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https://jira.codehaus.org/browse/MNG-5312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason van Zyl reopened MNG-5312:
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> MavenProject.getParent intolerably slow when import scope used heavily
> ----------------------------------------------------------------------
>
> Key: MNG-5312
> URL: https://jira.codehaus.org/browse/MNG-5312
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Embedding
> Affects Versions: 3.0.4
> Environment: JDK 7, Ubuntu
> Reporter: Jesse Glick
> Assignee: Jason van Zyl
> Fix For: 3.0.5
>
> Attachments: DefaultProjectBuilder.diff
>
>
> For projects which make heavy use of {{<scope>import</scope>}} including in
> parent POMs, calling {{MavenProject.getParent}} (thus
> {{DefaultProjectBuilder.build(Artifact, ...)}}) can be intolerably slow -
> taking many minutes - even when loading the project (or its parent) via
> {{DefaultProjectBuilder.build(List<File>, ...)}} takes less than a second.
> The discrepancy seems to be due to the fact that {{ReactorModelCache}} is
> crucial for the performance of
> {{DefaultModelBuilder.importDependencyManagement}}, yet only one
> {{DefaultProjectBuilder.build}} overload defines a {{ModelCache}}. For
> resolution of parents from a single POM, no model cache is likely to be
> needed under normal circumstances, but if you are missing a cache when import
> scope dependencies are processed for {{<dependencyManagement>}}, the builder
> takes exponential time to find these imports.
> I do not have a minimal test case for this yet as the known test case
> involves a large and complex proprietary source base. Patch (baseline is
> 3.0.4) successfully tested against these sources and shown to reduce
> {{getParent}} times by orders of magnitude.
> https://issues.jenkins-ci.org/browse/JENKINS-11362 is the downstream issue
> describing symptoms.
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