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https://issues.apache.org/jira/browse/MNG-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288075#comment-17288075
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Tamás Cservenák commented on MNG-7097:
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So there's more to it: I found nice explanation WHY all this sub-optimal
(download more than really needed) things happen in MNG-5783. It seems there
are plugins using {{$\{plugin.artifacts\}}} to set up their classpath
circumventing Maven...
> Plugin Dependency Resolution: don't download Maven-provided artifacts
> ---------------------------------------------------------------------
>
> Key: MNG-7097
> URL: https://issues.apache.org/jira/browse/MNG-7097
> Project: Maven
> Issue Type: Task
> Components: Performance, Plugins and Lifecycle
> Reporter: Tamás Cservenák
> Assignee: Tamás Cservenák
> Priority: Major
>
> Current Maven behavior for resolving plugin dependencies is to download full
> transitive graph of plugin dependency, but for executing plugin it filters
> out core artifacts from graph (excludes them).
> This results in unnecessary downloads of core artifacts, multiplied by
> multiple versions used by different plugins, and local repository end up
> having artifacts that may even surprise users.
> Most notable examples: maven-core (user: "Why did Maven download maven-core-X
> when I use maven-Y?"), plexus-container-default (user: "Why does Maven
> download 10+ versions of this legacy artifact (adv user: when
> sisu-inject-plexus shim is used instead)?"), multiple versions of
> plexus-utils etc...
> We need to investigate what exactly happens with downloaded, but unused core
> artifacts (if they are completely excluded based on GAV, we are safest), and
> simply exclude them even from resolution/collection, as they are really not
> needed.
> This will not "improve build speed", but does lessen "bandwidth", as
> experiments shows that cutting plugin dependencies for core artifacts for
> Maven project itself makes about 1k less remote requests (artifact and
> artifact checksum downloads).
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