David Churcher created MNG-6311:
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Summary: 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: 3.5.2, 3.5.0
Reporter: David Churcher
Attachments: 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.
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