Michael Semb Wever created CASSANDRA-21044:
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Summary: Jenkinsfile fix parallel xz and improve jdk parsing
performance
Key: CASSANDRA-21044
URL: https://issues.apache.org/jira/browse/CASSANDRA-21044
Project: Apache Cassandra
Issue Type: Bug
Components: CI
Reporter: Michael Semb Wever
Three changes to the Jenkinsfile.
1. Some test result files were sometimes missing from the CI results artefact
tarball, and their results missing from the ci_summary.html numbers.
This was because xz compression in Jenkinsfile was being run in parallel using
backgrounded processes and the wait command, but the wait command was actually
waiting for xv completion (it was just getting lucky 99.9% of the time).
The fix is to replace the background and wait approach with xargs in parallel
mode.
2. The parsing of the build.xml to find the jdk.default and jdk.supported
values is very slow (2min+, due to jenkins peculiarities), made worse by the
jenkinsfile having to do it multiple times for calls (and asserts) in multiple
pipeline stages.
Fix was to properly declare constants, and to cache the result of the `task()`
method (since it's only ever called on the initial agent when creating the
build workflow.
3. Improve UX by logging early on (in a new "init" stage) what the user
specified build parameters are. A number of users were confused because the
job's coordinates are fixed to the base branch, and the user specified
parameters are not actually used until doing compile and test tasks within each
stage split. The console log still logs the fixed git coordinates, but now
shortly after it also prints the user's parameters. It is hoped this improves
the UX a little.
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