[jira] [Commented] (MNG-7097) Plugin Dependency Resolution

["Tamás Cservenák (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MNG-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17282914#comment-17282914 ] 

Tamás Cservenák commented on MNG-7097:
--------------------------------------

FTR, the "experiments" mentioned above is this:

Setup:
- am using (primed) MRM, not interested in bashing Central or measuring my ISP network speed
- am always nuking local repo (hence, starting state is "get everything needed for build")
- my test bed project is maven itself (master, ab20190a1a9fecdc8f85b40e8d03d806f3da4fc6)
- build + tests ARE executed, and succeed OK, but I was really interested in local repository post-build state
- command line am executing from maven checkout root is: {{rm -r /tmp/repo; ~/bin/maven/apache-maven-XXX/bin/mvn clean install -Dmaven.repo.local=/tmp/repo}}
mvn master (4.0.0-alpha-1, ab20190a1a9fecdc8f85b40e8d03d806f3da4fc6):
total time 1:08 min (as Maven reports)
total files in local repo: 3741
total bytes in local repo: 162428
count of files having "plexus-container-default" in local repo:  37 (18 POM, 10 JAR)

Patch [https://github.com/apache/maven/compare/master...cstamas:plugin-resolution-hack]

results with above patched mvn master:
total time 1:04 min (as Maven reports)
total files in local repo: 2992
total bytes in local repo: 149740
count of files having "plexus-container-default" in local repo: 0

> Plugin Dependency Resolution
> ----------------------------
>
>                 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
>            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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