[jira] Commented: (MNG-3379) Parallel resolution of artifacts

["Don Brown (JIRA)" <ji...@codehaus.org>]

    [ http://jira.codehaus.org/browse/MNG-3379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=142449#action_142449 ] 

Don Brown commented on MNG-3379:
--------------------------------

I recreated the MNG-3379 branch but without the wagon changes.  I also improved the console monitor so it now properly handles multiple files being retrieved simultaneously.  What more needs to be done before the changes are moved into the 2.0.x branch?

> Parallel resolution of artifacts
> --------------------------------
>
>                 Key: MNG-3379
>                 URL: http://jira.codehaus.org/browse/MNG-3379
>             Project: Maven 2
>          Issue Type: New Feature
>          Components: Artifacts and Repositories
>    Affects Versions: 2.0.8
>            Reporter: Don Brown
>            Assignee: Brett Porter
>             Fix For: 2.1
>
>         Attachments: parallel-resolution-2.diff, parallel-resolution-3.diff, parallel-resolution.diff
>
>
> Artifacts should be resolved in parallel, grouped by group id's to get around the lack of synchronization in the local repository.  The patch does the following:
> * Use a ThreadPoolExecutor to parallelize artifact resolution, but takes care not to resolve multiple artifacts from the same group id simultaneously. (requires Java 5)
> * Makes the http wagon the default instead of the poor performing http-client
> Disadvantages: 
> * Requires Java 5, but the backport jars could be substituted pretty easily
> * Breaks some plugins due to commons-logging being in the Maven uber jar (required by commons-httpclient), notably the apt plugin (maybe more should use the isolatedRealm setting?)
> * Screws up the progress monitor as multiple threads are updating it
> Advantages:
> * Much faster when combined with the http wagon (WAGON-98).  I was seeing 40% improvement on some test builds.

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