compilation + 4h30m of test execution).
My CI can execute jobs among multiple machines. So I decide to distribute
the pipelines of my tests among my CI machines.
I split the tests in 3 groups. To assign each test a group, I annotate each
test class with a JUnit 5 `@Tag` annotation with a value of `group1`, `group2`
or `group3`.
My new pipeline is:
1. `mvn clean verify -DskipTests` (~30 minutes)
2. In parallel:
1. `mvn clean verify -Dgroups=group1` (4h30m/3)
2. `mvn clean verify -Dgroups=group2` (4h30m/3)
3. `mvn clean verify -Dgroups=group3` (4h30m/3)
I want:
* steps 2.x to reuse the cache produced by step 1 (I needed
https://github.com/apache/maven-build-cache-extension/pull/177#pullrequestreview-2262014561
to make this one totally work)
* that running again any step without any code change should skip all maven
plugin executions
> Does statement 2 imply that the rerun is a different reactor compile ->
test group 1 and the expectation is that the results of the initial run are
reused?
Yes
> Does parallel[test group 1, test group 2, test group 3] refer to three
different reactor modules running tests?
Yes
> Are compile and any of test group 1, test group 2, test group 3 parts of
the same module?
Not necessarly. You can have a test group spanning across multiple modules.
> You can move the parameter to the effective pom. One way to do this is by
using a profile that defines a literal property value and referencing that
value in a plugin. By doing so, the value will be interpolated to the plugin
parameters and become part of the effective pom.
Yes I know, and as I said I don't want a different checksum between all
those steps.
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