[
https://issues.apache.org/jira/browse/MNG-6311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16701138#comment-16701138
]
Mickael Istria commented on MNG-6311:
-------------------------------------
I'm also quite surprised that despite the concerns raised by [~fbricon] in
October, no further verification nor investigation has happened on this patch
and it was released 13 days later in 3.6.0, basically ignoring adopter's
concerns. It seems to me that this is a major failure in term of QE. The fact
that the issue was missed can happen, but ignoring feedback from an adopter
project that is delivered to 6 million users obviously leads to bad results,
such as 3.6.0 containing a regression over 3.5.3 and not being usable for
downstream projects.
> Maven intolerably slow when import scope used heavily in large project
> ----------------------------------------------------------------------
>
> Key: MNG-6311
> URL: https://issues.apache.org/jira/browse/MNG-6311
> Project: Maven
> Issue Type: Bug
> Components: core, Performance
> Affects Versions: 3.5.0, 3.5.2
> Reporter: David Churcher
> Assignee: Sylwester Lachiewicz
> Priority: Major
> Labels: performance
> Fix For: 3.6.0
>
> Attachments: Call-tree-–-All-threads-together.html,
> anon-hierarchy-maven-output.zip, modelcachefix.diff
>
>
> I have a build performance problem that is identical to MNG-5312, and has
> appeared since MNG-6030 in Maven v3.5.0 reversed the patch for MNG-5312,
> removing the ModelCache from some of the overloads for
> DefaultProjectBuilder.build.
> As in MNG-5312 the problem is in a large proprietary project. It uses up to 8
> levels of parent POMs, many of which use the import scope and have large
> dependency-management sections, and has hundreds of dependencies that also
> use the same parent POM hierarchy. Adding some logging shows that Maven does
> over 800,000 uncached reads of parent POM files, which takes about half an
> hour. With model caching this goes down to a few seconds.
> I've attached a patch that fixes this by using a class-level ModelCache in
> DefaultProjectBuilder. This does not suffer from the memory usage problems
> reported in MNG-6030.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
