This bug was fixed in the package livecd-rootfs - 2.578.8
---------------
livecd-rootfs (2.578.8) disco; urgency=medium
* ubuntu-cpc: Only produce explicitly specified artifacts (LP:
#1837254)
-- Robert C Jennings <robert.jenni...@canonical.com> Mon, 26 Aug 2019
16:25:24 -0500
** Changed in: livecd-rootfs (Ubuntu Disco)
Status: Fix Committed => Fix Released
** Changed in: livecd-rootfs (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1837254
Title:
ubuntu-cpc parallel builds produce unused files
Status in livecd-rootfs package in Ubuntu:
Fix Released
Status in livecd-rootfs source package in Xenial:
Fix Released
Status in livecd-rootfs source package in Bionic:
Fix Released
Status in livecd-rootfs source package in Disco:
Fix Released
Bug description:
[Impact]
In parallel builds where a list of image targets are provided, the build
may produce binaries that are not part of the named set of targets but
are created by series dependencies. These implicitly created binaries
may be generated by multiple builds but are unused as our convention for
the ubuntu-cpc project is to only consume binaries from the explicitly
named image targets; this avoids overwriting the same object by multiple
parallel builds. The problem is that as we build out parallel jobs for
a number of image targets (multiplied by each supported architecture)
we're wasting a lot of resources.
[Test Case]
* Specify an image target within the ubuntu-cpc project for a build
* Observe artifacts in addition to the ones for the named image
target are produced and downloaded
[Regression Potential]
* An artifact from an explicitly named artifact is missing and builds
will begin to remove desired output. Testing is being done to address
this regression.
[Other Info]
* This has been running in production in Eoan for a few weeks and
we're satisfied with the results. We have seen overall time reduced
by 20-50% on some builds.
[Original Description]
In parallel builds where a list of image targets are provided, the build
may produce binaries that are not part of the named set of targets but
are created by series dependencies. These implicitly created binaries
may be generated by multiple builds but are unused as our convention for
the ubuntu-cpc project is to only consume binaries from the explicitly
named image targets; this avoids overwriting the same object by multiple
parallel builds. The problem is that as we build out parallel jobs for
a number of image targets (multiplied by each supported architecture)
we're wasting a lot of resources.
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https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1837254/+subscriptions
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