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https://jira.codehaus.org/browse/MNG-5669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=354586#comment-354586
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Igor Fedorenko commented on MNG-5669:
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Related regression reported against maven 3.2.3
http://mail-archives.apache.org/mod_mbox/maven-dev/201410.mbox/browser
> same pom.xml is read multiple times
> -----------------------------------
>
> Key: MNG-5669
> URL: https://jira.codehaus.org/browse/MNG-5669
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.2.3
> Reporter: Igor Fedorenko
>
> The same parent pom.xml is read multiple times during single
> ProjectBuilder#build invocation. This is a performance regression introduced
> in 3.2.3-SNAPSHOT. I do not know how much this affects real-world build
> performance.
> ~~~~~
> ProjectBuilder#build(File,ModelSource,...) first constructs project model then
> initializes MavenProject instance.
> When project model is constructed, all local and remote parent pom.xml files
> are read and stored in model cache during ModelBuilder#readParent. The cache
> uses GAV keys. Only parent models are stored in the cache. The model of the
> project being being is not cached.
> When MavenProject instance is initialized, ProjectBuilder#build is called
> recursively to create parent MavenProject instances.
> There are appears to be two problems
> * ModelCache used to create original project Model is not passed to the
> recursive ProjectBuilder#build invocation.
> * ProjectBuilder#build does not use ModelCache for the project being built.
> During recursive invocation, this means the cache is never used to load
> parent pom.xml models cached during outer ProjectBuilder#build invocation.
> The solution is to introduce additional short-lived model cached keyed by
> pom.xml file location (project GAV is not known when ProjectBuilder#build is
> called). Alternatively, introduce ProjectBuilder#buildParent that will use
> the model cache.
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