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http://jira.codehaus.org/browse/MNG-3004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=168455#action_168455
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Hans-Peter Störr commented on MNG-3004:
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Good point. But I am not sure that locking is a good way to do this - locking
has its dangers.
Perhaps it is possible to make parallel updates harmless. Such as downoading
the files under a different name and renaming it to the right name only
afterwards.
For the parallel build however I would suggest a two phase strategy:
1. Update and download all needed dependencies and plugins. (Singlethreaded,
perhaps except for the actual downloads.)
2. Execute a parallel build without any updates / downloads
Perhaps a singlethreaded mvn validate and then a parallel build with maven in
offline mode would do this?
I've heard hudson already does parallel builds with maven. Anyone knows how
they handle this problem?
> Allow build lifecycle to execute tasks in parallel
> --------------------------------------------------
>
> Key: MNG-3004
> URL: http://jira.codehaus.org/browse/MNG-3004
> Project: Maven 2
> Issue Type: Improvement
> Components: Bootstrap & Build, General, Performance
> Affects Versions: 2.0.6
> Reporter: Nigel Magnay
> Fix For: 2.2.0-M1
>
> Attachments: parallel-builds.patch
>
>
> One of the great advantages with maven over scripted build environments is
> that it can calculate the dependencies of the build, and it could execute
> items that are independent of each other in parallel.
> Unfortunately it currently doesn't do this, which would be a big win over
> tools such as 'ant'. It also means that multicore machines have lots of idle
> capacity when running a serial build that could be utilised.
> I had a quick shot at seeing what might be required. Bear in mind this is the
> first time I have looked at maven internally, and I was just trying to feel
> my way around and build a POC. I got some of the way there, but my build
> threads don't seem to have the correct classpath - I think this is something
> to do with plexus / classworlds - but I don't know enough.
> It'd be great to get this feature in a future version, or a way of running my
> hack (figuring out why in a thread has not the plexus stuff) in the interim.
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